CVE-2021-37703

Name: CVE-2021-37703
Creator: NVD / NIST
Published: 2021-08-13T16:15:07.827+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.3/10EPSS 0.84%

Last modified Jun 17, 2026

CVE-2021-37703 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. Discourse is an open-source platform for community discussion. In Discourse before versions 2.7.8 and 2.8.0.beta5, a user's read state for a topic such as the last read post number and the notification level is exposed.. EPSS estimates a 0.84% chance of exploitation in the next 30 days.

Description

Discourse is an open-source platform for community discussion. In Discourse before versions 2.7.8 and 2.8.0.beta5, a user's read state for a topic such as the last read post number and the notification level is exposed.

Metrics

CVSS 3.1

4.3/10

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

EPSS Probability

0.84%

53.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-200

Affected Software

Vendor	Product	Versions	Update
Discourse	Discourse	< 2.7.8	—
Discourse	Discourse	2.8.0	Beta1

References

https://github.com/discourse/discourse/commit/aed65ec16d38886d7be7209d8c02df4ffd4937a4Patch, Third Party Advisory
https://github.com/discourse/discourse/security/advisories/GHSA-gq2h-qhg2-phf9Third Party Advisory
https://github.com/discourse/discourse/commit/aed65ec16d38886d7be7209d8c02df4ffd4937a4Patch, Third Party Advisory
https://github.com/discourse/discourse/security/advisories/GHSA-gq2h-qhg2-phf9Third Party Advisory

Timeline

Published: Aug 13, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-37703?

How severe is CVE-2021-37703?

CVE-2021-37703 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 0.84% probability of exploitation in the next 30 days.

How do I fix CVE-2021-37703?

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-2021-37703?

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

Scan your code now

Source: NVD / NIST