CVE-2026-10103

Mattermost versions 11.7.x = 11.7.2, 11.6.x = 11.6.4, 10.11.x = 10.11.19 fail to verify post ownership in the shared channel inbound sync handler, which allows an authenticated remote cluster to modify or delete posts authored by local users or other remotes via crafted sync messages referencing...

CVE-2025-24903

libsignal-service-rs is a Rust version of the libsignal-service-java library which implements the core functionality to communicate with Signal servers. Prior to commit 82d70f6720e762898f34ae76b0894b0297d9b2f8, any contact may forge a sync message, impersonating another device of the local user...

CVE-2025-24903 libsignal-service-rs Doesn't Check Origin of Sync Messages

libsignal-service-rs is a Rust version of the libsignal-service-java library which implements the core functionality to communicate with Signal servers. Prior to commit 82d70f6720e762898f34ae76b0894b0297d9b2f8, any contact may forge a sync message, impersonating another device of the local user...

CVE-2025-24903 libsignal-service-rs Doesn't Check Origin of Sync Messages

libsignal-service-rs is a Rust version of the libsignal-service-java library which implements the core functionality to communicate with Signal servers. Prior to commit 82d70f6720e762898f34ae76b0894b0297d9b2f8, any contact may forge a sync message, impersonating another device of the local user...

BIT-MATTERMOST-2024-41926

Mattermost versions 9.9.x = 9.9.0 and 9.5.x = 9.5.6 fail to validate the source of sync messages and only allow the correct remote IDs, which allows a malicious remote to set arbitrary RemoteId values for synced users and therefore claim that a user was synced from another remote...

Improper Access Control

github.com/mattermost/mattermost-server is vulnerable to Improper Access Control. The vulnerability is caused due to a failure to validate the source of sync messages and only allow the correct remote IDs. This allows a malicious remote user to set arbitrary RemoteId values for synced users and...

GHSA-9FPW-C9X7-CV3J Mattermost allows remote actor to set arbitrary RemoteId values for synced users

Mattermost versions 9.9.x = 9.9.0 and 9.5.x = 9.5.6 fail to validate the source of sync messages and only allow the correct remote IDs, which allows a malicious remote to set arbitrary RemoteId values for synced users and therefore claim that a user was synced from another remote...

CVE-2024-41926

Mattermost versions 9.9.x = 9.9.0 and 9.5.x = 9.5.6 fail to validate the source of sync messages and only allow the correct remote IDs, which allows a malicious remote to set arbitrary RemoteId values for synced users and therefore claim that a user was synced from another remote...

CVE-2024-41926 Malicious remote can claim that a user was synced from another remote

Mattermost versions 9.9.x = 9.9.0 and 9.5.x = 9.5.6 fail to validate the source of sync messages and only allow the correct remote IDs, which allows a malicious remote to set arbitrary RemoteId values for synced users and therefore claim that a user was synced from another remote...

CVE-2024-41926

Mattermost versions 9.9.x = 9.9.0 and 9.5.x = 9.5.6 fail to validate the source of sync messages and only allow the correct remote IDs, which allows a malicious remote to set arbitrary RemoteId values for synced users and therefore claim that a user was synced from another remote...

PT-2024-28415 · Mattermost · Mattermost

Name of the Vulnerable Software and Affected Versions: Mattermost versions 9.5.x through 9.5.6 Mattermost versions 9.7.x through 9.7.5 Mattermost versions 9.8.x through 9.8.1 Mattermost versions 9.9.x through 9.9.0 Description: The issue arises from the failure to properly validate that the chann...

CVE-2024-41926: Improper Access Control

Mattermost versions 9.9.x = 9.9.0 and 9.5.x = 9.5.6 fail to validate the source of sync messages and only allow the correct remote IDs, which allows a malicious remote to set arbitrary RemoteId values for synced users and therefore claim that a user was synced from another remote...