CVE-2026-59208

CVE-2026-59208 affects n8n, an open-source workflow automation platform. Vulnerability: when an n8n instance is configured with more than one trusted token-exchange issuer, it could resolve external identities to local accounts using only the JWT sub claim and ignore the iss claim. This allows an...

Access Control Bypass

Overview Affected versions of this package are vulnerable to Access Control Bypass due to improper enforcement of the PKCE S256 challenge during the OAuth2 token exchange process. An attacker can obtain access tokens without providing the expected code verifier by bypassing the intended...

Replay Attack

Overview Affected versions of this package are vulnerable to Replay Attack due to improper enforcement of OAuth2 authorization code expiry and single-use requirements in the authorization code process. An attacker can gain unauthorized access by reusing valid authorization codes during the token...

CVE-2026-26247

Gitea versions before 1.25.5 do not persist the OAuth2 PKCE S256 challenge method correctly during authorization, allowing token exchange without the expected verifier check...

CVE-2026-26232

Gitea versions before 1.25.5 do not consistently enforce OAuth2 authorization code expiry and single-use behavior during token exchange...

EUVD-2026-41628

Gitea versions before 1.25.5 do not consistently enforce OAuth2 authorization code expiry and single-use behavior during token exchange...

CVE-2026-26232

Gitea versions before 1.25.5 do not consistently enforce OAuth2 authorization code expiry and single-use behavior during token exchange...

CVE-2026-26247 Gitea OAuth2 PKCE S256 challenges are not enforced during token exchange

Gitea versions before 1.25.5 do not persist the OAuth2 PKCE S256 challenge method correctly during authorization, allowing token exchange without the expected verifier check...

CVE-2026-26232 Gitea OAuth2 authorization codes lack expiry and reuse enforcement

Gitea versions before 1.25.5 do not consistently enforce OAuth2 authorization code expiry and single-use behavior during token exchange...

BIT-ENVOY-2026-48090 Envoy HTTP: OAuth2 filter late async token completion after stream teardown (UAF / crash risk)

Envoy is an open source edge and service proxy designed for cloud-native applications. From 1.37.0 until 1.37.5 and 1.38.3, the HTTP OAuth2 filter envoy.filters.http.oauth2 can leave an in-flight async token exchange attached to a downstream stream that has already been torn down. A late...

GO-2026-5231 Dex: Token-exchange endpoint is missing AllowedConnectors enforcement in github.com/dexidp/dex

Dex: Token-exchange endpoint is missing AllowedConnectors enforcement in github.com/dexidp/dex...

CVE-2026-47386

NocoDB is software for building databases as spreadsheets. Prior to 2026.05.1, two concurrent token-exchange requests using the same OAuth authorization code could each mint a distinct valid accesstoken, refreshtoken pair, breaking the single-use guarantee that PKCE relies on. This vulnerability ...

CVE-2026-47386

NocoDB is software for building databases as spreadsheets. Prior to 2026.05.1, two concurrent token-exchange requests using the same OAuth authorization code could each mint a distinct valid accesstoken, refreshtoken pair, breaking the single-use guarantee that PKCE relies on. This vulnerability ...

GHSA-7QJX-GP9H-65QJ Dex: Token-exchange endpoint is missing AllowedConnectors enforcement

Summary server/handlers.go::handleTokenExchange lines 1804-1893 does not call isConnectorAllowedclient.AllowedConnectors, connID before issuing tokens, while sibling handlers do. This is a per-client connector ACL gap on the token-exchange endpoint; the redirect-flow paths enforce the same field...

Dex: Token-exchange endpoint is missing AllowedConnectors enforcement

Summary server/handlers.go::handleTokenExchange lines 1804-1893 does not call isConnectorAllowedclient.AllowedConnectors, connID before issuing tokens, while sibling handlers do. This is a per-client connector ACL gap on the token-exchange endpoint; the redirect-flow paths enforce the same field...

Incorrect Authorization

Overview Affected versions of this package are vulnerable to Incorrect Authorization in the handleTokenExchange function. An attacker can gain unauthorized access to restricted resources by exploiting the lack of enforcement of allowed connectors when exchanging tokens. This is only exploitable i...

NocoDB: OAuth Authorization Code Race Condition

Summary Two concurrent token-exchange requests using the same OAuth authorization code could each mint a distinct valid accesstoken, refreshtoken pair, breaking the single-use guarantee that PKCE relies on. Details The token-exchange flow read isused and called markAsUsed as an unconditional upda...

Race Condition

Overview nocodb is a NocoDB Affected versions of this package are vulnerable to Race Condition through a race condition in the OAuth token exchange. An attacker can obtain multiple valid token pairs by making concurrent requests using the same authorization code and PKCE verifier. Remediation...

CVE-2026-9097

Casdoor versions 2.362.0 and earlier do not verify that a JWT used for token exchange is still active. The GetTokenExchangeToken function in object/tokenoauth.go validates the JWT signature and parses its claims, but never queries the Token table to verify whether the subject token has been revok...

CVE-2026-9094

Casdoor versions 2.362.0 and earlier contain a vulnerability enabling cross-organization token exchange. The GetTokenExchangeToken function in object/tokenoauth.go validates JWT signatures but does not verify that the token's user belongs to the same organization as the target application. This c...