Mattermost doesn't validate the Host header when constructing response URLs for custom slash command

Mattermost versions 11.5.x = 11.5.1, 10.11.x = 10.11.13 fail to validate the Host header when constructing response URLs for custom slash commands which allows an authenticated attacker to redirect slash command responses to an attacker-controlled server via a spoofed Host header.. Mattermost...

GHSA-VQP5-2MRP-QQXG Mattermost doesn't validate the Host header when constructing response URLs for custom slash command

Mattermost versions 11.5.x = 11.5.1, 10.11.x = 10.11.13 fail to validate the Host header when constructing response URLs for custom slash commands which allows an authenticated attacker to redirect slash command responses to an attacker-controlled server via a spoofed Host header.. Mattermost...

CVE-2026-6333

Mattermost versions 11.5.x = 11.5.1, 10.11.x = 10.11.13 fail to validate the Host header when constructing response URLs for custom slash commands which allows an authenticated attacker to redirect slash command responses to an attacker-controlled server via a spoofed Host header.. Mattermost...

CVE-2026-6333 SSRF via Host Header Spoofing in Custom Slash Commands

Mattermost versions 11.5.x = 11.5.1, 10.11.x = 10.11.13 fail to validate the Host header when constructing response URLs for custom slash commands which allows an authenticated attacker to redirect slash command responses to an attacker-controlled server via a spoofed Host header.. Mattermost...

CVE-2026-6333

Mattermost versions 11.5.x = 11.5.1, 10.11.x = 10.11.13 fail to validate the Host header when constructing response URLs for custom slash commands which allows an authenticated attacker to redirect slash command responses to an attacker-controlled server via a spoofed Host header.. Mattermost...

EUVD-2026-30755

Mattermost versions 11.5.x = 11.5.1, 10.11.x = 10.11.13 fail to validate the Host header when constructing response URLs for custom slash commands which allows an authenticated attacker to redirect slash command responses to an attacker-controlled server via a spoofed Host header.. Mattermost...

CVE-2026-6333 SSRF via Host Header Spoofing in Custom Slash Commands

Mattermost versions 11.5.x = 11.5.1, 10.11.x = 10.11.13 fail to validate the Host header when constructing response URLs for custom slash commands which allows an authenticated attacker to redirect slash command responses to an attacker-controlled server via a spoofed Host header.. Mattermost...

CVE-2026-6333

Mattermost versions 11.5.x <= 11.5.1 and 10.11.x

CVE-2026-6333 SSRF via Host Header Spoofing in Custom Slash Commands

Mattermost versions 11.5.x = 11.5.1, 10.11.x = 10.11.13 fail to validate the Host header when constructing response URLs for custom slash commands which allows an authenticated attacker to redirect slash command responses to an attacker-controlled server via a spoofed Host header.. Mattermost...

PT-2026-41656

Name of the Vulnerable Software and Affected Versions Mattermost versions 11.5.0 through 11.5.1 Mattermost versions 10.11.0 through 10.11.13 Description An issue exists where the software fails to validate the Host header when constructing response URLs for custom slash commands. This allows an...

Mattermost 代码问题漏洞

Mattermost is an open-source collaboration platform developed by the American company Mattermost. Versions of Mattermost such as 11.5.1 and earlier 11.5.x series as well as 10.11.13 and earlier 10.11.x series have code vulnerabilities. These vulnerabilities stem from the lack of validation of the...

OESA-2026-2339 libsoup3 security update

Libsoup is an HTTP library implementation in C. It was originally part of a SOAP Simple Object Access Protocol implementation called Soup, but the SOAP and non-SOAP parts have now been split into separate packages. Security Fixes: A flaw was found in the asynchronous message queue handling of the...

OESA-2026-2338 libsoup3 security update

Libsoup is an HTTP library implementation in C. It was originally part of a SOAP Simple Object Access Protocol implementation called Soup, but the SOAP and non-SOAP parts have now been split into separate packages. Security Fixes: A flaw was found in the asynchronous message queue handling of the...

OESA-2026-2337 libsoup3 security update

Libsoup is an HTTP library implementation in C. It was originally part of a SOAP Simple Object Access Protocol implementation called Soup, but the SOAP and non-SOAP parts have now been split into separate packages. Security Fixes: A flaw was found in the asynchronous message queue handling of the...

Weak Password Recovery Mechanism for Forgotten Password

Overview apostrophe is a content management system CMS for Node.js. It supports in-context editing, schema-driven content types, flexible widgets and a great deal more. This module contains everything necessary to build a website with ApostropheCMS. Affected versions of this package are vulnerabl...

GHSA-GF43-24G3-5HW2 Apostrophe has a Weak Password Recovery Mechanism for Forgotten Password and Improper Input Validation

Summary ApostropheCMS's password reset flow constructs the reset URL using req.hostname, which is derived directly from the attacker-controlled HTTP Host header when apos.baseUrl is not explicitly configured. An unauthenticated attacker who knows a victim's email address can send a crafted reset...

Apostrophe has a Weak Password Recovery Mechanism for Forgotten Password and Improper Input Validation

Summary ApostropheCMS's password reset flow constructs the reset URL using req.hostname, which is derived directly from the attacker-controlled HTTP Host header when apos.baseUrl is not explicitly configured. An unauthenticated attacker who knows a victim's email address can send a crafted reset...

CVE-2026-42559

RMCP is an official Rust SDK for the Model Context Protocol. Prior to version 1.4.0, the rmcp crate's Streamable HTTP server transport crates/rmcp/src/transport/streamablehttpserver/ did not validate the incoming Host header. This allowed a malicious public website, via a DNS rebinding attack, to...

EUVD-2026-30292

RMCP is an official Rust SDK for the Model Context Protocol. Prior to version 1.4.0, the rmcp crate's Streamable HTTP server transport crates/rmcp/src/transport/streamablehttpserver/ did not validate the incoming Host header. This allowed a malicious public website, via a DNS rebinding attack, to...

CVE-2026-42559

RMCP is an official Rust SDK for the Model Context Protocol. Prior to version 1.4.0, the rmcp crate's Streamable HTTP server transport crates/rmcp/src/transport/streamablehttpserver/ did not validate the incoming Host header. This allowed a malicious public website, via a DNS rebinding attack, to...