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googleapis/mcp-toolbox: authentication bypass vulnerability in the generic opaque token validation path (validateOpaqueToken)

🗓️ 18 Jun 2026 15:32:01Reported by GitHub Advisory DatabaseType 
github
 github
🔗 github.com👁 3 Views

Authentication bypass in googleapis/mcp-toolbox's opaque token validation when issuer field is omitted.

Related
Detection
Refs
ReporterTitlePublishedViews
Family
ATTACKERKB
CVE-2026-11718
18 Jun 202611:52
attackerkb
Circl
CVE-2026-11718
18 Jun 202613:13
circl
CVE
CVE-2026-11718
18 Jun 202611:52
cve
Cvelist
CVE-2026-11718
18 Jun 202611:52
cvelist
EUVD
EUVD-2026-37880
18 Jun 202611:52
euvd
NVD
CVE-2026-11718
18 Jun 202614:17
nvd
OSV
GHSA-WCPR-6G7X-P44R googleapis/mcp-toolbox: authentication bypass vulnerability in the generic opaque token validation path (validateOpaqueToken)
18 Jun 202615:32
osv
Positive Technologies
PT-2026-50660
18 Jun 202600:00
ptsecurity
Vulnrichment
CVE-2026-11718
18 Jun 202611:52
vulnrichment
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19 Jun 2026 16:59Current
5.9Medium risk
Vulners AI Score5.9
CVSS 49.3
EPSS0.00204
SSVC
3