CVE-2026-12249
MITM via HTTP AD CS auto-enroll enables rogue CA in trust store.
Is CVE-2026-12249 being exploited?
Not confirmed. CVE-2026-12249 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 0.14% probability of exploitation in the next 30 days.
How severe is CVE-2026-12249?
CVE-2026-12249 is rated Critical with a CVSS score of 9.0. 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-2026-12249?
Yes. A fix has been recorded for CVE-2026-12249. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-12249 affect?
CVE-2026-12249 affects Canonical ADSys <= v0.16.2, Ubuntu AD CS auto-enroll with ADSys. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-12249?
Upgrade to v0.16.3; verify trust store integrity.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Rogue Root CA can decrypt/intercept TLS traffic; trust store poisoned system-wide.
Immediate action required