CVE-2026-116094: EyouCMS SSRF
TL;DR - CVE-2026-116094 is a high-severity SSRF vulnerability in EyouCMS through version 1.8.3. - Internet-facing EyouCMS installations may allow attackers to induce server-side requests through
remote_file_to_local. - A public disclosure exists, but exploitation in the wild is not confirmed and no fixed vendor version was identified. - Until a verified fix is available, restrict the affected functionality and enforce strict outbound network controls.
Vulnerability at a Glance
| Field | Details |
|---|---|
| CVE ID | CVE-2026-116094 |
| Product | EyouCMS |
| Vulnerability | Server-side request forgery (SSRF) |
| CVSS | 7.3 High |
| Attack vector | Network / remote |
| Authentication required | Unknown; the available NVD record does not provide the CVSS vector or confirm authentication requirements |
| Affected versions | EyouCMS through and including 1.8.3 |
| Vulnerable component | application/function.php, function remote_file_to_local |
| Patch available | No confirmed vendor patch identified |
| Public disclosure | Yes |
| Confirmed active exploitation | Not confirmed |
| CISA KEV status | Not listed |
CVE-2026-116094 affects a file-fetching function that can cause the EyouCMS server to make outbound requests. A successful SSRF attack may expose internal services that are not directly reachable from the internet, depending on network placement and egress controls.
For background on vulnerability scoring, see what the difference between CVE and CVSS means.
The available record provides a CVSS base score of 7.3 but does not include the underlying vector. Defenders should not infer unconfirmed details such as authentication requirements, data confidentiality impact, or whether arbitrary response bodies are returned. Treat internet-facing deployments as exposed until the affected functionality has been disabled, constrained, or verified as fixed.
Analyst’s Take: The immediate priority is exposure reduction, not waiting for a complete exploit description. Public disclosure and remote reachability justify restricting the file-fetching function and outbound access on internet-facing systems, while the missing CVSS vector and unconfirmed exploitation status should limit claims about impact rather than delay those controls.
What Is This Vulnerability?
The issue is reported in EyouCMS’s remote_file_to_local function in application/function.php. The function appears to support retrieving a remote file and storing it locally. According to the public disclosure title, the problem is missing SSRF validation in this function, resulting in frontend SSRF.
An attacker may be able to influence the destination URL supplied to the server. Instead of retrieving only an approved public resource, the EyouCMS host may connect to an attacker-selected address. Potential targets include localhost services, RFC1918 private addresses, link-local systems, cloud metadata endpoints, internal administration panels, and other hosts accessible from the CMS network.
The available materials do not establish the exact request format, whether redirects are followed, which URL schemes are accepted, or whether the attacker can read the complete response. Validate those details in an isolated test environment using the linked disclosure and the deployed source code. Do not assume them when building detections or assessing exploit impact.
SSRF risk is strongly influenced by deployment architecture. A CMS host with unrestricted outbound access and access to sensitive management networks presents substantially greater risk than one isolated behind egress filtering. Network controls reduce impact but do not remove the application defect.
Who Is Affected?
The NVD record identifies EyouCMS versions up to and including 1.8.3 as affected. The record does not provide a minimum affected version, so the complete lower bound is unknown. Inventory all EyouCMS installations at version 1.8.3 or earlier and treat them as potentially vulnerable.
The vulnerable code is specifically associated with:
- Product: EyouCMS
- Version range: through and including 1.8.3
- File:
application/function.php - Function:
remote_file_to_local
A public GitHub disclosure references EyouCMS 1.8.2, which is consistent with the reported affected range. That reference is not a complete product version matrix. Forks, vendor-modified packages, bundled applications, and locally altered source trees may not match upstream behavior.
To identify potentially affected systems, combine package or source inspection with asset inventory. Search deployed application trees for the affected function and confirm the installed release rather than relying only on banners or web fingerprints:
find /var/www /srv/www -type f -path '*/application/function.php' \\
-print 2>/dev/null
grep -RIn --include='function.php' \\
'remote_file_to_local' /var/www /srv/www 2>/dev/null
These commands identify likely code locations but do not prove exploitability or patch status. Consider a deployment affected unless a vendor-issued fixed release is obtained and the relevant function is verified.
