CVE-2026-39924

MEDIUMPre-NVD 6.86.8—
EchelonGraph scoreHIGH confidence

Score 6.8 from GitHub Security Advisory (severity: HIGH) published 2026-08-05. the CNA's CVSS baseline 6.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:vulncheck, epss, ghsa
Trending — 3 sources updated this week
6.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.8Exploit: None knownExposed: 0

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

Flarum before 1.8.16 contains an improper session invalidation vulnerability that allows attackers who hold a valid session token to retain full account access after a victim changes their password, because the access_tokens table is never cleared on password change events. The TokensClearer::clearPasswordTokens() function only removes rows from the password_tokens table while leaving all active session cookies and API bearer tokens intact, including long-lived RememberAccessToken entries, and administrator-forced password resets via the user update endpoint are equally ineffective at revoking attacker-held sessions.

CVSS v3
6.8
EG Score
6.8(high)
EG Risk
31(Track)
EG Risk 31/100SSVC: 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
Severity68% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
13%
KEV
Not listed

Published

August 5, 2026

Last Modified

August 14, 2026

Advisory Details (4)

Auto-updated Aug 5, 2026
Patch available. Sources: github_release, github_pr, github_commit.
generic

Flarum < 1.8.16 Session Persistence via Improper Access Token Revocation | Advisories | VulnCheck

https://www.vulncheck.com/advisories/flarum-session-persistence-via-improper-access-token-revocation
github_commit Patch Available

commit 5f080293a029 (flarum/framework)

Patch available: flarum/framework v1.8.16 (contains commit 5f080293a029)

https://github.com/flarum/framework/commit/5f080293a029d0d273eb9678d597c74ea86a3bcc
github_pr Patch Available

[1.x] fix: invalidate active sessions when password is changed

Patch available: flarum/framework v1.8.16 (PR #4546 merged 2026-04-11)

https://github.com/flarum/framework/pull/4546
github_release Patch Available

v1.8.16

Patch available: flarum/framework v1.8.16

https://github.com/flarum/framework/releases/tag/v1.8.16

Vendor Advisories for CVE-2026-39924(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 20× in last 7d / 44× 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. 2026-08-20 20:05 UTCGHSA enrichment
  2. 2026-08-19 19:55 UTCEG score recompute
  3. 2026-08-19 19:55 UTCGHSA enrichment
  4. 2026-08-19 17:03 UTCEPSS rescore
  5. 2026-08-18 19:41 UTCEG score recompute
  6. 2026-08-18 19:41 UTCGHSA enrichment
  7. 2026-08-18 13:48 UTCEPSS rescore
  8. 2026-08-17 19:31 UTCEG score recompute
  9. 2026-08-17 19:31 UTCGHSA enrichment
  10. 2026-08-17 13:47 UTCEPSS rescore
  11. 2026-08-16 17:40 UTCEG score recompute
  12. 2026-08-16 17:40 UTCGHSA enrichment
  13. 2026-08-16 14:56 UTCEPSS rescore
  14. 2026-08-16 02:14 UTCEPSS rescore
  15. 2026-08-15 17:22 UTCEG score recompute
  16. 2026-08-15 17:22 UTCGHSA enrichment
  17. 2026-08-15 01:30 UTCEPSS rescore
  18. 2026-08-14 17:11 UTCEG score recompute
  19. 2026-08-14 17:11 UTCGHSA enrichment
  20. 2026-08-13 22:00 UTCEPSS rescore
  21. 2026-08-13 17:52 UTCGHSA enrichment
  22. 2026-08-12 17:40 UTCEG score recompute
  23. 2026-08-12 17:40 UTCGHSA enrichment
  24. 2026-08-12 13:51 UTCEPSS rescore
  25. 2026-08-11 17:30 UTCEG score recompute
Show 19 more
  1. 2026-08-11 17:30 UTCGHSA enrichment
  2. 2026-08-11 13:43 UTCEPSS rescore
  3. 2026-08-11 00:00 UTCEPSS rescore
  4. 2026-08-10 17:20 UTCGHSA enrichment
  5. 2026-08-09 17:10 UTCEG score recompute
  6. 2026-08-09 17:10 UTCGHSA enrichment
  7. 2026-08-09 13:46 UTCEPSS rescore
  8. 2026-08-08 17:00 UTCEG score recompute
  9. 2026-08-08 17:00 UTCGHSA enrichment
  10. 2026-08-08 16:37 UTCEPSS rescore
  11. 2026-08-07 16:49 UTCEG score recompute
  12. 2026-08-07 16:49 UTCGHSA enrichment
  13. 2026-08-06 16:39 UTCEG score recompute
  14. 2026-08-06 16:39 UTCGHSA enrichment
  15. 2026-08-06 13:46 UTCEPSS rescore
  16. 2026-08-05 16:29 UTCEG score recompute
  17. 2026-08-05 16:12 UTCEG score recompute
  18. 2026-08-05 15:26 UTCEG score recompute
  19. 2026-08-05 15:25 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-39924?
CVE-2026-39924 is a medium vulnerability published on August 5, 2026. Flarum before 1.8.16 contains an improper session invalidation vulnerability that allows attackers who hold a valid session token to retain full account access after a victim changes their password, because the accesstokens table is never cleared on password change events. The…
When was CVE-2026-39924 disclosed?
CVE-2026-39924 was first published in the National Vulnerability Database on August 5, 2026, with the most recent update on August 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-39924 actively exploited?
CVE-2026-39924 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 86.6% of all scored CVEs.
What is the CVSS score of CVE-2026-39924?
CVE-2026-39924 has a CVSS v4.0 base score of 6.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-39924?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-39924, 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.

Dependency Blast Radius

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