SiYuan Vulnerable to Cross-Origin WebSocket Hijacking via Authentication Bypass — Unauthenticated Information Disclosure

Cross-Origin WebSocket Hijacking via Authentication Bypass — Unauthenticated Information Disclosure Summary SiYuan's WebSocket endpoint /ws allows unauthenticated connections when specific URL parameters are provided ?app=siyuan&id=auth&type=auth. This bypass, intended for the login page to keep...

EUVD-2026-12425

Mattermost versions 11.3.x = 11.3.0, 11.2.x = 11.2.2, 10.11.x = 10.11.10 fail to validate team-specific uploadfile permissions which allows a guest user to post files in channels where they lack uploadfile permission via uploading files in a team where they have permission and reusing the file...

Incorrect Authorization

Overview github.com/mattermost/mattermost/server/channels/app is a private-cloud Slack alternative Affected versions of this package are vulnerable to Incorrect Authorization via the upload process. An attacker can bypass team-specific file upload restrictions by uploading files in a team where...

Incorrect Authorization

Overview Affected versions of this package are vulnerable to Incorrect Authorization via the upload process. An attacker can bypass team-specific file upload restrictions by uploading files in a team where they have permission and reusing the file metadata in a POST request to a different team...

Mattermost allows attackers to spoof permalink embeds

Mattermost versions 11.3.x = 11.3.0, 11.2.x = 11.2.2, 10.11.x = 10.11.10 fail to sanitize client-supplied post metadata which allows an authenticated attacker to spoof permalink embeds impersonating other users via crafted PUT requests to the post update API endpoint. Mattermost Advisory ID:...

Origin Validation Error

Overview github.com/mattermost/mattermost/server/channels/app is a private-cloud Slack alternative Affected versions of this package are vulnerable to Origin Validation Error via the post update API endpoint when client-supplied post metadata is not properly sanitized. An attacker can impersonate...

Origin Validation Error

Overview Affected versions of this package are vulnerable to Origin Validation Error via the post update API endpoint when client-supplied post metadata is not properly sanitized. An attacker can impersonate other users and spoof permalink embeds by sending crafted PUT requests. Remediation Upgra...

EUVD-2026-12407

Mattermost versions 11.3.x = 11.3.0, 11.2.x = 11.2.2, 10.11.x = 10.11.10 fail to sanitize client-supplied post metadata which allows an authenticated attacker to spoof permalink embeds impersonating other users via crafted PUT requests to the post update API endpoint.. Mattermost Advisory ID:...

CVE-2026-4265

Mattermost versions 11.3.x = 11.3.0, 11.2.x = 11.2.2, 10.11.x = 10.11.10 fail to validate team-specific uploadfile permissions which allows a guest user to post files in channels where they lack uploadfile permission via uploading files in a team where they have permission and reusing the file...

CVE-2026-2457

Mattermost versions 11.3.x = 11.3.0, 11.2.x = 11.2.2, 10.11.x = 10.11.10 fail to sanitize client-supplied post metadata which allows an authenticated attacker to spoof permalink embeds impersonating other users via crafted PUT requests to the post update API endpoint.. Mattermost Advisory ID:...

CVE-2026-32775

libexif through 0.6.25 has a flaw in decoding MakerNotes. If the exifmnotedatagetvalue function gets passed in a 0 size, the passed in-buffer would be overwritten due to an integer underflow...

CVE-2026-4265 Guest user can upload files without permission across teams

Mattermost versions 11.3.x = 11.3.0, 11.2.x = 11.2.2, 10.11.x = 10.11.10 fail to validate team-specific uploadfile permissions which allows a guest user to post files in channels where they lack uploadfile permission via uploading files in a team where they have permission and reusing the file...

CVE-2026-4265

Mattermost versions 11.3.x = 11.3.0, 11.2.x = 11.2.2, 10.11.x = 10.11.10 fail to validate team-specific uploadfile permissions which allows a guest user to post files in channels where they lack uploadfile permission via uploading files in a team where they have permission and reusing the file...

CVE-2026-2457 WebSocket Message Spoofing via Permalink Embed Manipulation

Mattermost versions 11.3.x = 11.3.0, 11.2.x = 11.2.2, 10.11.x = 10.11.10 fail to sanitize client-supplied post metadata which allows an authenticated attacker to spoof permalink embeds impersonating other users via crafted PUT requests to the post update API endpoint.. Mattermost Advisory ID:...

CVE-2026-2457 WebSocket Message Spoofing via Permalink Embed Manipulation

Mattermost versions 11.3.x = 11.3.0, 11.2.x = 11.2.2, 10.11.x = 10.11.10 fail to sanitize client-supplied post metadata which allows an authenticated attacker to spoof permalink embeds impersonating other users via crafted PUT requests to the post update API endpoint.. Mattermost Advisory ID:...

CVE-2026-32775

libexif through 0.6.25 has a flaw in decoding MakerNotes. If the exifmnotedatagetvalue function gets passed in a 0 size, the passed in-buffer would be overwritten due to an integer underflow...

PT-2026-51236

Name of the Vulnerable Software and Affected Versions SiYuan versions prior to 3.6.1 Description SiYuan fails to sanitize package metadata and README content within the Bazaar marketplace. This allows malicious authors to inject arbitrary HTML and JavaScript into the displayName, description, or...

PT-2026-51238

Name of the Vulnerable Software and Affected Versions SiYuan versions prior to 3.6.1 Description SiYuan fails to sanitize package metadata and README content within the Bazaar marketplace. This allows malicious authors to inject arbitrary HTML and JavaScript through the displayName, description, ...

PT-2026-25775

Name of the Vulnerable Software and Affected Versions FastMCP versions prior to 2.14.2 Description FastMCP, a framework for building MCP applications, does not properly validate the resource parameter submitted by the client during authorization and token requests. Instead of issuing tokens...

CVE-2026-32717: Incorrect Authorization

AnythingLLM is an application that turns pieces of content into context that any LLM can use as references during chatting. In 1.11.1 and earlier, in multi-user mode, AnythingLLM blocks suspended users on the normal JWT-backed session path, but it does not block them on the browser extension API...