authentik is an open-source identity provider. Prior to 2026.2.7, 2026.5.7, and 2026.8.2, an authentik SAML Source verifies an assertion's signature and validity period but does not ensure that the identity provider issued the assertion for that Source or in response to a login request from that Source. The SAML Source also does not record already accepted assertions, allowing replay.
An unauthenticated actor who possesses such a valid assertion can use an assertion intended for another service provider or reuse an earlier assertion to authenticate as the user named by the assertion. Only SAML Sources are affected; SAML Providers and other Source types are not affected. This issue is fixed in versions 2026.2.7, 2026.5.7, and 2026.8.2.
Характеристики атаки
Способ атаки
По сети
Атака возможна удалённо
Сложность
Высокая
Сложно эксплуатировать
Нужны права
Не требуются
Права не нужны
Участие пользователя
Не требуется
Не нужно действие пользователя
Последствия
Конфиденциальность
Высокое
Полная утечка данных
Целостность
Высокое
Полная модификация данных
Доступность
Нет
Нет нарушения работы
Строка CVSS v3.1
Тип уязвимости (CWE)
Ссылки 15
https://docs.goauthentik.io/releases/2026.2#fixed-in-202627
security-advisories@github.com
https://docs.goauthentik.io/releases/2026.5#fixed-in-202657
security-advisories@github.com
https://docs.goauthentik.io/releases/2026.8#fixed-in-202682
security-advisories@github.com
https://github.com/goauthentik/authentik/commit/287ea13cdc23c378abc20a7b71c9c79…
security-advisories@github.com
https://github.com/goauthentik/authentik/commit/355d8cc3d755fbba05fc5fa90ffbcbe…
security-advisories@github.com
https://github.com/goauthentik/authentik/commit/54fac864a0b3bc00551af1908f662b3…
security-advisories@github.com
https://github.com/goauthentik/authentik/commit/984b0162711f0d1988ed33544d0a671…
security-advisories@github.com
https://github.com/goauthentik/authentik/pull/25957
security-advisories@github.com
https://github.com/goauthentik/authentik/pull/25962
security-advisories@github.com
https://github.com/goauthentik/authentik/pull/25967
security-advisories@github.com
https://github.com/goauthentik/authentik/pull/25972
security-advisories@github.com
https://github.com/goauthentik/authentik/releases/tag/version/2026.2.7
security-advisories@github.com
https://github.com/goauthentik/authentik/releases/tag/version/2026.5.7
security-advisories@github.com
https://github.com/goauthentik/authentik/releases/tag/version/2026.8.2
security-advisories@github.com
https://github.com/goauthentik/authentik/security/advisories/GHSA-cqj8-fxxf-9pg7
security-advisories@github.com