Affects OpenStack core components used widely in public/private clouds; enables cross-project data leakage and remote triggering of orchestration—operational impact for cloud operators.
CVE-2026-76878
OpenStack Aodh auth bypass leaks alarms; Watcher webhooks lack auth and can be triggered.
Is CVE-2026-76878 being exploited?
Not confirmed. CVE-2026-76878 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.48% probability of exploitation in the next 30 days.
How severe is CVE-2026-76878?
CVE-2026-76878 is rated High. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-76878?
Yes. A fix has been recorded for CVE-2026-76878. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-76878 affect?
CVE-2026-76878 affects OpenStack Aodh (< 22.0.1), OpenStack Watcher (since Ussuri / Watcher 4.0.0). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-76878?
Upgrade Aodh to >=22.0.1, enforce auth on Watcher webhooks, rotate exposed URLs/credentials.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Non-admin readers can list alarms across projects exposing webhook/Heat URLs and IDs; attackers can invoke Watcher webhooks to start EVENT audits and action plans.
Immediate action required
- affected>= 10.0.0 and < 20.0.1
- affected>= 21.0.0 and < 21.0.1
- affected>= 22.0.0 and < 22.0.1
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.