CVE-2026-82755

The record

Use of Cache Containing Sensitive Information vulnerability in ash-project ash_authentication_oauth2_server 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 AshAuthentication.Phoenix.Oauth2Server.ProtocolRouter return tenant-specific values (issuer, authorization_endpoint, token_endpoint, jwks_uri) when a tenant is set, but sent them with Cache-Control: public, max-age=3600 and no Vary. When the tenant is derived from something other than the URL (a header or the Host) and a shared cache sits in front, the cache key is the URL alone, so a stored response for one tenant is served to another for up to an hour. Affected clients may then send authorization codes and secrets to the wrong tenant's token endpoint and validate tokens against the wrong keys. This issue affects ash_authentication_oauth2_server: from 0.1.3 before 0.3.1.

Affected packages

Related vulnerabilities

• CVE-2026-105711 GitLab has remediated an issue in GitLab CE/EE affecting all versions from 15.0 before… CWE-524
• CVE-2026-105752 vLLM is an inference and serving engine for large language models. CWE-524
• CVE-2026-94543 Next.js is a React framework for building full-stack web applications. CWE-524
• CVE-2026-94484 Next.js is a React framework for building full-stack web applications. CWE-524
• CVE-2026-93748 http-cache-semantics through 4.2.0 fails to properly validate security-zeroed cache… CWE-524
• CVE-2026-88059 Angular is a development platform for building mobile and desktop web applications using… CWE-524
• CVE-2026-84933 undici's cache interceptor does not handle the Set-Cookie response header anywhere in its… CWE-524
• CVE-2026-59903 Netty is an asynchronous, event-driven network application framework. CWE-524