CVE-2026-54603

OAuth2 is a Ruby wrapper for the OAuth 2.0 and 2.1 authorization frameworks, including OpenID Connect OIDC. From 0.4.0 to 2.0.21, a protocol-relative redirect Location returned to OAuth2::Clientrequest overrides the request authority, so the bearer Authorization header is sent to an...

CVE-2026-54603 OAuth2::Client#request: Protocol-relative redirect Location overrides authority, leaking bearer Authorization to attacker host

OAuth2 is a Ruby wrapper for the OAuth 2.0 and 2.1 authorization frameworks, including OpenID Connect OIDC. From 0.4.0 to 2.0.21, a protocol-relative redirect Location returned to OAuth2::Clientrequest overrides the request authority, so the bearer Authorization header is sent to an...

Cross-site Scripting (XSS)

Overview Affected versions of this package are vulnerable to Cross-site Scripting XSS via the wap/authorize.ftl consent template in the OAuth2/OIDC consent page. An attacker can execute arbitrary JavaScript in the OpenAM origin by sending a victim with an active session a crafted display=wap...

LiteLLM: MCP Authentication Bypass via OAuth2 Passthrough Fallback

Impact LiteLLM's MCP Streamable HTTP endpoint could allow an unauthenticated attacker to establish an authenticated MCP session using an arbitrary Bearer token. The MCP auth handler supported OAuth2 passthrough for upstream MCP servers, but the fallback path could replace failed LiteLLM key...

@0xlimao/n8n-nodes-ethereum (>=1.0.0, <=1.0.1), @aayshian/n8n-aisensy-ay19 (0.0.1) +112 more potentially affected by CVE-2026-65594 via @n8n/client-oauth2 (>=1.0.0, <=1.11.1)

@n8n/client-oauth2 NPM version =1.0.0, =1.0.0, =0.0.1, =1.0.0, =0.0.1, =0.0.1, =0.3.6, =0.1.0, =1.0.0, =0.1.4, =1.1.3, =1.1.6 and more Source cves: CVE-2026-65594 Source advisory: SNYK:JS-N8NCLIENTOAUTH2-18322332...

@n8n/backend-test-utils (1.30.0), @n8n/db (1.30.0) +3 more potentially affected by CVE-2026-65594 via @n8n/client-oauth2 (1.12.0)

@n8n/client-oauth2 NPM version 1.12.0 is affected by a known vulnerability. The following packages have a transitive dependency on @n8n/client-oauth2 and may be impacted: - @n8n/backend-test-utils 1.30.0 - @n8n/db 1.30.0 - @n8n/scheduler 0.2.0 - @n8n/task-runner 2.30.0 - n8n-core 2.30.0 Source...

Important: Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update

An update for Red Hat Hardened Images RPMs is now available. This update includes the following RPMs: oauth2-proxy: oauth2-proxy-7.15.3-0.3.hum1 aarch64, x8664 oauth2-proxy-7.15.3-0.3.hum1.src src Security Fixes: oauth2-proxy: CVE-2026-56852...

Server-side Request Forgery (SSRF)

Overview Affected versions of this package are vulnerable to Server-side Request Forgery SSRF in the Open function, which uses raw http.Get and os.Open without proper host or scheme validation. An attacker can access internal network resources, cloud metadata endpoints, or read arbitrary local...

Incorrect Authorization

Overview Affected versions of this package are vulnerable to Incorrect Authorization through the handleOAuth2SignIn. An attacker can regain access to a previously deactivated account by signing in through an OAuth2 authentication source that does not issue refresh tokens. This allows the attacker...

GHSA-VRHC-JJFC-M3M3 Gitea: OAuth2 sign-in reactivates an administrator-deactivated account on auth sources without refresh tokens (incomplete fix of #38009)

Description Gitea's OAuth2 sign-in callback reactivates a deactivated user account IsActive=false when the user signs in through an authentication source that does not issue refresh tokens notably GitHub, and any OIDC/OAuth2 source configured without offlineaccess. PR 38009 added a gate intended ...

Incorrect Authorization

Overview Affected versions of this package are vulnerable to Incorrect Authorization through the handleOAuth2SignIn. An attacker can regain access to a previously deactivated account by signing in through an OAuth2 authentication source that does not issue refresh tokens. This allows the attacker...

Incorrect Authorization

Overview Affected versions of this package are vulnerable to Incorrect Authorization through the repo.Home handler when a personal access token or OAuth2 token lacking the required scope is used. An attacker can access private repository content, including the README, root file and directory...

Incorrect Authorization

Overview Affected versions of this package are vulnerable to Incorrect Authorization through the repo.Home handler when a personal access token or OAuth2 token lacking the required scope is used. An attacker can access private repository content, including the README, root file and directory...

Incorrect Authorization

Overview Affected versions of this package are vulnerable to Incorrect Authorization through the repo.Home handler when a personal access token or OAuth2 token lacking the required scope is used. An attacker can access private repository content, including the README, root file and directory...

Server-side Request Forgery (SSRF)

Overview Affected versions of this package are vulnerable to Server-side Request Forgery SSRF via the oauth2UpdateAvatarIfNeed function. An attacker can cause the server to make arbitrary outbound HTTP GET requests by supplying a crafted avatar URL through the OAuth2/OIDC picture claim. This can...

GHSA-X77V-Q46J-393G Gitea: Blind SSRF in OAuth2 avatar synchronization via unvalidated OIDC picture claim

Summary When oauth2client UPDATEAVATAR = true is enabled, Gitea fetches the avatar URL received from an OAuth2/OIDC provider using Go's default HTTP client. The URL comes from the user's OAuth/OIDC avatar value, commonly the OIDC picture claim. The affected code path calls http.Geturl without...

Server-side Request Forgery (SSRF)

Overview Affected versions of this package are vulnerable to Server-side Request Forgery SSRF via the oauth2UpdateAvatarIfNeed function. An attacker can cause the server to make arbitrary outbound HTTP GET requests by supplying a crafted avatar URL through the OAuth2/OIDC picture claim. This can...

Gitea: Blind SSRF in OAuth2 avatar synchronization via unvalidated OIDC picture claim

Summary When oauth2client UPDATEAVATAR = true is enabled, Gitea fetches the avatar URL received from an OAuth2/OIDC provider using Go's default HTTP client. The URL comes from the user's OAuth/OIDC avatar value, commonly the OIDC picture claim. The affected code path calls http.Geturl without...

PT-2026-61821

A vulnerability was found in trinodb trino 481. Affected is an unknown function of the file core/trino-main/src/main/java/io/trino/server/ExternalUriInfo.java of the component OAuth2/OIDC. Performing a manipulation of the argument redirect uri results in open redirect. It is possible to initiate...

EUVD-2026-45417

A security vulnerability has been detected in django-oauth django-oauth-toolkit 3.3.0. This issue affects the function loadidtoken of the file oauth2provider/oauth2validators.py. The manipulation leads to session expiration. The attack can be initiated remotely. The project was informed of the...