Cross-site Scripting (XSS)

Overview Affected versions of this package are vulnerable to Cross-site Scripting XSS via the ActivityPub client when processing posts shared by a maliciously customized ActivityPub server. An attacker can execute arbitrary JavaScript code in the context of the user by injecting malicious content...

Improper Verification

github.com/mattermost/mattermost-server is vulnerable to improper verification. The vulnerability is due to failure to validate that /share-issue-publicly post actions were created by the Jira plugin, which allows an attacker to exfiltrate Jira tickets by tricking victim users into interacting wi...

CVE-2026-1009

A stored cross-site scripting XSS vulnerability exists in the Altium Forum due to missing server-side input sanitization in forum post content. An authenticated attacker can inject arbitrary JavaScript into forum posts, which is stored and executed when other users view the affected post...

CVE-2026-1009 Stored Cross-Site Scripting in Altium Live Forum Leading to Cross-Customer Data Exposure

A stored cross-site scripting XSS vulnerability exists in the Altium Forum due to missing server-side input sanitization in forum post content. An authenticated attacker can inject arbitrary JavaScript into forum posts, which is stored and executed when other users view the affected post...

GO-2026-4300 Mattermost Server is vulnerable to DoS through maliciously crafted posts in github.com/mattermost/mattermost-server

Mattermost Server is vulnerable to DoS through maliciously crafted posts in github.com/mattermost/mattermost-server...

Identification of Malicious Posts on the Dark Web Using Supervised Machine Learning

Given the constant growth and increasing sophistication of cyberattacks, cybersecurity can no longer rely solely on traditional defense techniques and tools. Proactive detection of cyber threats has become essential to help security teams identify potential risks and implement effective mitigatio...

Improper Input Validation

Mattermost is vulnerable to Improper Input Validation. The vulnerability is due to a failure to properly validate post props, which can result in a crash when malicious posts are processed...

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...

Exploiting Tragedy: Fake Donation Scams Amid Earthquake in Turkey & Syria

Exploiting Tragedy: Fake Donation Scams Amid Earthquake in Turkey & Syria By Daksh Kapur · February 23, 2023 Figure 1 image from freepik.com & flaticon.com The recent earthquake that shook Syria and Turkey left a devastating trail of destruction. The whole world has shown its support and...