CVE-2026-102455: Digiwin EasyFlow RCE
TL;DR - CVE-2026-102455 is a critical, unauthenticated arbitrary-code-execution flaw in Digiwin EasyFlow .NET. - The exact affected range and fixed version are not confirmed. - Restrict exposure and investigate internet-facing systems while obtaining vendor remediation details.
Summary
CVE-2026-102455 affects Digiwin EasyFlow .NET. The NVD description identifies an insecure deserialization vulnerability that allows an unauthenticated remote attacker to submit maliciously crafted serialized content and execute arbitrary code on the server. NVD published the CVE on September 30, 2026, at 09:17:13 UTC.
| Field | Assessment |
|---|---|
| CVE ID | CVE-2026-102455 |
| Product | Digiwin EasyFlow .NET |
| Vulnerability | Insecure deserialization |
| CVSS v3 base score | 9.8, Critical |
| Attack vector | Network-reachable remote attack, based on the NVD description; the official CVSS vector was not returned and must be confirmed |
| Authentication required | None, according to the vulnerability description |
| Patch available | Not confirmed |
| Fixed version | Not identified in the retrieved NVD or TWCERT/CC material |
| CISA KEV status | Not listed at the time of research |
The operational priority is high even though several remediation details remain unavailable. An internet-facing EasyFlow .NET deployment may be reachable by an attacker without an account, and successful exploitation could provide code execution under the identity of the application service or web server process.
Administrators should not treat the absence of a confirmed fixed version as evidence that a deployment is safe. Inventory all EasyFlow .NET instances, identify which are externally reachable, restrict access where possible, and obtain the vendor’s applicable update package or release guidance.
Analyst’s Take: Exposure reduction should come before version-based patch decisions because the affected range and fixed release are still unconfirmed. Start with internet-facing instances, then use process and web telemetry to look for exploitation while obtaining guidance from Digiwin or TWCERT/CC.
Root Cause
The root cause is unsafe deserialization of attacker-controlled data. Deserialization converts serialized input into application objects or data structures. If the application accepts untrusted serialized content and processes it with an unsafe formatter or object-binding path, attacker-controlled data can influence object creation and execution flow.
The available description does not identify the specific endpoint, serialization format, framework component, or code path involved. Those details should not be inferred from the CVE alone. What is established is the security consequence: an unauthenticated remote attacker can send malicious serialized content and execute arbitrary code on the EasyFlow .NET server.
Unlike broken object-level authorization, this issue does not primarily concern access checks around individual records. It is a server-side code-execution risk caused by unsafe processing of serialized input.
The impact depends on the privileges available to the EasyFlow service account and the server’s network position. Code execution may enable data theft, web-shell deployment, credential access, lateral movement, or disruption of business workflows. These outcomes are possible consequences of server-side code execution, not confirmed actions associated with this CVE.
Technical Notes
Because the vulnerable endpoint and serialized format are not disclosed in the retrieved records, defenders should avoid writing a narrowly targeted signature based on assumed parameter names or payload markers. Detection should instead focus on anomalous unauthenticated requests, application errors associated with deserialization, and unexpected process activity from the EasyFlow or IIS worker process.
Who’s Exposed
The affected product identified by NVD is Digiwin EasyFlow .NET, also rendered as DigiWin EasyFlow .NET in TWCERT/CC material. The linked TWCERT/CC advisory is titled “DigiWin｜EasyFlow .NET - 5 Vulnerabilities” and confirms the product context.
The exact affected version range is not specified in the retrieved NVD record. The available advisory content also did not expose a confirmed range for CVE-2026-102455. No responsible version statement such as “all versions before X” can be made from the available evidence.
| Version question | Confirmed answer |
|---|---|
| Affected product | Digiwin/DigiWin EasyFlow .NET |
| Exact affected versions | Not published in the retrieved records |
| Earliest affected version | Unknown |
| Latest affected version | Unknown |
| Fixed version | Not identified |
| Vendor patch identifier | Not identified |
Organizations should assume deployed EasyFlow .NET instances may be affected until Digiwin or TWCERT/CC provides version-specific guidance. Prioritize systems exposed directly to the internet, systems published through reverse proxies, and servers where the application service has access to sensitive databases, file shares, or administrative functions.
