CVE-2025-59841
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 · uneditedFlag Forge is a Capture The Flag (CTF) platform. In versions from 2.2.0 to before 2.3.1, the FlagForge web application improperly handles session invalidation. Authenticated users can continue to access protected endpoints, such as /api/profile, even after logging out. CSRF tokens are also still valid post-logout, which can allow unauthorized actions. This issue has been patched in version 2.3.1.
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 · high confidenceFlag Forge versions 2.2.0 through 2.3.0 contain improper session invalidation where authenticated sessions are not terminated upon logout. Users can continue accessing protected API endpoints such as /api/profile after logging out, and CSRF tokens remain valid post-logout, enabling potential session hijacking or CSRF attacks.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data>= 2.2, < 2.3.1CVSS 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
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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 checksWork through these to decide whether this CVE applies to you.
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Identify installed Flag Forge versionCheck your application version file or metadata (common locations: package.json, version.txt, about page, or admin dashboard). Compare the version number against the affected range: >= 2.2.0 and < 2.3.1.Affected if Version is 2.2.0, 2.2.1, 2.2.2, 2.2.3, 2.2.4, 2.2.5, 2.2.6, 2.2.7, 2.2.8, 2.2.9, 2.3.0 (any version from 2.2.0 through 2.3.0)
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Test session persistence after logoutLog into the application, perform a logout, then attempt to access a protected endpoint such as /api/profile using the same session cookie or token that was used before logout.Affected if The request to /api/profile returns successful data or a 200 OK response after logout, indicating the session is still valid
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Verify CSRF token invalidationAfter logging out, attempt to perform an action that requires a CSRF token (such as a form submission or API POST request) using the previously issued CSRF token.Affected if The action is processed successfully or the server accepts the old CSRF token, indicating tokens remain valid post-logout
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Check session storage configurationInspect server-side session storage (database, Redis, file-based sessions) to confirm whether session records are being deleted or marked as invalid upon logout request.Affected if Session records persist in storage after logout, or session data is not being destroyed server-side
You are affected if your Flag Forge version is between 2.2.0 and 2.3.0 (inclusive) AND logout does not terminate your session or invalidate CSRF tokens.
Generated from the published advisory. Verify against your own configuration.
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.
dbcve · scoped2.3.1
Upgrade to version 2.3.1 or later. Additionally, implement proper server-side session destruction and CSRF token invalidation on logout, and consider adding session timeout policies.
2.3.1
- Check current installed version of FlagForge
- Upgrade to version 2.3.1 using the appropriate package manager (e.g., pip install flagforge==2.3.1, npm install, or equivalent)
- Restart the FlagForge service if running
- Verify the upgrade was successful by checking the version number
- Test that session invalidation now works correctly: log in, log out, and confirm protected endpoints like /api/profile return authentication errors
- Verify CSRF tokens are invalidated upon logout
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2025-59841 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2025-59841 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Version or environment caveats, and links to real fixes
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