CVE-2023-26040

Name: CVE-2023-26040
Creator: NVD / NIST
Published: 2023-03-17T15:15:12.237+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 0.35%

Last modified Jun 17, 2026

CVE-2023-26040 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. Discourse is an open-source discussion platform. Between versions 3.1.0.beta2 and 3.1.0.beta3 of the `tests-passed` branch, editing or responding to a chat message containing malicious content could lead to a cross-site scripting attack. EPSS estimates a 0.35% chance of exploitation in the next 30 days.

Description

Discourse is an open-source discussion platform. Between versions 3.1.0.beta2 and 3.1.0.beta3 of the `tests-passed` branch, editing or responding to a chat message containing malicious content could lead to a cross-site scripting attack. This issue is patched in version 3.1.0.beta3 of the `tests-passed` branch. There are no known workarounds.

Metrics

CVSS 3.1

6.1/10

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

EPSS Probability

0.35%

26.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions	Update
Discourse	Discourse	3.1.0	Beta2

References

Timeline

Published: Mar 17, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-26040?

How severe is CVE-2023-26040?

CVE-2023-26040 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 0.35% probability of exploitation in the next 30 days.

How do I fix CVE-2023-26040?

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-2023-26040?

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

Scan your code now

Source: NVD / NIST