CVE-2026-28735 GitHub OAuth Scope Validation

Mattermost versions 11.6.x = 11.6.0, 11.5.x = 11.5.3, 11.4.x = 11.4.4, 10.11.x = 10.11.14 fail to validate the OAuth token scope on the callback which allows an authenticated Mattermost user to gain access to private repositories via modifying the scope parameter in the GitHub authorization URL...

CVE-2026-28735

Mattermost versions 11.6.x = 11.6.0, 11.5.x = 11.5.3, 11.4.x = 11.4.4, 10.11.x = 10.11.14 fail to validate the OAuth token scope on the callback which allows an authenticated Mattermost user to gain access to private repositories via modifying the scope parameter in the GitHub authorization URL...

CVE-2026-43886

Outline is a service that allows for collaborative documentation. From 0.84.0 to 1.6.1, a logic error in OAuthInterface.validateScope uses Array.some to validate requested OAuth scopes, causing the function to accept the entire scope array if any single scope is valid. An attacker can smuggle the...

CVE-2026-43886 Outline: OAuth Scope Validation Logic Error Allows Privilege Escalation to Wildcard API Access

Outline is a service that allows for collaborative documentation. From 0.84.0 to 1.6.1, a logic error in OAuthInterface.validateScope uses Array.some to validate requested OAuth scopes, causing the function to accept the entire scope array if any single scope is valid. An attacker can smuggle the...

CVE-2026-43886

Outline (0.84.0–1.6.1) suffers a logic error in OAuthInterface.validateScope() that uses Array.some() to validate requested scopes, causing any valid scope to validate the whole requested scope array and enable a wildcard via scope=read *. This can escalate a read‑only token to full unrestricted ...