Vulnerability in Zitadel
CVE-2026-105208
ZITADEL 4.x before 4.17.3 and 3.x through 3.4.15 protects IdP intent tokens with unauthenticated, malleable encryption, allowing authenticated users to tamper with their own token so it is accepted for another user's external login intent. An attacker who predicts a victim's in-flight intent identifier and wins a timing race can call /v2/idp_intents or /v2/sessions to steal the victim's IdP tokens or hijack their session.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/zitadel/zitadel/security/advisories/GHSA-jh3m-cr2x-qp88 (vendor-advisory)
- www.vulncheck.com/advisories/zitadel-before-4.17.3-session-hijacking-via-forgea… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-105208?
- CVE-2026-105208 is a high-severity vulnerability in Zitadel, classified under CWE-649. CVSS score: 7.7/10. Published 2026-10-04.
- How severe is CVE-2026-105208?
- High severity. CVSS v3 base score is 7.7 out of 10.