CVE-2023-2808

Name: CVE-2023-2808
Creator: NVD / NIST
Published: 2023-05-29T10:15:10.083+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 0.41%

Last modified Jun 17, 2026

CVE-2023-2808 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. 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. . EPSS estimates a 0.41% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.3/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS Probability

0.41%

32.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-20

Affected Software

Vendor	Product	Versions
Mattermost	Mattermost	>= 5.34.0, < 7.1.9
Mattermost	Mattermost	>= 7.2.0, < 7.8.4
Mattermost	Mattermost	>= 7.9.0, < 7.9.3

References

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

Timeline

Published: May 29, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-2808?

How severe is CVE-2023-2808?

CVE-2023-2808 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 0.41% probability of exploitation in the next 30 days.

How do I fix CVE-2023-2808?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-2808?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST