Attachment Handling Flaw in Mattermost Web Application
CVE-2025-20621

6.5MEDIUM

Key Information:

Vendor

Mattermost
Status
Mattermost
Vendor
CVE Published:
16 January 2025

What is CVE-2025-20621?

Certain versions of Mattermost are susceptible to a vulnerability that arises from improper handling of posts with attachments. Specifically, the issue occurs when fields within these attachments cannot be cast to a String type. An attacker can exploit this flaw by sending specially crafted posts to a channel, which may result in the web application crashing and denying service to legitimate users. Organizations utilizing affected versions of Mattermost should review security patches to mitigate this risk.

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Affected Version(s)

Mattermost 10.2.0

Mattermost 9.11.0 <= 9.11.5

Mattermost 10.0.0 <= 10.0.3

References

https://mattermost.com/security-updates

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

c0rydoras (c0rydoras)
JSON
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