CVE-2026-82311

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-16. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 5 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: None knownExposed: 0

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

Apache Airflow FAB provider: resetting a user's password does not delete that user's existing database-backed sessions, despite documented behaviour that it does. The cleanup compares the string identifier Flask-Login stores in the session against the user's integer database identifier, so the comparison never matches and no session is removed. An attacker who already holds a copy of the victim's session cookie keeps access as that user after the password change, so the reset does not evict them.

Affects deployments using the FAB auth manager with [fab] session_backend=database. The trigger is an administrator (or the user) running the supported password-reset command as a containment action after a session cookie has been compromised; the secure-cookie backend is out of scope, as it documents that it cannot centrally delete sessions.

apache-airflow-providers-fab 3.9.0 also fixes CVE-2026-86462, a second, independent route to the same outcome via the Admin user-edit endpoint; a single upgrade closes both.

Users of apache-airflow-providers-fab are recommended to upgrade to version 3.9.0 or later, which compares the identifiers consistently.

CVSS v3
9.8
EG Score
9.8(high)
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%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
60%
KEV
Not listed

Published

September 16, 2026

Last Modified

September 18, 2026

Advisory Details (4)

Auto-updated Sep 18, 2026
Upstream fix merged — awaiting tagged release. Sources: github_pr.
generic
https://www.cve.org/CVERecord?id=CVE-2026-86462
generic
https://lists.apache.org/thread/[email protected]
generic
https://lists.apache.org/thread/mmplwl93shy615shkpp9p4fzyjvr4yqw
github_pr

Compare session and user identifiers consistently when resetting a password

Fix merged in apache/airflow PR #72198 on 2026-08-28 — awaiting tagged release

https://github.com/apache/airflow/pull/72198

Vendor Advisories for CVE-2026-82311(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 31× in last 7d / 31× 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. 2026-09-19 21:01 UTCGHSA enrichment
  2. 2026-09-19 17:15 UTCEG score recompute
  3. 2026-09-19 17:15 UTCGHSA enrichment
  4. 2026-09-19 13:28 UTCGHSA enrichment
  5. 2026-09-19 09:42 UTCGHSA enrichment
  6. 2026-09-19 05:54 UTCGHSA enrichment
  7. 2026-09-19 02:08 UTCGHSA enrichment
  8. 2026-09-18 22:20 UTCEG score recompute
  9. 2026-09-18 22:20 UTCGHSA enrichment
  10. 2026-09-18 19:28 UTCEPSS rescore
  11. 2026-09-18 18:34 UTCGHSA enrichment
  12. 2026-09-18 14:42 UTCGHSA enrichment
  13. 2026-09-18 11:35 UTCGHSA enrichment
  14. 2026-09-18 07:47 UTCGHSA enrichment
  15. 2026-09-18 04:01 UTCGHSA enrichment
  16. 2026-09-18 00:15 UTCEG score recompute
  17. 2026-09-18 00:15 UTCGHSA enrichment
  18. 2026-09-17 20:29 UTCGHSA enrichment
  19. 2026-09-17 19:39 UTCEG score recompute▲ 9.80
  20. 2026-09-17 19:39 UTCGHSA enrichment
  21. 2026-09-17 19:39 UTCMITRE cvelistV5CVSS v3 → 9.8 · severity → CRITICAL
  22. 2026-09-16 19:11 UTCGHSA enrichment
  23. 2026-09-16 15:25 UTCGHSA enrichment
  24. 2026-09-16 15:19 UTCNVD update
  25. 2026-09-16 15:01 UTCEG score recompute
Show 6 more
  1. 2026-09-16 15:01 UTCGHSA enrichment
  2. 2026-09-16 15:00 UTCMITRE cvelistV5
  3. 2026-09-16 14:08 UTCEPSS rescore
  4. 2026-09-16 09:29 UTCNVD update
  5. 2026-09-16 09:11 UTCEG score recompute
  6. 2026-09-16 09:11 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-82311?
CVE-2026-82311 is a critical vulnerability published on September 16, 2026. Apache Airflow FAB provider: resetting a user's password does not delete that user's existing database-backed sessions, despite documented behaviour that it does. The cleanup compares the string identifier Flask-Login stores in the session against the user's integer database identifier, so the…
When was CVE-2026-82311 disclosed?
CVE-2026-82311 was first published in the National Vulnerability Database on September 16, 2026, with the most recent update on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-82311 actively exploited?
CVE-2026-82311 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 40.3% of all scored CVEs.
What is the CVSS score of CVE-2026-82311?
CVE-2026-82311 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-82311?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-82311, 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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