CVE-2026-105208 ZITADEL before 4.17.3 Session Hijacking via Forgeable IdP Intent Tokens
Authenticated users can hijack sessions or steal IdP tokens by tampering with intent tokens, requiring an upgrade to ZITADEL.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-105208?
CVE-2026-105208 is a high-severity authentication bypass vulnerability in zitadel, published on 4 Oct 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-649
Which versions are affected by CVE-2026-105208?
How do I fix CVE-2026-105208?
No fix has been published for CVE-2026-105208 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-105208 being exploited?
There is no known exploitation of CVE-2026-105208 in the wild and no public exploit code.
Sources
Also known as GHSA-jh3m-cr2x-qp88, GHSA-xv85-7fx2-46j9.