CVE-2026-76186

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreHIGH confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-16. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 5 sources updated this week
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.1Exploit: None knownExposed: 0

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

Apache Airflow Keycloak provider: from Airflow 3.3 the Keycloak auth manager takes a user's identity from the signed Airflow session token but takes the Keycloak access and refresh tokens used for every authorization decision from separate, unauthenticated cookies, and never checks that the two describe the same subject. A user who holds any valid Airflow login of their own, together with another subject's Keycloak access or refresh token obtained out of band, can pair the two: Airflow then authorizes requests with the foreign token's privileges while the session identity, audit log and cache keys continue to name the attacker's own account. The refresh path re-issues an Airflow session token for the original identity carrying the foreign tokens, so the mismatched pairing survives across sessions.

Affects deployments running Airflow 3.3 or later with the Keycloak auth manager. Earlier versions carried the Keycloak tokens inside the signed session token, so the binding existed and was lost when they moved into separate cookies.

Users of apache-airflow-providers-keycloak are recommended to upgrade to version 0.10.0 or later, which binds the cookie-supplied tokens to the session identity.

CVSS v3
9.1
EG Score
9.1(high)
EG Risk
56(Track)
EG Risk 56/100SSVC: 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
Severity91% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
42%
KEV
Not listed

Published

September 16, 2026

Last Modified

September 18, 2026

Advisory Details (3)

Auto-updated Sep 17, 2026
Upstream fix merged — awaiting tagged release. Sources: github_pr.
generic
https://lists.apache.org/thread/5cqh5ojl3718ogb0q1dcd9vdr47z7gp3
generic
https://lists.apache.org/thread/[email protected]
github_pr

Bind Keycloak cookie tokens to the Airflow session identity

Fix merged in apache/airflow PR #72207 on 2026-08-29 — awaiting tagged release

https://github.com/apache/airflow/pull/72207

Vendor Advisories for CVE-2026-76186(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 27× in last 7d / 27× 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 07:30 UTCGHSA enrichment
  2. 2026-09-19 03:18 UTCGHSA enrichment
  3. 2026-09-18 23:06 UTCEG score recompute
  4. 2026-09-18 23:06 UTCGHSA enrichment
  5. 2026-09-18 19:28 UTCEPSS rescore
  6. 2026-09-18 18:54 UTCGHSA enrichment
  7. 2026-09-18 14:42 UTCGHSA enrichment
  8. 2026-09-18 13:16 UTCGHSA enrichment
  9. 2026-09-18 09:04 UTCGHSA enrichment
  10. 2026-09-18 04:52 UTCGHSA enrichment
  11. 2026-09-18 00:40 UTCEG score recompute
  12. 2026-09-18 00:40 UTCGHSA enrichment
  13. 2026-09-17 20:28 UTCEG score recompute
  14. 2026-09-17 20:28 UTCGHSA enrichment
  15. 2026-09-17 19:30 UTCEG score recompute▲ 9.10
  16. 2026-09-17 19:30 UTCGHSA enrichment
  17. 2026-09-17 19:29 UTCMITRE cvelistV5CVSS v3 → 9.1 · severity → CRITICAL
  18. 2026-09-16 19:11 UTCGHSA enrichment
  19. 2026-09-16 15:25 UTCGHSA enrichment
  20. 2026-09-16 15:19 UTCNVD update
  21. 2026-09-16 15:01 UTCEG score recompute
  22. 2026-09-16 15:01 UTCGHSA enrichment
  23. 2026-09-16 15:00 UTCMITRE cvelistV5
  24. 2026-09-16 14:08 UTCEPSS rescore
  25. 2026-09-16 10:25 UTCNVD update
Show 2 more
  1. 2026-09-16 09:32 UTCEG score recompute
  2. 2026-09-16 09:31 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-76186?
CVE-2026-76186 is a critical vulnerability published on September 16, 2026. Apache Airflow Keycloak provider: from Airflow 3.3 the Keycloak auth manager takes a user's identity from the signed Airflow session token but takes the Keycloak access and refresh tokens used for every authorization decision from separate, unauthenticated cookies, and never checks that the two…
When was CVE-2026-76186 disclosed?
CVE-2026-76186 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-2026-76186 actively exploited?
CVE-2026-76186 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 57.7% of all scored CVEs.
What is the CVSS score of CVE-2026-76186?
CVE-2026-76186 has a CVSS v3.1 base score of 9.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-76186?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-76186, 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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