CVE-2026-82755

ash_authentication_oauth2_server (ash-project, versions 0.1.3 through before 0.3.1) suffers from a cache-poisoning issue in its RFC 8414 / RFC 9728 metadata endpoints (AshAuthentication.Phoenix.Oauth2Server.ProtocolRouter). When a tenant is derived from a header or Host value rather than the URL,...

CVE-2026-82755 ash_authentication_oauth2_server serves tenant-specific OAuth metadata as publicly cacheable without Vary, enabling cross-tenant confusion

Use of Cache Containing Sensitive Information vulnerability in ash-project ashauthenticationoauth2server allows a shared HTTP cache to serve one tenant's OAuth discovery metadata to another tenant's clients. The RFC 8414 and RFC 9728 metadata endpoints in...

CVE-2026-82755 ash_authentication_oauth2_server serves tenant-specific OAuth metadata as publicly cacheable without Vary, enabling cross-tenant confusion

Use of Cache Containing Sensitive Information vulnerability in ash-project ashauthenticationoauth2server allows a shared HTTP cache to serve one tenant's OAuth discovery metadata to another tenant's clients. The RFC 8414 and RFC 9728 metadata endpoints in...

CVE-2026-82755 ash_authentication_oauth2_server serves tenant-specific OAuth metadata as publicly cacheable without Vary, enabling cross-tenant confusion

Use of Cache Containing Sensitive Information vulnerability in ash-project ashauthenticationoauth2server allows a shared HTTP cache to serve one tenant's OAuth discovery metadata to another tenant's clients. The RFC 8414 and RFC 9728 metadata endpoints in...

EEF-CVE-2026-82755 ash_authentication_oauth2_server serves tenant-specific OAuth metadata as publicly cacheable without Vary, enabling cross-tenant confusion

Summary Use of Cache Containing Sensitive Information vulnerability in ash-project ashauthenticationoauth2server allows a shared HTTP cache to serve one tenant's OAuth discovery metadata to another tenant's clients. The RFC 8414 and RFC 9728 metadata endpoints in...

ANT-2026-A5580GNM · xdao · logic-error / cross-tenant-confusion

logic-error high Severity Claude high · Security research firm high · Maintainer - Discovered by Claude Mythos Preview REPORT Anthropic's analysis, sealed at approval. Disclosure to the maintainer was performed by Trail of Bits. ANT-2026-A5580GNM: XDAO CrowdfundingModule: cross-tenant token...