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CVE-2026-27840

🗓️ 26 Feb 2026 00:27:08Reported by GitHub_MType 
cve
 cve
🔗 web.nvd.nist.gov👁 58 Views

ZITADEL's opaque v2 tokens truncated to 80 chars remain valid; fix in 3.4.7 and 4.11.0 verifies user_id against session data.

Related
Detection
Affected
Refs
ReporterTitlePublishedViews
Family
attackerkb
attackerkb
CVE-2026-27840
26 Feb 202600:27
–attackerkb
circl
Circl
CVE-2026-27840
26 Feb 202602:05
–circl
cnnvd
CNNVD
ZITADEL security vulnerabilities
26 Feb 202600:00
–cnnvd
cvelist
Cvelist
CVE-2026-27840 ZITADEL's truncated opaque tokens are still valid
26 Feb 202600:27
–cvelist
euvd
EUVD
EUVD-2026-8789
27 Feb 202621:22
–euvd
github
Github Security Blog
ZITADEL's truncated opaque tokens are still valid
27 Feb 202621:22
–github
mend
Mend
CVE-2026-27840
26 Feb 202600:27
–mend
nvd
NVD
CVE-2026-27840
26 Feb 202601:16
–nvd
osv_cve
osv_cve
CVE-2026-27840 ZITADEL's truncated opaque tokens are still valid
26 Feb 202600:27
–osv_cve
osv_ghsa
osv_ghsa
GHSA-6MQ3-XMGP-PJM5 ZITADEL's truncated opaque tokens are still valid
27 Feb 202621:22
–osv_ghsa
Rows per page
NVD
Vulners
Node
OR
zitadelzitadelRange2.31.0–2.71.19
zitadelzitadelRange3.0.0–3.4.7
zitadelzitadelRange4.0.0–4.11.0
[
  {
    "vendor": "zitadel",
    "product": "zitadel",
    "versions": [
      {
        "version": ">= 4.0.0, < 4.11.0",
        "status": "affected"
      },
      {
        "version": ">= 3.0.0, < 3.4.7",
        "status": "affected"
      },
      {
        "version": ">= 2.31.0, <= 2.71.19",
        "status": "affected"
      }
    ]
  }
]

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17 Jun 2026 10:27Current
7.9High risk
Vulners AI Score7.9
CVSS 3.14.3
EPSS0.00252
58