CVE-2023-49809

Name: CVE-2023-49809
Creator: NVD / NIST
Published: 2023-12-12T09:15:09.11+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.64%

Last modified Jun 17, 2026

CVE-2023-49809 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. Mattermost fails to handle a null request body in the /add endpoint, allowing a simple member to send a request with null request body to that endpoint and make it crash. After a few repetitions, the plugin is disabled. . EPSS estimates a 0.64% chance of exploitation in the next 30 days.

Description

Mattermost fails to handle a null request body in the /add endpoint, allowing a simple member to send a request with null request body to that endpoint and make it crash. After a few repetitions, the plugin is disabled.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

0.64%

46.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Mattermost	Mattermost Server	<= 8.1.5
Mattermost	Mattermost Server	>= 9.0.0, <= 9.1.0

References

https://mattermost.com/security-updatesIssue Tracking, Vendor Advisory
https://mattermost.com/security-updatesIssue Tracking, Vendor Advisory

Timeline

Published: Dec 12, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-49809?

How severe is CVE-2023-49809?

CVE-2023-49809 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.64% probability of exploitation in the next 30 days.

How do I fix CVE-2023-49809?

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-2023-49809?

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

Scan your code now

Source: NVD / NIST