CVE Vulnerability

CVE-2021-43827

discourse-footnote is a library providing footnotes for posts in Discourse. ### Impact When posting an inline footnote wrapped in `` tags (e.g. `^[footnote]`, the resulting rendered HTML would include a nested ``, which is stripped by Nokogiri because it is not valid. This then caused a javascript error on topic pages because we were looking for an `` element inside the footnote reference span and getting its ID, and because it did not exist we got a null reference error in javascript. Users are advised to update to version 0.2. As a workaround editing offending posts from the rails console or the database console for self-hosters, or disabling the plugin in the admin panel can mitigate this issue.

4 /10

CVSS v2.0 :

V3 Legend

Vector :

Exploitability : 8 / Impact : 2.9

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact PARTIAL

Scope

4.3 /10

CVSS v3.0 : MEDIUM

V3 Legend

Vector :

Exploitability : 2.8 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact LOW

Scope UNCHANGED

References
Link Resource
https://github.com/discourse/discourse-footnote/commit/796617e0131277011207541313522cd1946661ab Patch Third Party Advisory
https://github.com/discourse/discourse-footnote/security/advisories/GHSA-58vr-c56v-qr57 Third Party Advisory
Configurations

Configuration 1

cpe:2.3:a:discourse:discourse_footnote:*:*:*:*:*:discourse:*:*
Information

Published : 2021-12-14 11:15

Updated : 2021-12-29 08:31

NVD link : CVE-2021-43827

Mitre link : CVE-2021-43827

Products Affected
No products.
CWE
CWE-755