What is CVE-2021-43793?

CVE-2021-43793 is a medium-severity vulnerability in Discourse, classified under Improper Privilege Management. CVSS score: 4.3/10. Published 2021-12-01.

How severe is CVE-2021-43793?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Privilege escalation in Discourse

CVE-2021-43793

Discourse is an open source discussion platform. In affected versions a vulnerability in the Polls feature allowed users to vote multiple times in a single-option poll. The problem is patched in the latest tests-passed, beta and stable versions of Discourse

Vulnerability class: Privilege Escalation

Published 2021-12-01 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.008 (54.5th percentile), scored 2026-10-07.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 54.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: +0.000

Affected products

Discourse — versions stable < 2.7.11, tests-passed < 2.8.0.beta9, 2.8.0

Weakness classification (CWE)

CWE-269 — Improper Privilege Management

References

github.com/discourse/discourse/security/advisories/GHSA-jq7h-44vc-h6qx (Third Party Advisory)
github.com/discourse/discourse/commit/0c6b9df77bac9c6f7c7e2eadf6fe100064afdeab (Patch, Third Party Advisory)
github.com/discourse/discourse/commit/1d0faedfbc3a8b77b971dc70d25e30791dbb6e0b (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-43793?: CVE-2021-43793 is a medium-severity vulnerability in Discourse, classified under Improper Privilege Management. CVSS score: 4.3/10. Published 2021-12-01.
How severe is CVE-2021-43793?: Medium severity. CVSS v3 base score is 4.3 out of 10.