Vulnerability details
CVE-2026-109372
zitadel zitadel
ZITADEL 3.0.0 before 4.19.2 Account Takeover via SAML Identity-Provider Confusion
CVSS 4.0
9.3Critical
Official description
ZITADEL 4.x before 4.19.2 and 3.x through 3.4.15 contains an authentication bypass in the SAML identity-provider intent callback, which verifies the assertion signature using the provider named in the request URL but resolves the user from the login intent without checking they match. Attackers with organization-administrator permission can register a SAML provider with their own signing key to obtain authenticated sessions as any user linked to another SAML provider on the instance, including in other organizations.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.3Critical | 4.0 | CVEProject cvelistV5 (CNA) (VulnCheck) | CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N |
| 8.7High | 3.1 | CVEProject cvelistV5 (CNA) (VulnCheck) | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N |
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
- 22 · Low
Exploit prediction (EPSS)
0.37%
Probability of exploitation in 30 days
31%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-287Improper Authentication