CVSS Score Breakdown
CVE-2026-116094 has an NVD-reported CVSS base score of 7.3, High. The record describes the vulnerability as remotely exploitable, which supports the conclusion that the attack surface is network reachable. The score indicates material security impact, but the supplied record does not include the CVSS vector string.
Without the vector, the individual metrics cannot be stated reliably. The available data does not confirm:
- Whether no authentication is required
- Whether user interaction is required
- Whether the vulnerable request is handled over HTTP or another protocol
- Whether confidentiality, integrity, and availability impacts are low or high
- Whether the attack complexity is low
Use 7.3 as the published severity rating, not as evidence for unreported technical properties. Assess local exposure using the actual deployment: internet accessibility, authentication controls, outbound firewall policy, access to internal services, and the sensitivity of reachable destinations.
Internet-facing EyouCMS instances should receive prompt attention because the vulnerability is remotely reachable and has a public disclosure. Internal-only installations still warrant remediation where untrusted users can submit content or invoke file retrieval behavior.
Exploitation Status
Public disclosure: confirmed. The NVD record states that the exploit has been publicly disclosed and may be utilized. A GitHub security-research repository linked from the CVE record documents an EyouCMS SSRF issue and references EyouCMS 1.8.2. The available retrieved material does not establish a complete, independently validated exploit procedure.
Confirmed exploitation in the wild: not established. CVE-2026-116094 is not currently listed in the CISA Known Exploited Vulnerabilities catalog. There is no CISA date added, remediation due date, ransomware flag, or required action associated with this CVE in the supplied information.
A public disclosure lowers the barrier to research and exploitation, but it is not proof that attacks are occurring. Organizations should still prioritize exposed systems because SSRF can provide access to network locations that perimeter monitoring may not cover. Absence from KEV is not a safety signal or evidence that exploitation is impossible.
How to Detect CVE-2026-116094
Detection should focus on two related signals: inbound requests that invoke EyouCMS functionality capable of remote file retrieval, and outbound connections from the CMS server to destinations outside its normal operating profile. Correlate application and reverse-proxy logs with firewall, DNS, and cloud-flow telemetry.
Look for requests containing parameters or routes associated with remote file retrieval, encoded URLs, loopback targets, private address space, link-local addresses, and unusual schemes. The exact endpoint and parameter names are not confirmed in the available record, so detections should avoid assuming a single URL pattern. Search the application source and normal traffic first, then tune rules to the deployment.
Example investigation searches:
# Search common web and application logs for the affected function name
grep -RInE 'remote_file_to_local|localhost|127\\.0\\.0\\.1|169\\.254\\.169\\.254' \\
/var/log/nginx /var/log/apache2 /var/log/httpd /var/log 2>/dev/null
# Search for private, loopback, and link-local address targets in HTTP logs
grep -RInE '(/|%2f)(127\\.0\\.0\\.1|localhost|10\\.[0-9]+\\.[0-9]+\\.[0-9]+|\\
172\\.(1[6-9]|2[0-9]|3[0-1])\\.[0-9]+\\.[0-9]+|192\\.168\\.[0-9]+\\.[0-9]+|\\
169\\.254\\.[0-9]+\\.[0-9]+)' /var/log/nginx /var/log/apache2 2>/dev/null
The wrapped regular expression is illustrative and should be adapted to the local log format. URL encoding, decimal IP notation, IPv6, redirects, DNS rebinding, and alternate hostname representations can bypass simplistic string matching. Network telemetry remains essential.
Technical Detection Notes
A practical detection query for an Elasticsearch-style HTTP access log might be:
url.original:(*remote_file_to_local* OR *169.254.169.254* OR *127.0.0.1* OR
*localhost* OR *10.* OR *192.168.* OR *172.16.* OR *172.17.* OR
*172.18.* OR *172.19.* OR *172.2* OR *172.30.* OR *172.31.*)
OR destination.ip:(127.0.0.0/8 OR 169.254.0.0/16 OR 10.0.0.0/8 OR
172.16.0.0/12 OR 192.168.0.0/16)
Validate the query syntax and CIDR behavior for the organization’s SIEM. Alert when a web or PHP process initiates outbound connections to internal address ranges, cloud metadata addresses, or administrative ports. An isolated, expected integration may generate similar traffic, so enrich alerts with process identity, destination history, DNS resolution, request path, authenticated user, and response status.
