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Code InjectionWeakness · CWE-94

CVE-2026-8931

CRITICAL · 9.4 CVSS v4.0 Published 2026-06-01
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
A critical Remote Code Execution (RCE) vulnerability exists in Disig Web Signer versions 2.0.3 through 2.5.3.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · moderate confidence

A critical Remote Code Execution (RCE) vulnerability in Disig Web Signer versions 2.0.3 through 2.5.3 allows remote attackers to execute arbitrary code on the affected system. The specific attack vector and technical root cause are not disclosed in the available advisory.

MitigationUpgrade to a patched version if available; otherwise, restrict network exposure and implement compensating controls such as network segmentation and strict access controls to limit the attack surface.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
Authentication
X
User interaction
P
Scope
X

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify if Disig Web Signer is installed
    Locate the Disig Web Signer application on the system using system inventory tools, package managers, or by searching for the product name in installed programs
    Affected if Disig Web Signer software is present on the system
  2. Determine the installed version
    Check the installed version of Disig Web Signer through the application itself, its about dialog, installed programs details, or version information in installation directories
    Affected if The installed version falls within the range 2.0.3 to 2.5.3 inclusive
  3. Verify service accessibility
    Determine if the Disig Web Signer web interface or service is exposed and accessible to network users
    Affected if The service is network-accessible without proper authentication or network restrictions

The environment is affected if Disig Web Signer versions 2.0.3 through 2.5.3 are installed and the vulnerable service is network-accessible.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

From vendor data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Upgrade to a patched version if available; otherwise, restrict network exposure and implement compensating controls such as network segmentation and strict access controls to limit the attack surface.

Have this fixed Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing6.0 h
  • Review / QA2.0 h
20.0 hours of engineering $3,500
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-8931 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data