CVE-2026-76187

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 — 3 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 Keycloak provider: the unauthenticated token endpoint accepts a client-credentials grant for any confidential client registered in the Keycloak realm, not only the client configured for Airflow. No allowlist restricts which client ids may authenticate, so the credentials of an unrelated application that happens to share the realm are valid Airflow login credentials, and Airflow mints a signed session token for that application's service account. The endpoint also answers unauthenticated credential guesses against Keycloak under Airflow's identity.

Affects deployments using the Keycloak auth manager whose realm is shared with other confidential clients. The attacker needs valid credentials for any one of those clients, not for Airflow. Resource authorization is still evaluated per subject, so the access gained is whatever that service account holds, plus any endpoint gated only on being authenticated.

Users of apache-airflow-providers-keycloak are recommended to upgrade to version 0.10.0 or later, which accepts only the configured client on that grant.

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
61%
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

oss-security - CVE-2026-76187: Apache Airflow Keycloak provider: Any realm client's credentials mint an Airflow session JWT

http://www.openwall.com/lists/oss-security/2026/09/15/9
generic
https://lists.apache.org/thread/[email protected]
generic
https://lists.apache.org/thread/5cqh5ojl3718ogb0q1dcd9vdr47z7gp3
github_pr

Accept only the configured client on the Keycloak client_credentials grant

Fix merged in apache/airflow PR #72205 on 2026-08-28 — awaiting tagged release

https://github.com/apache/airflow/pull/72205

Vendor Advisories for CVE-2026-76187(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 55× in last 7d / 74× 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. 2026-09-25 08:13 UTCGHSA enrichment
  2. 2026-09-25 04:10 UTCGHSA enrichment
  3. 2026-09-25 00:09 UTCGHSA enrichment
  4. 2026-09-24 20:06 UTCGHSA enrichment
  5. 2026-09-24 16:04 UTCEG score recompute
  6. 2026-09-24 16:04 UTCGHSA enrichment
  7. 2026-09-24 14:04 UTCEPSS rescore
  8. 2026-09-24 12:02 UTCGHSA enrichment
  9. 2026-09-24 07:59 UTCGHSA enrichment
  10. 2026-09-24 03:57 UTCGHSA enrichment
  11. 2026-09-23 23:54 UTCGHSA enrichment
  12. 2026-09-23 19:52 UTCEG score recompute
  13. 2026-09-23 19:52 UTCGHSA enrichment
  14. 2026-09-23 17:54 UTCEPSS rescore
  15. 2026-09-23 15:50 UTCGHSA enrichment
  16. 2026-09-23 11:48 UTCGHSA enrichment
  17. 2026-09-23 07:46 UTCGHSA enrichment
  18. 2026-09-23 03:43 UTCGHSA enrichment
  19. 2026-09-22 23:41 UTCGHSA enrichment
  20. 2026-09-22 19:39 UTCEG score recompute
  21. 2026-09-22 19:39 UTCGHSA enrichment
  22. 2026-09-22 16:01 UTCEPSS rescore
  23. 2026-09-22 15:37 UTCGHSA enrichment
  24. 2026-09-22 11:34 UTCGHSA enrichment
  25. 2026-09-22 07:32 UTCGHSA enrichment
Show 49 more
  1. 2026-09-22 03:30 UTCGHSA enrichment
  2. 2026-09-21 23:29 UTCEG score recompute
  3. 2026-09-21 23:28 UTCGHSA enrichment
  4. 2026-09-21 21:09 UTCEPSS rescore
  5. 2026-09-21 19:26 UTCGHSA enrichment
  6. 2026-09-21 15:24 UTCGHSA enrichment
  7. 2026-09-21 11:22 UTCGHSA enrichment
  8. 2026-09-21 07:19 UTCGHSA enrichment
  9. 2026-09-21 03:15 UTCGHSA enrichment
  10. 2026-09-20 23:13 UTCEG score recompute
  11. 2026-09-20 23:13 UTCGHSA enrichment
  12. 2026-09-20 20:16 UTCEPSS rescore
  13. 2026-09-20 19:10 UTCGHSA enrichment
  14. 2026-09-20 15:08 UTCGHSA enrichment
  15. 2026-09-20 11:06 UTCGHSA enrichment
  16. 2026-09-20 07:03 UTCGHSA enrichment
  17. 2026-09-20 03:01 UTCGHSA enrichment
  18. 2026-09-19 22:59 UTCGHSA enrichment
  19. 2026-09-19 18:57 UTCEG score recompute
  20. 2026-09-19 18:57 UTCGHSA enrichment
  21. 2026-09-19 14:55 UTCGHSA enrichment
  22. 2026-09-19 10:52 UTCGHSA enrichment
  23. 2026-09-19 06:50 UTCGHSA enrichment
  24. 2026-09-19 02:48 UTCGHSA enrichment
  25. 2026-09-18 22:46 UTCEG score recompute
  26. 2026-09-18 22:46 UTCGHSA enrichment
  27. 2026-09-18 19:28 UTCEPSS rescore
  28. 2026-09-18 18:44 UTCGHSA enrichment
  29. 2026-09-18 14:42 UTCGHSA enrichment
  30. 2026-09-18 12:36 UTCGHSA enrichment
  31. 2026-09-18 08:34 UTCGHSA enrichment
  32. 2026-09-18 04:32 UTCGHSA enrichment
  33. 2026-09-18 00:30 UTCEG score recompute
  34. 2026-09-18 00:30 UTCGHSA enrichment
  35. 2026-09-17 20:28 UTCEG score recompute
  36. 2026-09-17 20:28 UTCGHSA enrichment
  37. 2026-09-17 19:30 UTCEG score recompute▲ 9.80
  38. 2026-09-17 19:30 UTCGHSA enrichment
  39. 2026-09-17 19:29 UTCMITRE cvelistV5CVSS v3 → 9.8 · severity → CRITICAL
  40. 2026-09-16 19:11 UTCGHSA enrichment
  41. 2026-09-16 15:25 UTCGHSA enrichment
  42. 2026-09-16 15:19 UTCNVD update
  43. 2026-09-16 15:01 UTCEG score recompute
  44. 2026-09-16 15:01 UTCGHSA enrichment
  45. 2026-09-16 15:00 UTCMITRE cvelistV5
  46. 2026-09-16 14:08 UTCEPSS rescore
  47. 2026-09-16 10:25 UTCNVD update
  48. 2026-09-16 09:32 UTCEG score recompute
  49. 2026-09-16 09:31 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-76187?
CVE-2026-76187 is a critical vulnerability published on September 16, 2026. Apache Airflow Keycloak provider: the unauthenticated token endpoint accepts a client-credentials grant for any confidential client registered in the Keycloak realm, not only the client configured for Airflow. No allowlist restricts which client ids may authenticate, so the credentials of an…
When was CVE-2026-76187 disclosed?
CVE-2026-76187 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-2026-76187 actively exploited?
CVE-2026-76187 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 39.5% of all scored CVEs.
What is the CVSS score of CVE-2026-76187?
CVE-2026-76187 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-76187?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-76187, 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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