CVE-2026-109373
ZITADEL 3.0.0 before 4.19.2 Account Takeover via Unsigned Login V2 Session Cookie
CVSS Score
8.1
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-441 |
| Vendor | zitadel |
| Product | zitadel |
| Published | Oct 12, 2026 |
Stay Ahead of the Next One
Get instant alerts for zitadel zitadel
Be the first to know when new high vulnerabilities affecting zitadel zitadel are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
zitadel / zitadel
3.0.0 < 4.19.2
References
Credits
livio-a 🔍 lucasdodgson