High severity8.1NVD Advisory· Published Oct 12, 2026· Updated Oct 12, 2026

CVE-2026-109373

Description

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Zitadel/Zitadelllm-fuzzy
Range: <4.19.2

Patches

Vulnerability mechanics

References

github.com/zitadel/zitadel/security/advisories/GHSA-jh92-5mrj-p2w2nvd
www.vulncheck.com/advisories/zitadel-3.0.0-before-4.19.2-account-takeover-via-unsigned-login-v2-session-cookienvd

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patch	-0.070
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