Mitigation and Patching
No confirmed vendor-issued fixed version was identified in the available references. The affected range is therefore through EyouCMS 1.8.3, and no specific upgrade-to version can responsibly be provided. Do not assume that a later-looking package, fork, or unofficial download contains the fix without verifying a vendor advisory, release notes, and the implementation of remote_file_to_local.
Until a verified fix exists, restrict or disable the affected remote-file functionality where possible. The strongest compensating control is outbound network enforcement at the host or network boundary. Permit only destinations required for normal business operations, and explicitly deny loopback, RFC1918, link-local, metadata, and internal management networks.
Organizations using broader identity and access controls can also review their exposure with this guide to the best identity and access management platforms in 2026.
Technical Mitigation Notes
Example Linux firewall rules can block common SSRF destinations at the host boundary. Test carefully, because these rules may disrupt legitimate application behavior:
# Example IPv4 egress blocks; adapt interface, policy, and change controls.
sudo iptables -A OUTPUT -d 127.0.0.0/8 -j REJECT
sudo iptables -A OUTPUT -d 10.0.0.0/8 -j REJECT
sudo iptables -A OUTPUT -d 172.16.0.0/12 -j REJECT
sudo iptables -A OUTPUT -d 192.168.0.0/16 -j REJECT
sudo iptables -A OUTPUT -d 169.254.0.0/16 -j REJECT
If EyouCMS must retrieve external files, use an outbound proxy with an allowlist rather than unrestricted direct egress. The proxy should validate the resolved destination, block redirects to prohibited networks, restrict schemes to HTTPS where feasible, and prevent DNS rebinding. Application-level validation should reject loopback, private, link-local, multicast, and reserved addresses after DNS resolution and on every redirect.
For source-level emergency mitigation, administrators should not edit production code without testing and a rollback plan. A defensible temporary approach is to disable the route or feature that invokes remote_file_to_local, or to replace remote fetching with an allowlisted service. After an official fix is published, upgrade using the vendor’s documented procedure, then verify the deployed source and restart the relevant application services. Because no official fixed version or command is available in the supplied references, an exact EyouCMS upgrade command cannot be stated without inventing vendor-specific details.
After remediation, test that requests to prohibited destinations are rejected, that redirects cannot bypass validation, and that the server no longer makes unexpected outbound connections. Review historical outbound traffic and application logs for signs of prior access to metadata services, internal panels, or unusual external hosts.
Response and Recovery Checklist
If you operate an affected EyouCMS installation:
- Identify every instance running version 1.8.3 or earlier.
- Determine whether the CMS is internet-facing and whether untrusted users can reach file-retrieval functionality.
- Restrict or disable
remote_file_to_localwhere operationally possible. - Block outbound connections to loopback, private, link-local, metadata, and management networks.
- Route required external downloads through an allowlisted proxy.
- Search web, application, DNS, firewall, and cloud-flow logs for suspicious destinations.
- Review whether the CMS host could access credentials, metadata services, internal control planes, or administrative interfaces.
- Monitor the EyouCMS project and vulnerability databases for a verified vendor fix.
- Upgrade only after confirming the corrected implementation and release provenance.
- Retest SSRF protections and document the final controls.
If investigation identifies suspicious access, preserve relevant logs and system images before making significant changes. Rotate credentials or tokens that may have been accessible from the affected host, especially cloud instance credentials and internal service secrets.
References
The NVD record and associated references provide the primary basis for the affected version, vulnerable function, severity, and disclosure status:
- Public GitHub security disclosure — documents the reported missing SSRF validation in
remote_file_to_local. - VulDB CVE page — secondary vulnerability record.
- VulDB submission reference — associated submission record.
- VulDB vulnerability entry — associated vulnerability entry.
- VulDB CTI entry — associated threat-intelligence entry.
The available references do not identify a confirmed fixed release, a complete CVSS vector, exact authentication requirements, or confirmed exploitation in the wild. Organizations should track the EyouCMS project and relevant vulnerability databases for a vendor advisory or corrected release while maintaining the compensating controls described above.
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