CVE-2021-37693

Name: CVE-2021-37693
Creator: NVD / NIST
Published: 2021-08-13T16:15:07.717+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.83%

Last modified Jun 17, 2026

CVE-2021-37693 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Discourse is an open-source platform for community discussion. In Discourse before versions 2.7.8 and 2.8.0.beta4, when adding additional email addresses to an existing account on a Discourse site an email token is generated as part of the email verification process. EPSS estimates a 0.83% 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.beta4, when adding additional email addresses to an existing account on a Discourse site an email token is generated as part of the email verification process. Deleting the additional email address does not invalidate an unused token which can then be used in other contexts, including reseting a password.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

0.83%

53.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

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

References

https://github.com/discourse/discourse/commit/fb14e50741a4880cda22244eded8858e2f5336efPatch, Third Party Advisory
https://github.com/discourse/discourse/security/advisories/GHSA-9377-96f4-cww4Third Party Advisory
https://github.com/discourse/discourse/commit/fb14e50741a4880cda22244eded8858e2f5336efPatch, Third Party Advisory
https://github.com/discourse/discourse/security/advisories/GHSA-9377-96f4-cww4Third Party Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2021-37693?

How severe is CVE-2021-37693?

CVE-2021-37693 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.83% probability of exploitation in the next 30 days.

How do I fix CVE-2021-37693?

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-2021-37693?

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

Scan your code now

Source: NVD / NIST