CVE-2026-49757
OAuth/OIDC auth bypass enables local account takeover via email identity.
Is CVE-2026-49757 being exploited?
Not confirmed. CVE-2026-49757 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 0.61% probability of exploitation in the next 30 days.
How severe is CVE-2026-49757?
CVE-2026-49757 is rated Critical with a CVSS score of 9.2. 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-2026-49757?
Yes. A fix has been recorded for CVE-2026-49757. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-49757 affect?
CVE-2026-49757 affects ash_authentication (versions < 4.14.0, <5.0.0-rc.10). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-49757?
Upgrade to ash_authentication >= 4.14.0 or 5.0.0-rc.10
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated attacker can take over a victim's local account by using the victim's email in OAuth/OIDC sign-in (email not a stable id).
Immediate action required
- affected>= 0.1.0 and < 4.14.0
- affected>= 5.0.0-rc.0 and < 5.0.0-rc.10
- affected>= c5f589058e04239263f50a1430eb17ea6d5dd1a2 and < *
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.