UpHeron
All vulnerabilities

Servers and applications

CVE-2025-21088

Mattermost versions 10.2.x <= 10.2.0, 9.11.x <= 9.11.5, 10.0.x <= 10.0.3, 10.1.x <= 10.1.3 fail to properly validate the style of proto supplied to an action's style in post.props.attachments, which allows an attacker to crash the frontend via crafted malicious input.

Severity
Medium 6.5
Published
15 Jan 2025
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Fixed in
9.11.6, 10.0.4, 10.1.4
Sources
NVD

Affected software

SoftwareAffected versions
MattermostServers and applications · cpe:a:mattermost:mattermost_server
  • From 9.11.0 before 9.11.6
  • From 10.0.0 before 10.0.4
  • From 10.1.0 before 10.1.4
  • Version 10.2.0

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2025-21088
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2025-21088