CVE-2026-76878

HIGHPre-NVD 8.48.4—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.4 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5%, top 60% 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, secondary
Trending — 3 sources updated this week
8.4EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.4Exploit: None knownExposed: 0

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

In OpenStack Aodh before 22.0.1, the alarm list API bypasses project scoping when the all_projects query parameter is set to false. The API checks for the presence of the all_projects key rather than its value; a true value enforces the administrator-only policy, but a false value removes the key and skips the branch that normally restricts results to the caller's project. A non-admin user with the reader role can list alarms from all projects, exposing alarm actions containing trust webhook URLs, Heat signal endpoints, project IDs, and user IDs. The parameter can also be combined with a foreign project_id to target a specific project's alarms. A related concern is that OpenStack Watcher does not apply authorization to its webhook trigger endpoint. Any authenticated user who learns an audit's webhook URL, for example from this leaked Aodh alarm metadata, can start an EVENT audit and its associated action plan regardless of their own project or role. The webhook endpoint has lacked policy enforcement since its introduction in the Ussuri release (Watcher 4.0.0).

CVSS v3
8.4
EG Score
8.4(medium)
EG Risk
38(Track)
EG Risk 38/100SSVC: 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
Severity84% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
40%
KEV
Not listed

Published

August 19, 2026

Last Modified

September 9, 2026

Advisory Details (5)

Auto-updated Aug 19, 2026
No patch confirmed yet.
generic

oss-security - [OSSA-2026-036] OpenStack Aodh and Watcher: Aodh cross-project alarm enumeration and Watcher webhook authorization bypass (CVE-2026-pending)

https://www.openwall.com/lists/oss-security/2026/08/19/5
generic

[OSSA-2026-036] OpenStack Aodh and Watcher: Aodh cross-project alarm enumeration and Watcher webhook authorization bypass (CVE-2026-pending) - OpenStack-announce - lists.openstack.org

https://lists.openstack.org/archives/list/[email protected]/thread/O6PKAUNMNZP6FRHLUUGBYELCRBEPB52B/
generic

OSSA-2026-036: Aodh cross-project alarm enumeration and Watcher webhook authorization bypass — OpenStack Security Advisories 0.0.1.dev373 documentation

https://security.openstack.org/ossa/OSSA-2026-036.html
generic

Bug #2161771 “[OSSA-2026-036] Watcher Lets an Unrelated Authenti...” : Bugs : OpenStack Security Advisory

https://launchpad.net/bugs/2161771
generic

Bug #2161276 “[OSSA-2026-036] Aodh all_projects=false bypasses p...” : Bugs : OpenStack Security Advisory

https://launchpad.net/bugs/2161276

Vendor Advisories for CVE-2026-76878(1)

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

Affected Packages

(6 across 3 ecosystems)
Debian:12(2)
PackageVulnerable rangeFixed inDependents
aodh15.0.0-3 ... 22.0.0~rc1-5 (33 versions)——
watcher10.0.0-1 ... 9.0.0-2 (33 versions)——
Debian:13(2)
PackageVulnerable rangeFixed inDependents
aodh20.0.0-2 ... 22.0.0~rc1-5 (15 versions)——
watcher14.0.0-1 ... 16.0.0~rc1-4 (18 versions)——
Debian:14(2)
PackageVulnerable rangeFixed inDependents
aodh20.0.0-2 ... 22.0.0~rc1-5 (14 versions)22.0.0-3—
watcher14.0.0-1 ... 16.0.0~rc1-4 (16 versions)16.0.0-5—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 25× in last 7d / 118× 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.

Showing the most recent 100 of 121 total refreshes for this CVE.

