CVE-2023-2808

Lack of URL normalization allows rendering previews for disallowed domains

Published May 29, 2023 CVSS 3.1 · 4.3 Medium EPSS < 1% KEV · Not listed
Description
Mattermost fails to normalize UTF confusable characters when determining if a preview should be generated for a hyperlink, allowing an attacker to trigger link preview on a disallowed domain using a specially crafted link.

Remediation

Vendor Solution

Update Mattermost to version v7.1.9, v7.8.4, v7.9.3, v7.10, or higher.

Tracking

Sign in to view the affected projects.

Advisories

Source ID Title
EUVD EUVD EUVD-2023-34261 Mattermost fails to normalize UTF confusable characters when determining if a preview should be generated for a hyperlink, allowing an attacker to trigger link preview on a disallowed domain using a specially crafted link.
References
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Mattermost
Published
Updated
Dec 6, 2024, 11:04 PM
Reserved
May 19, 2023, 9:34 AM
Status
Modified
Published
May 29, 2023, 10:15 AM
Modified
Jun 17, 2026, 5:53 AM