CVE-2023-2808

Lack of URL normalization allows rendering previews for disallowed domains

State: Published
Severity: 4.3 Medium
Published: May 29, 2023
Updated: Dec 6, 2024
Reserved: May 19, 2023

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.

Scores

CVSS	Score	Vector	Source
3.1	4.3 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N	Mattermost

Weaknesses

CWE-20 Improper Input Validation

Affected Products

Product	Versions
MattermostMattermost	before 7.1.9Affected before 7.8.4Affected before 7.9.3Affected 7.1.9Not affected 7.8.4Not affected 7.9.3Not affected 7.10Not affected

References

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

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