CVE-2021-43827

FAUCET Score

CVE-2021-43827 affects the discourse-footnote plugin for Discourse, where an inline footnote wrapped in an anchor tag leads to invalid HTML and a JavaScript null reference error on topic pages. This vulnerability has a CVSS score of 4.3 (MEDIUM), indicating a low availability impact (A:L) due to a denial of service from the JavaScript error, with low attack complexity and privileges required. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

Vendor	Product	Version(s)	CPE
		< 0.2CPE matchmatch criteria	cpe:2.3:a:discourse:discourse_footnote::::::discourse::*

CVSS Data

CVSS version used by this source: 3.1

4.3MEDIUM

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

LOW

Exploitability Score

2.8

Impact Score

1.4

CvssVersion

3.1

Exploit Intelligence

EPSS Score

0.80%

Probability of exploitation in next 30 days

EPSS Percentile

52.9%

Percentile rank of EPSS score among Peer Group

As of 2026-07-27

Model: v2026.06.15

This CVE's current EPSS score of 0.0080 is in the 64th percentile among its peer group of 21,974 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference

View patch

References

github.com / discourse/discourse-footnote/commit/796617e0131277011207541313522cd1946661ab

PatchThird Party Advisory

github.com / discourse/discourse-footnote/security/advisories/GHSA-58vr-c56v-qr57

Third Party Advisory