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% (43rd percentile of EPSS-scored CVEs). 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 — 4 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: 0.5%CVSS: 8.4Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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
8.4HIGHmedium confidence
EG Risk
38
EG Risk 38/100CISA SSVC

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%
Exploitation1% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.5%
EPSS %ILE
43rd
KEV
Not listed

CISA SSVCTrack at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 19, 2026

Last Modified

September 9, 2026

Advisory Details (5)

Auto-updated Aug 19, 2026
Patch available.
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.

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntuwatcher-doc (2:8.0.0-0ubuntu1.2+esm1) @ jammy2026-10-07ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(6 across 3 ecosystems)
Debian:12(2)
PackageVulnerable rangeFix by version rangeDependents
aodh15.0.0-3 ... 23.0.0~rc1-2 (37 versions)
  • every version on: no fix on record
—
watcher10.0.0-1 ... 9.0.0-2 (37 versions)
  • every version on: no fix on record
—
Debian:13(2)
PackageVulnerable rangeFix by version rangeDependents
aodh20.0.0-2 ... 23.0.0~rc1-2 (19 versions)
  • every version on: no fix on record
—
watcher14.0.0-1 ... 17.0.0~rc1-2 (22 versions)
  • every version on: no fix on record
—
Debian:14(2)
PackageVulnerable rangeFix by version rangeDependents
aodh20.0.0-2 ... 22.0.0~rc1-5 (14 versions)
  • every version up to 22.0.0-3: fixed in 22.0.0-3
—
watcher14.0.0-1 ... 16.0.0~rc1-4 (16 versions)
  • every version up to 16.0.0-5: fixed in 16.0.0-5
—

Weakness Classification(1)

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

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 22× in last 7d / 103× 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 190 total refreshes for this CVE.

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

Related CVEs(same product + same CWE)

Same product

1 shown

Debian:12:aodh

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 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 0.5% probability of exploitation in the next 30 days (43rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-76878?
CVE-2026-76878 has a CVSS base score of 8.4 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-76878?
A fix for CVE-2026-76878 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-76878 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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