What’s Vulnerable › Vulnerabilities

CVE-2021-37863

• Severity: medium (CVSS 5.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-12-17 · updated 2026-06-17
• Weakness: CWE-20

Description

Mattermost 6.0 and earlier fails to sufficiently validate parameters during post creation, which allows authenticated attackers to cause a client-side crash of the web application via a maliciously crafted post.

Affected products

• Mattermost: through 6.0

References

• https://hackerone.com/reports/1253732
• https://mattermost.com/security-updates/
• https://hackerone.com/reports/1253732
• https://mattermost.com/security-updates/

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