CVE-2026-105208GHSA-jh3m-cr2x-qp88
ZITADEL before 4.17.3 Session Hijacking via Forgeable IdP Intent Tokens
zitadel zitadel
CVSS
8.7HighExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.08%Chance of exploitation activity in the next 30 days, higher than 0% of CVEs. Scored 23 Oct 2026FIRST EPSS
What fixes it
- 4.17.3zitadelCVE List
A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.
Description
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.
Text from CVE List
Affected versions 3
- zitadelaffected: all versions before 4.17.3CVE List
- zitadelunaffected: 4.17.3CVE List
- zitadelaffected: all versions through 4.19.4CVE List