Severity Breakdown
CVE-2026-102455 has a reported CVSS v3 base score of 9.8, rated Critical. The description supports a high-impact assessment because the attack is remote, does not require authentication, and can result in arbitrary code execution on the server.
The NVD response used for this assessment did not include the CVSS vector. The individual CVSS components therefore cannot be authoritatively enumerated. The following table separates confirmed facts from information that still requires validation:
| CVSS element | Status |
|---|---|
| Base score | 9.8 |
| Severity | Critical |
| Network reachability | Supported by the remote attacker description |
| Authentication | Not required according to the description |
| User interaction | Not confirmed in the retrieved record |
| Scope | Not confirmed |
| Confidentiality impact | Not independently specified |
| Integrity impact | Not independently specified |
| Availability impact | Not independently specified |
| Full CVSS vector | Not supplied; confirm in the NVD record |
Security teams should confirm the vector directly in the NVD record before using component-level scoring for automated prioritization, exception handling, or risk reporting. The 9.8 base score is sufficient to prioritize exposure reduction, but it does not replace validation of the official vector.
Exploitation Status
CVE-2026-102455 was not listed in the CISA Known Exploited Vulnerabilities catalog during the research performed on September 30, 2026. The supplied research contains no CISA KEV date added, due date, required action, or ransomware-campaign flag associated with this CVE.
This means exploitation has not been confirmed through the CISA KEV catalog. It does not prove that exploitation has never occurred. KEV is an authoritative source, but it is not a complete record of every attempted or successful intrusion.
No verified public proof-of-concept repository, exploit module, or vendor-specific PoC was identified in the retrieved primary-source material. The current assessment is therefore:
| Exploitation indicator | Status |
|---|---|
| Verified public PoC | Not identified |
| Confirmed exploitation in the wild | Not confirmed |
| CISA KEV listing | No |
| Confirmed ransomware use | Not reported in the supplied research |
Defenders should still operate on a pre-exploitation basis. Critical unauthenticated remote-code-execution vulnerabilities can attract rapid research and scanning, particularly when the affected product is exposed to the internet. Reassess this status as vendor advisories, exploit repositories, threat-intelligence reports, and incident telemetry develop.
Sources
The primary vulnerability record is the NVD entry for CVE-2026-102455:
The relevant vendor-coordinated advisory is the TWCERT/CC bulletin titled “DigiWin｜EasyFlow .NET - 5 Vulnerabilities.” The English and Chinese advisory pages provide the product context, but the retrieved material did not establish the exact affected version range or fixed release for this CVE:
CISA’s Known Exploited Vulnerabilities catalog was checked for exploitation status. CVE-2026-102455 was not listed in the supplied research snapshot:
The absence of a fixed version, complete CVSS vector, verified public PoC, and confirmed in-the-wild exploitation is an information gap. Confirm those items against updated NVD, Digiwin, TWCERT/CC, and incident-response sources before closing the vulnerability or downgrading its priority.
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Detection Guidance
Start with asset and exposure discovery. Identify EasyFlow .NET hosts, the web server or application pool hosting them, external NAT or reverse-proxy mappings, and the service account under which the application runs. Prioritize systems that accept traffic from untrusted networks or have direct access to internal databases and file shares.
Review web server, reverse-proxy, Windows, and endpoint telemetry for unauthenticated requests followed by process creation. Pay particular attention to child processes launched by IIS worker processes or the EasyFlow service, including command shells, scripting engines, PowerShell, network utilities, and unexpected executables. Because the vulnerable route and serialization format are unknown, a negative search for a specific payload string is not sufficient to clear a host.
