CVE-2026-105208
High
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.
SeverityHigh
CVSS7.7
Exploit probability—
ProductZitadel
PublishedOct 4, 2026
First seenOct 4, 2026
Weakness typeCWE-649CWE-649
How to fix
Update
- zitadel zitadel4.17.3 or later
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| zitadel zitadel | 4.0.0 ≤ v < 4.17.3, 3.0.0 ≤ v ≤ 3.4.15 | 4.17.3 |
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