What’s Vulnerable › Vulnerabilities

CVE-2023-1776: Stored XSS via SVG attachment on Boards

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-03-31 · updated 2026-06-17
• Weakness: CWE-79

Description

Boards in Mattermost allows an attacker to upload a malicious SVG image file as an attachment to a card and share it using a direct link to the file.

Affected products

• Mattermost: before 7.1.6; 7.7.1 — fixed in 7.1.6

How to fix

Upgrade to a fixed version: Mattermost 7.1.6. Check the vendor advisory for mitigations.

References

• https://mattermost.com/security-updates/
• https://mattermost.com/security-updates/

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