Signal is active with 2 mentions in latest observed window
Recommended action window: Monitor and triage in normal cycle
NVD description
Mattermost versions 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 fail to sanitize sensitive data in WebSocket messages which allows authenticated users to exfiltrate password hashes and MFA secrets via profile nickname updates or email verification events. Mattermost Advisory ID: MMSA-2025-00560
Priority
LOW
Exploitation
NONE
PoC
NONE
Patch
NONE
Momentum
NONE
If you run products in this scope, you should treat this CVE as relevant to your environment.
CVE-2025-13821 Mattermost WebSocket Message Vulnerability Enables Sensitive Data Exfiltration https://vulmon.com/vulnerabilitydetails?qid=CVE-2025-13821
Post summary
The post announces a Mattermost WebSocket message vulnerability that could enable sensitive data exfiltration, but provides no proof‑of‑concept, exploit code, active exploitation evidence, patch information, or detailed technical description.
CVE-2025-13821 Mattermost versions 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 fail to sanitize sensitive data in WebSocket messages which allows authenticated users to e… https://www.cve.org/CVERecord?id=CVE-2025-13821
Post summary
The CVE-2025-13821 affects specific Mattermost releases, enabling authenticated users to read sensitive data via unsanitized WebSocket messages. No exploitation evidence or patch information is provided.
1 of 1 entries
| Part | Vendor | Product | Version | Target SW | Target HW |
|---|---|---|---|---|---|
| App | mattermost | mattermost_server | - | - | - |