CVE-2026-4053

Mattermost versions 11.5.x = 11.5.1, 10.11.x = 10.11.13 fail to enforce the PostEditTimeLimit on non-message post fields which allows an authenticated user to modify post file attachments, props, and pin status after the edit window has expired via the post patch and update API endpoints...

CVE-2026-4053 post edit time limit is not enforced on some post update operations

Mattermost versions 11.5.x = 11.5.1, 10.11.x = 10.11.13 fail to enforce the PostEditTimeLimit on non-message post fields which allows an authenticated user to modify post file attachments, props, and pin status after the edit window has expired via the post patch and update API endpoints...

CVE-2026-4053

Mattermost versions 11.5.x = 11.5.1, 10.11.x = 10.11.13 fail to enforce the PostEditTimeLimit on non-message post fields which allows an authenticated user to modify post file attachments, props, and pin status after the edit window has expired via the post patch and update API endpoints...

CVE-2025-20072

Mattermost Mobile versions = 2.22.0 fail to properly validate the style of proto supplied to an action's style in post.props.attachments, which allows an attacker to crash the mobile via crafted malicious input...

CVE-2025-20088

Mattermost versions 10.2.x = 10.2.0, 9.11.x = 9.11.5, 10.0.x = 10.0.3, 10.1.x = 10.1.3 fail to properly validate post props which allows a malicious authenticated user to cause a crash via a malicious post...

CVE-2025-20036

Mattermost Mobile Apps versions =2.22.0 fail to properly validate post props which allows a malicious authenticated user to cause a crash via a malicious post...

CVE-2025-20088 Insufficient Input Validation on Post Props

Mattermost versions 10.2.x = 10.2.0, 9.11.x = 9.11.5, 10.0.x = 10.0.3, 10.1.x = 10.1.3 fail to properly validate post props which allows a malicious authenticated user to cause a crash via a malicious post...

CVE-2025-20086 Insufficient Input Validation on Post Props

Mattermost versions 10.2.x = 10.2.0, 9.11.x = 9.11.5, 10.0.x = 10.0.3, 10.1.x = 10.1.3 fail to properly validate post props which allows a malicious authenticated user to cause a crash via a malicious post...

CVE-2025-21083 Insufficient Input Validation on Post Props

Mattermost Mobile Apps versions =2.22.0 fail to properly validate post props which allows a malicious authenticated user to cause a crash via a malicious post...

CVE-2025-20036 Insufficient Input Validation on Post Props

Mattermost Mobile Apps versions =2.22.0 fail to properly validate post props which allows a malicious authenticated user to cause a crash via a malicious post...

CVE-2025-20036 Insufficient Input Validation on Post Props

Mattermost Mobile Apps versions =2.22.0 fail to properly validate post props which allows a malicious authenticated user to cause a crash via a malicious post...