Organizations reviewing endpoint monitoring coverage can also evaluate a managed security product such as Malwarebytes alongside existing EDR and Windows event-collection controls. Tools do not replace investigation or vendor remediation, but they may help surface suspicious child processes and post-exploitation activity.
Technical Notes
A generic Windows event-log query can identify suspicious process creation involving IIS worker processes. This is a hunting query, not a CVE-specific signature:
DeviceProcessEvents
| where Timestamp > ago(30d)
| where InitiatingProcessFileName in~ ("w3wp.exe", "EasyFlow.exe", "EasyFlowService.exe")
| where FileName in~ (
"cmd.exe", "powershell.exe", "pwsh.exe", "cscript.exe",
"wscript.exe", "rundll32.exe", "regsvr32.exe", "certutil.exe",
"bitsadmin.exe", "mshta.exe"
)
| project Timestamp, DeviceName, InitiatingProcessFileName,
FileName, ProcessCommandLine, AccountName
| order by Timestamp desc
Adapt the process names above to the local installation. EasyFlow.exe and EasyFlowService.exe are examples of names to validate, not confirmed process names for every deployment.
For web logs, hunt for unauthenticated requests to the EasyFlow virtual directory or application followed by HTTP 500 responses, unusual request-body sizes, repeated malformed requests, or a sudden change in request rate. A practical starting pattern is:
<timestamp> <client-ip> <method> <uri> 500 <bytes> ... <user-agent>
Correlate these responses with Windows process-creation events, new files in application directories, new scheduled tasks or services, outbound connections from the server, and account changes. Preserve relevant logs before remediation if compromise is suspected.
Remediation Steps
No fixed version was identified in the retrieved NVD record or the available TWCERT/CC advisory content. The exact affected version range, vendor patch identifier, and fixed EasyFlow .NET release therefore remain unconfirmed. Obtain the remediation package directly from Digiwin or the applicable TWCERT/CC advisory channel, and verify its checksum and applicability against the installed product version before deployment.
Until a vendor-confirmed fix is available, reduce the attack surface. Remove direct internet exposure, allow access only from approved management or user networks, and place the application behind a VPN or tightly controlled reverse proxy. Authentication added at a proxy does not fully resolve the underlying issue unless all application paths are consistently protected.
Technical Notes
Because no vendor-specific upgrade command is confirmed, administrators should not run an invented package or assume a standard package-manager update exists for EasyFlow .NET. After receiving the vendor package, follow its documented installer or deployment procedure and record the installed version before and after the change.
For a dedicated Windows server where blocking the web ports is operationally acceptable, the following temporary host firewall rule blocks inbound HTTP and HTTPS traffic:
New-NetFirewallRule `
-DisplayName "Temporary block for exposed EasyFlow host" `
-Direction Inbound `
-Protocol TCP `
-LocalPort 80,443 `
-Action Block `
-Profile Domain,Private,Public
This is a disruptive containment measure and may block unrelated applications on the host. Use an upstream firewall or load balancer rule instead when possible, limiting access to approved source networks. If the EasyFlow service uses nonstandard ports, identify those ports from the IIS bindings, reverse-proxy configuration, or local network inventory before applying an equivalent restriction.
After applying the vendor fix, validate the result by checking the installed application version against the vendor’s fixed-release statement, restarting the relevant application service if required by the vendor instructions, and testing normal workflows. Review logs from before the upgrade and investigate suspicious process creation, outbound traffic, new accounts, persistence mechanisms, or modified application files.
If the server was internet-accessible and suspicious activity is found, treat it as a potential compromise rather than a routine patch event. Isolate the host, preserve volatile and disk evidence where feasible, rotate credentials that may have been accessible from the server, and rebuild from a trusted source when integrity cannot be established. Follow a documented incident response planning checklist to coordinate containment, evidence preservation, eradication, and recovery.