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OpenAdvisories
High · 8.7 CVE-2026-116835 EUVD-2026-124401GHSA-x27r-mfxr-pcpj

In affected versions of Octopus Server, insufficient validation of custom claims on OIDC accounts allowed a user with permission to edit ac…

Published Nov 12, 2026 · Assigned by Octopus

Description

In affected versions of Octopus Server, insufficient validation of custom claims on OIDC accounts allowed a user with permission to edit accounts to cause Octopus Server to issue signed OIDC tokens that impersonate a different project. This could grant access to external systems, such as cloud providers or other Octopus instances, that trust that project's identity.

Affected products

VendorProductAffectedFixed
Octopus Deploy Octopus Server 2026.3.0 <2026.3.15894 —
Octopus Deploy Octopus Server 2025.3.11571 <2026.2.13503 —

Advisories 1

References