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CVE-2026-2461 PoC — Missing authorization check allows unauthorized modification of other users' comments on a board

Source
https://github.com/destiny-creates/CVE-2026-2461-poc
Associated Vulnerability
Title:Missing authorization check allows unauthorized modification of other users' comments on a board (CVE-2026-2461)
Description:Mattermost Plugins versions <=11.3 11.0.3 11.2.2 10.10.11.0 fail to implement authorisation checks on comment block modifications, which allows an authorised attacker with editor permission to modify comments created by other board members. Mattermost Advisory ID: MMSA-2025-00559
Description
POC in python for CVE-2026-2461
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