Zitadel
CVE-2026-109373: ZITADEL 3.0.0 before 4.19.2 contains an authentication bypass vulnerability in the Login V2 UI that allows unauthenticated attackers to obtain other users' sess
CVE-2026-109373 Oct 12, 2026 Source: Vendor
ZITADEL 3.0.0 before 4.19.2 contains an authentication bypass vulnerability in the Login V2 UI that allows unauthenticated attackers to obtain other users' session tokens by forging unsigned session cookies. Attackers can guess time-ordered session IDs around a victim's sign-in and supply them with empty tokens to receive rotated tokens, taking over accounts including MFA-completed administrator sessions.
Source of record
The credited names below are quoted verbatim from the vendor's own advisory:
https://nvd.nist.gov/vuln/detail/CVE-2026-109373
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CVE-2026-109373
BR2026-0000-026925
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Credited as livio-a
CVE-2026-109373
BR2026-0000-026926
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Credited as lucasdodgson