Vulnerability details
CVE-2026-109373
zitadel zitadel
ZITADEL 3.0.0 before 4.19.2 Account Takeover via Unsigned Login V2 Session Cookie
CVSS 4.0
9.2Critical
Official 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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.2Critical | 4.0 | CVEProject cvelistV5 (CNA) (VulnCheck) | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N |
| 8.1High | 3.1 | CVEProject cvelistV5 (CNA) (VulnCheck) | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| zitadel | zitadel | 3.0.0 ≤ v < 4.19.2 | CVEProject cvelistV5 (CNA) |
References and advisories
2
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Details
- Published
- 2026-10-12
- Last updated
- 2026-10-13
- State
- Published
- Assigner (CNA)
- VulnCheck
- Kolun priority
- 23 · Low
Exploit prediction (EPSS)
0.42%
Probability of exploitation in 30 days
36.8%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-441Unintended Proxy or Intermediary ('Confused Deputy')