CVE-2026-2325 — Denial of Service
CVE-2026-2325 — Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 fail to limit the size of the request body on the start meeting API endpoint, which allows an authenticated attacker to cause resource exhaustion or denial of service via a crafted oversized HTTP POST request
What This Means For You
- If your environment is affected by CWE-770, review your exposure and prioritize patching based on your environment. Monitor vendor advisories for CVE-2026-2325 updates and patches.
Related ATT&CK Techniques
🛡️ Detection Rules
2 rules · 6 SIEM formats2 detection rules auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
Mattermost Start Meeting API Oversized Request - CVE-2026-2325
title: Mattermost Start Meeting API Oversized Request - CVE-2026-2325
id: scw-2026-05-18-ai-1
status: experimental
level: medium
description: |
Detects an HTTP POST request to the Mattermost '/api/v1/meetings' endpoint, which is targeted by CVE-2026-2325. This vulnerability allows an authenticated attacker to cause resource exhaustion by sending an oversized request body, leading to a denial of service. This rule specifically targets the vulnerable API endpoint.
author: SCW Feed Engine (AI-generated)
date: 2026-05-18
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-2325/
tags:
- attack.denial_of_service
- attack.t1498
logsource:
category: webserver
detection:
selection:
cs-uri|endswith:
- '/api/v1/meetings'
cs-method:
- 'POST'
condition: selection
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-2325 | vulnerability | CVE-2026-2325 |
| CWE-770 | weakness | CWE-770 |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | May 18, 2026 at 11:16 UTC |
This content was curated and summarized by Shimi's Cyber World for informational purposes. It is not copied or republished in full. All intellectual property rights remain with the original author and source.
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