  1. 2026-09-19 02:49 UTCEG score recompute
  2. 2026-09-19 02:49 UTCGHSA enrichment
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-18 14:59 UTCGHSA enrichment
  5. 2026-09-18 03:09 UTCEG score recompute
  6. 2026-09-18 03:09 UTCGHSA enrichment
  7. 2026-09-17 15:20 UTCGHSA enrichment
  8. 2026-09-17 03:30 UTCGHSA enrichment
  9. 2026-09-16 14:57 UTCEG score recompute
  10. 2026-09-16 14:57 UTCGHSA enrichment
  11. 2026-09-16 14:08 UTCEPSS rescore
  12. 2026-09-16 05:15 UTCEPSS rescore
  13. 2026-09-16 03:04 UTCGHSA enrichment
  14. 2026-09-15 15:14 UTCEG score recompute
  15. 2026-09-15 15:14 UTCGHSA enrichment
  16. 2026-09-15 03:12 UTCEPSS rescore
  17. 2026-09-15 03:10 UTCGHSA enrichment
  18. 2026-09-14 15:20 UTCGHSA enrichment
  19. 2026-09-14 03:28 UTCEG score recompute
  20. 2026-09-14 03:28 UTCGHSA enrichment
  21. 2026-09-13 15:39 UTCGHSA enrichment
  22. 2026-09-13 03:45 UTCGHSA enrichment
  23. 2026-09-12 15:55 UTCEG score recompute
  24. 2026-09-12 15:55 UTCGHSA enrichment
  25. 2026-09-12 15:02 UTCEPSS rescore
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  1. 2026-09-12 04:05 UTCGHSA enrichment
  2. 2026-09-11 16:15 UTCEG score recompute
  3. 2026-09-11 16:15 UTCGHSA enrichment
  4. 2026-09-11 14:53 UTCEPSS rescore
  5. 2026-09-11 04:25 UTCGHSA enrichment
  6. 2026-09-10 16:35 UTCEG score recompute
  7. 2026-09-10 16:35 UTCGHSA enrichment
  8. 2026-09-10 09:35 UTCEPSS rescore
  9. 2026-09-10 04:13 UTCGHSA enrichment
  10. 2026-09-09 16:11 UTCGHSA enrichment
  11. 2026-09-09 14:38 UTCGHSA enrichment
  12. 2026-09-09 02:09 UTCEG score recompute
  13. 2026-09-09 02:08 UTCGHSA enrichment
  14. 2026-09-08 22:01 UTCEPSS rescore
  15. 2026-09-08 03:25 UTCEG score recompute
  16. 2026-09-08 03:25 UTCGHSA enrichment
  17. 2026-09-07 15:36 UTCGHSA enrichment
  18. 2026-09-07 00:35 UTCEG score recompute
  19. 2026-09-07 00:34 UTCGHSA enrichment
  20. 2026-09-06 13:48 UTCEPSS rescore
  21. 2026-09-06 12:43 UTCGHSA enrichment
  22. 2026-09-06 00:54 UTCEG score recompute
  23. 2026-09-06 00:53 UTCGHSA enrichment
  24. 2026-09-05 13:00 UTCGHSA enrichment
  25. 2026-09-05 01:10 UTCEG score recompute
  26. 2026-09-05 01:10 UTCGHSA enrichment
  27. 2026-09-04 13:20 UTCEG score recompute
  28. 2026-09-04 13:20 UTCGHSA enrichment
  29. 2026-09-04 05:07 UTCEPSS rescore
  30. 2026-09-04 01:30 UTCGHSA enrichment
  31. 2026-09-03 13:39 UTCGHSA enrichment
  32. 2026-09-03 01:44 UTCEG score recompute
  33. 2026-09-03 01:44 UTCGHSA enrichment
  34. 2026-09-02 14:12 UTCEPSS rescore
  35. 2026-09-02 13:54 UTCGHSA enrichment
  36. 2026-09-02 01:46 UTCGHSA enrichment
  37. 2026-09-01 13:56 UTCEG score recompute
  38. 2026-09-01 13:56 UTCGHSA enrichment
  39. 2026-09-01 13:54 UTCEPSS rescore
  40. 2026-09-01 04:40 UTCEPSS rescore
  41. 2026-09-01 04:40 UTCEPSS rescore
  42. 2026-09-01 01:59 UTCGHSA enrichment
  43. 2026-08-31 14:10 UTCGHSA enrichment
  44. 2026-08-31 01:01 UTCEG score recompute
  45. 2026-08-31 01:01 UTCGHSA enrichment
  46. 2026-08-30 19:18 UTCEPSS rescore
  47. 2026-08-30 19:17 UTCEPSS rescore
  48. 2026-08-30 13:11 UTCEG score recompute
  49. 2026-08-30 13:11 UTCGHSA enrichment
  50. 2026-08-30 01:22 UTCEPSS rescore
  51. 2026-08-30 01:21 UTCGHSA enrichment
  52. 2026-08-29 13:31 UTCGHSA enrichment
  53. 2026-08-29 01:35 UTCEG score recompute
  54. 2026-08-29 01:34 UTCGHSA enrichment
  55. 2026-08-28 21:42 UTCEPSS rescore
  56. 2026-08-28 11:42 UTCGHSA enrichment
  57. 2026-08-27 23:52 UTCEG score recompute
  58. 2026-08-27 23:52 UTCGHSA enrichment
  59. 2026-08-27 14:25 UTCEPSS rescore
  60. 2026-08-27 12:03 UTCGHSA enrichment
  61. 2026-08-27 00:14 UTCEG score recompute
  62. 2026-08-27 00:14 UTCGHSA enrichment
  63. 2026-08-26 14:47 UTCEPSS rescore
  64. 2026-08-26 12:24 UTCGHSA enrichment
  65. 2026-08-26 00:34 UTCEG score recompute
  66. 2026-08-26 00:34 UTCGHSA enrichment
  67. 2026-08-25 13:49 UTCEPSS rescore
  68. 2026-08-25 12:44 UTCGHSA enrichment
  69. 2026-08-25 00:54 UTCEG score recompute
  70. 2026-08-25 00:54 UTCGHSA enrichment
  71. 2026-08-24 14:18 UTCEPSS rescore
  72. 2026-08-24 13:05 UTCEG score recompute
  73. 2026-08-24 13:05 UTCGHSA enrichment
  74. 2026-08-24 01:15 UTCGHSA enrichment
  75. 2026-08-23 13:25 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-76878?
CVE-2026-76878 is a high vulnerability published on August 19, 2026. In OpenStack Aodh before 22.0.1, the alarm list API bypasses project scoping when the allprojects query parameter is set to false. The API checks for the presence of the allprojects key rather than its value; a true value enforces the administrator-only policy, but a false value removes the key and…
When was CVE-2026-76878 disclosed?
CVE-2026-76878 was first published in the National Vulnerability Database on August 19, 2026, with the most recent update on September 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-76878 actively exploited?
CVE-2026-76878 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 59.8% of all scored CVEs.
What is the CVSS score of CVE-2026-76878?
CVE-2026-76878 has a CVSS v3 base score of 8.4 (NVD).
How do I remediate CVE-2026-76878?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-76878, 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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