Incorrect Implementation of Authentication Algorithm

Overview github.com/mattermost/mattermost-server is an open source Slack-alternative in Golang and React. Affected versions of this package are vulnerable to Incorrect Implementation of Authentication Algorithm in the IsSameUser function. An attacker can gain unauthorized access to arbitrary user...

CVE-2026-27656

Mattermost versions 11.4.x = 11.4.0, 11.3.x = 11.3.1, 11.2.x = 11.2.3, 10.11.x = 10.11.11 fail to properly validate user identity in the OpenID IsSameUser comparison logic, which allows an attacker to take over arbitrary user accounts via an overly permissive substring matching flaw in the user...

CVE-2026-27656 Account Takeover via Substring Matching in OpenID Connect Authentication

Mattermost versions 11.4.x = 11.4.0, 11.3.x = 11.3.1, 11.2.x = 11.2.3, 10.11.x = 10.11.11 fail to properly validate user identity in the OpenID IsSameUser comparison logic, which allows an attacker to take over arbitrary user accounts via an overly permissive substring matching flaw in the user...

CVE-2026-27656 Account Takeover via Substring Matching in OpenID Connect Authentication

Mattermost versions 11.4.x = 11.4.0, 11.3.x = 11.3.1, 11.2.x = 11.2.3, 10.11.x = 10.11.11 fail to properly validate user identity in the OpenID IsSameUser comparison logic, which allows an attacker to take over arbitrary user accounts via an overly permissive substring matching flaw in the user...

CVE-2026-27656

Mattermost contains a vulnerability (CVE-2026-27656) where versions 11.4.x <= 11.4.0, 11.3.x <= 11.3.1, 11.2.x <= 11.2.3, and 10.11.x

CVE-2026-27656 Account Takeover via Substring Matching in OpenID Connect Authentication

Mattermost versions 11.4.x = 11.4.0, 11.3.x = 11.3.1, 11.2.x = 11.2.3, 10.11.x = 10.11.11 fail to properly validate user identity in the OpenID IsSameUser comparison logic, which allows an attacker to take over arbitrary user accounts via an overly permissive substring matching flaw in the user...

SUSE CVE-2026-28512

Pocket ID is an OIDC provider that allows users to authenticate with their passkeys to your services. From 2.0.0 to before 2.4.0, a flaw in callback URL validation allowed crafted redirecturi values containing URL userinfo @ to bypass legitimate callback pattern checks. If an attacker can trick a...

SUSE CVE-2026-28513

Pocket ID is an OIDC provider that allows users to authenticate with their passkeys to your services. Prior to 2.4.0, the OIDC token endpoint rejects an authorization code only when both the client ID is wrong and the code is expired. This allows cross-client code exchange and expired code reuse...

SUSE CVE-2026-32245

Tinyauth is an authentication and authorization server. Prior to 5.0.3, the OIDC token endpoint does not verify that the client exchanging an authorization code is the same client the code was issued to. A malicious OIDC client operator can exchange another client's authorization code using their...

SUSE CVE-2026-32246

Tinyauth is an authentication and authorization server. Prior to 5.0.3, the OIDC authorization endpoint allows users with a TOTP-pending session password verified, TOTP not yet completed to obtain authorization codes. An attacker who knows a user's password but not their TOTP secret can obtain...

PT-2026-28530

Name of the Vulnerable Software and Affected Versions OpenBao versions prior to 2.5.2 Description OpenBao, an open source identity-based secrets management system, is susceptible to Reflected Cross-Site Scripting XSS through the error description parameter during failed authentication attempts wh...

PT-2026-28529

Name of the Vulnerable Software and Affected Versions OpenBao versions prior to 2.5.2 Description A flaw in the JWT/OIDC authentication method occurs when a role is configured with the callback mode variable set to direct. In this configuration, the system fails to prompt for user confirmation...

Vikunja Allows Disabled/Locked User Accounts to Authenticate via API Tokens, CalDAV, and OpenID Connect

When a user account is disabled or locked, the status check is only enforced on the local login and JWT token refresh paths. Three other authentication paths — API tokens, CalDAV basic auth, and OpenID Connect — do not verify user status, allowing disabled or locked users to continue accessing th...

Vikjuna Bypasses Webhook SSRF Protections During OpenID Connect Avatar Download

The DownloadImage function in pkg/utils/avatar.go uses a bare http.Client with no SSRF protection when downloading user avatar images from the OpenID Connect picture claim URL. An attacker who controls their OIDC profile picture URL can force the Vikunja server to make HTTP GET requests to...

PT-2026-27989

Name of the Vulnerable Software and Affected Versions Mattermost versions 11.4.0 and earlier, 11.3.1 and earlier, 11.2.3 and earlier, 10.11.11 and earlier Description The software does not properly validate user identity within the OpenID IsSameUser comparison logic. This flaw, stemming from over...

Mattermost 安全漏洞

Mattermost is an open-source collaboration platform developed by the American company Mattermost. Vulnerabilities exist in Mattermost versions 11.4.0 and earlier 11.4.x series, 11.3.1 and earlier 11.3.x series, 11.2.3 and earlier 11.2.x series, as well as 10.11.11 and earlier 10.11.x series. Thes...

CVE-2026-33322

MinIO is a high-performance object storage system. From RELEASE.2022-11-08T05-27-07Z to before RELEASE.2026-03-17T21-25-16Z, a JWT algorithm confusion vulnerability in MinIO's OpenID Connect authentication allows an attacker who knows the OIDC ClientSecret to forge arbitrary identity tokens and...

CVE-2026-33322 MinIO: JWT Algorithm Confusion in OIDC Authentication

MinIO is a high-performance object storage system. From RELEASE.2022-11-08T05-27-07Z to before RELEASE.2026-03-17T21-25-16Z, a JWT algorithm confusion vulnerability in MinIO's OpenID Connect authentication allows an attacker who knows the OIDC ClientSecret to forge arbitrary identity tokens and...

CVE-2026-33322 MinIO: JWT Algorithm Confusion in OIDC Authentication

MinIO is a high-performance object storage system. From RELEASE.2022-11-08T05-27-07Z to before RELEASE.2026-03-17T21-25-16Z, a JWT algorithm confusion vulnerability in MinIO's OpenID Connect authentication allows an attacker who knows the OIDC ClientSecret to forge arbitrary identity tokens and...

CVE-2026-33322

MinIO is a high-performance object storage system. From RELEASE.2022-11-08T05-27-07Z to before RELEASE.2026-03-17T21-25-16Z, a JWT algorithm confusion vulnerability in MinIO's OpenID Connect authentication allows an attacker who knows the OIDC ClientSecret to forge arbitrary identity tokens and...