CVE-2025-59841

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 68% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Flag 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.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
59(Track)
EG Risk 59/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
32.0%
KEV
Not listed

Published

September 25, 2025

Last Modified

October 8, 2025

Advisory Details (2)

Auto-updated Jun 13, 2026
Patch available. Sources: github_commit, github.
github Patch Available

Improper Session Handling Allows Access After Logout · Advisory · FlagForgeCTF/flagForge · GitHub

https://github.com/FlagForgeCTF/flagForge/security/advisories/GHSA-h6pr-4cwv-6cjg
github_commit Patch Available

commit 304b6c82a4f7 (FlagForgeCTF/flagForge)

Patch available: FlagForgeCTF/flagForge v2.3.1 (contains commit 304b6c82a4f7)

https://github.com/FlagForgeCTF/flagForge/commit/304b6c82a4f76871b336404b91e5cdd8a7d7d5bd

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 43× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-23 03:00 UTCEG score recompute
  2. 2026-07-22 14:08 UTCEPSS rescore
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  28. 2026-06-18 01:43 UTCOSV refresh
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  62. 2026-05-29 22:01 UTCEG score recompute
  63. 2026-05-29 13:44 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2025-59841?
CVE-2025-59841 is a critical vulnerability published on September 25, 2025. Flag 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…
When was CVE-2025-59841 disclosed?
CVE-2025-59841 was first published in the National Vulnerability Database on September 25, 2025, with the most recent update on October 8, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-59841 actively exploited?
CVE-2025-59841 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 32.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2025-59841?
CVE-2025-59841 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2025-59841?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-59841, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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