CVE-2026-56665Network attack vector

Indefinite authentication via omitted JWT expiration claim

Published Jul 10, 2026 · Updated Jul 10, 2026

JWT validation in ZITADEL 3.0.0-rc.1 through 3.4.11 and 4.0.0-rc.1 through 4.15.1 allows remote authenticated users indefinite access. The validateToken path in internal/idp/providers/jwt/session.go calls the expiration check only when exp is present, so omission silently skips rejection. Exploitation requires a token from a trusted external issuer without exp; ZITADEL then accepts that credential with no automatic expiration window.

CVSS severity4.2
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

JWT validation in ZITADEL 3.0.0-rc.1 through 3.4.11 and 4.0.0-rc.1 through 4.15.1 allows remote authenticated users indefinite access. The validateToken path in internal/idp/providers/jwt/session.go calls the expiration check only when exp is present, so omission silently skips rejection. Exploitation requires a token from a trusted external issuer without exp; ZITADEL then accepts that credential with no automatic expiration window.

The record

CVE
CVE-2026-56665
Published
Jul 10, 2026
Updated
Jul 10, 2026
Vendor
ZITADEL
Product
ZITADEL
Classifications
CWE-613, T1078
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 3.4.12
  2. Affected versionversion=>= 4.0.0-rc.1, < 4.15.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

ZITADEL · ZITADELversion=< 3.4.12; version=>= 4.0.0-rc.1, < 4.15.2

Published CVSS scores

4.2GitHubCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-613Insufficient Session Expiration
T1078Valid Accounts

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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