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GHSA-v77h-2w3m-94hx

MediumCVSS 4.2 / 10
Published Sep 11, 2026·Last modified Sep 11, 2026
Affected Components(2)
Go logogithub.com/zitadel/zitadel
< 3.4.12
Go logogithub.com/zitadel/zitadel
4.0.0-rc.1 – 4.15.2
Description

Summary

A token lifecycle validation vulnerability was discovered in ZITADEL's external JWT Identity Provider (IdP) implementation Specifically, within the validation pipeline, if an incoming JWT omits the exp claim entirely, the expiration block is silently skipped rather than rejected. The token is treated as valid forever.

Per the OIDC Core 1.0 specification, identity token validation pipelines must strictly handle and enforce session expiration. ZITADEL's silent acceptance of tokens missing these temporal constraints compromises session integrity.

Impact

An attacker in possession of a token lacking an exp claim holds a permanent credential with no automatic expiration or revocation window.

Affected Versions

Systems running one of the following versions are affected:

  • 4.x: 4.0.0 through 4.15.1 (including RC versions)
  • 3.x: 3.0.0 through 3.4.11 (including RC versions)

Patches

The vulnerability has been addressed in the latest releases. ZITADEL now explicitly rejects tokens that lack an exp claim.

Workarounds

The recommended solution is to update ZITADEL to a patched version.

If an immediate upgrade is not feasible, ensure at the upstream Identity Provider level that an external IdP explicitly includes the exp claim in all signed JWTs.

Publication Note

This issue was originally disclosed as part of a unified security bulletin published under GHSA-wxg7-w2v3-w38g. To satisfy CVE Numbering Authority regulations regarding independently fixable logic flaws, the missing token expiration validation (exp) has been moved into this separate tracking entry so a distinct CVE ID can be correctly mapped to it.

Questions

If there are any questions or comments about this advisory, send an email to security@zitadel.com

Credits

ZITADEL thanks Android-Login-Analysis, Jason Zhou and Pedro Giglioti for reporting this vulnerability.

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Risk Scores
Base Score
4.2

The vulnerability can be exploited over the network without needing physical access. It is difficult for an attacker to exploit this vulnerability and may require special conditions. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a low impact on the confidentiality of the information. There is a low impact on the integrity of the data.

Threat Intelligence
3.9

Limited exploitation activity has been observed. Close monitoring and planned remediation are recommended.

EPSS
N/A

Probability that this vulnerability will be exploited in the wild within the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

Related Vulnerabilities
  • CVE-2026-56665
    Alias
  • EUVD-2026-42963
    Alias

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