Open WebUI: Channel members can overwrite another member's message via the chat completions endpoint

Summary Any member of a channel who can post to it could also replace the text of a message written by a different member. The channel branch of the chat completions endpoint checked that the caller may write to the channel, and that the targeted message belongs to that channel, but never checked...

GHSA-MJ5R-JF49-M3W7 Open WebUI: Any member with write access to a standard channel can edit or delete other members' messages

Summary On standard channels, the message update and delete handlers accepted any caller holding write access on the channel, without checking that the caller wrote the message. Write access is the same grant a member needs in order to post, so every ordinary participant in a shared channel could...

Open WebUI: Any member with write access to a standard channel can edit or delete other members' messages

Summary On standard channels, the message update and delete handlers accepted any caller holding write access on the channel, without checking that the caller wrote the message. Write access is the same grant a member needs in order to post, so every ordinary participant in a shared channel could...

CVE-2026-40592

FreeScout (self-hosted help desk) prior to 1.8.214 is affected by CVE-2026-40592. The vulnerability lies in the undo-send route GET /conversation/undo-reply/{thread_id}, which only checks whether the current user can view the parent conversation and does not verify that the user created the reply...

Mastodon < 4.1.18 Multiples Vulnerabilities

According to its self-reported version number, the Mastodon application running on the remote host is prior to 4.1.18 or 4.2.x prior to 4.2.10. It is, therefore, affected by multiples vulnerabilities : - An Insufficient permission checking on multiple API endpoints - An Improper authorship check ...

Mastodon 4.2.x < 4.2.10 Multiples Vulnerabilities

According to its self-reported version number, the Mastodon application running on the remote host is prior to 4.1.18 or 4.2.x prior to 4.2.10. It is, therefore, affected by multiples vulnerabilities : - An Insufficient permission checking on multiple API endpoints - An Improper authorship check ...

CVE-2024-37903 Mastodon has improper authorship check on audience extension for existing posts

Mastodon is a self-hosted, federated microblogging platform. Starting in version 2.6.0 and prior to versions 4.1.18 and 4.2.10, by crafting specific activities, an attacker can extend the audience of a post they do not own to other Mastodon users on a target server, thus gaining access to the...