CVE-2026-57580
authentik SAML NameID XML-comment injection enables account takeover.
Is CVE-2026-57580 being exploited?
Not confirmed. CVE-2026-57580 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 0.44% probability of exploitation in the next 30 days.
How severe is CVE-2026-57580?
CVE-2026-57580 is rated Critical. 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-2026-57580?
Yes. A fix has been recorded for CVE-2026-57580. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-57580 affect?
CVE-2026-57580 affects authentik versions prior to 2026.2.6, authentik versions prior to 2026.5.5, Inbound SAML Source using USERNAME_LINK or EMAIL_LINK. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-57580?
Upgrade to 2026.2.6 or 2026.5.5; otherwise disable USERNAME_LINK/EMAIL_LINK or block untrusted IdPs.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Attacker with an IdP account can inject a NameID XML comment to bind to a victim account and gain full access without passwords or IdP private key.
Immediate action required
- affected< 2026.2.6
- affected>= 2026.5.0 and < 2026.5.5
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.