CVE-2023-5331

Name: CVE-2023-5331
Creator: NVD / NIST
Published: 2023-10-09T11:15:11.28+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 0.32%

Last modified Jun 17, 2026

CVE-2023-5331 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. Mattermost fails to properly check the creator of an attached file when adding the file to a draft post, potentially exposing unauthorized file information. . EPSS estimates a 0.32% chance of exploitation in the next 30 days.

Description

Mattermost fails to properly check the creator of an attached file when adding the file to a draft post, potentially exposing unauthorized file information.

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

0.32%

23.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Mattermost	Mattermost Server	< 7.8.11
Mattermost	Mattermost Server	>= 8.0.0, < 8.0.3
Mattermost	Mattermost Server	>= 8.1.0, < 8.1.2

References

https://mattermost.com/security-updatesVendor Advisory
https://mattermost.com/security-updatesVendor Advisory

Timeline

Published: Oct 9, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-5331?

Mattermost fails to properly check the creator of an attached file when adding the file to a draft post, potentially exposing unauthorized file information.

How severe is CVE-2023-5331?

CVE-2023-5331 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 0.32% probability of exploitation in the next 30 days.

How do I fix CVE-2023-5331?

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-2023-5331?

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

Scan your code now

Source: NVD / NIST