Vulnerability Monitor

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CVE-2021-43792

Discourse is an open source discussion platform. In affected versions a vulnerability affects users of tag groups who use the "Tags are visible only to the following groups" feature. A tag group may only allow a certain group (e.g. staff) to view certain tags. Users who were tracking or watching the tags via /preferences/tags, then have their staff status revoked will still see notifications related to the tag, but will not see the tag on each topic. This issue has been patched in stable version 2.7.11. Users are advised to upgrade as soon as possible.

Security Impact Summary

This vulnerability carries a MEDIUM severity rating with a CVSS v3.1 score of 4.3, indicating it can be exploited remotely over the network with relatively low complexity without requiring user interaction requiring only low-level privileges . The vulnerability impacts limited data confidentiality, for affected systems. Impacting 1 product from discourse organizations running these solutions should prioritize assessment and patching.

Historical Context

Reported in 2021, this vulnerability emerged during an era marked by increased sophistication in supply chain attacks, cloud infrastructure vulnerabilities, and software-as-a-service (SaaS) security challenges. Security practices during this period emphasized zero-trust architectures, container security, and API protection.

Published

2021-12-01T20:15:08.433

Last Modified

2024-11-21T06:29:47.963

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 4.3 (MEDIUM)

CVSSv2 Vector

AV:N/AC:M/Au:S/C:P/I:N/A:N

Access Vector: NETWORK
Access Complexity: MEDIUM
Authentication: SINGLE
Confidentiality Impact: PARTIAL
Integrity Impact: NONE
Availability Impact: NONE

Exploitability Score

6.8

Impact Score

2.9

Weaknesses

Type: Secondary
CWE-200
Type: Primary
NVD-CWE-Other

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	discourse	discourse	< 2.7.11	Yes
Application	discourse	discourse	2.8.0	Yes
Application	discourse	discourse	2.8.0	Yes
Application	discourse	discourse	2.8.0	Yes
Application	discourse	discourse	2.8.0	Yes
Application	discourse	discourse	2.8.0	Yes
Application	discourse	discourse	2.8.0	Yes
Application	discourse	discourse	2.8.0	Yes

References

https://github.com/discourse/discourse/commit/cdaf7f4bb3ec268238e4c29a14bb73fad56574b4 Patch, Third Party Advisory ([email protected])
https://github.com/discourse/discourse/security/advisories/GHSA-pq2x-vq37-8522 Third Party Advisory ([email protected])
https://meta.discourse.org/t/non-forum-staff-getting-notifications-for-staff-only-tags/184895 Vendor Advisory ([email protected])
https://github.com/discourse/discourse/commit/cdaf7f4bb3ec268238e4c29a14bb73fad56574b4 Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/discourse/discourse/security/advisories/GHSA-pq2x-vq37-8522 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://meta.discourse.org/t/non-forum-staff-getting-notifications-for-staff-only-tags/184895 Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For discourse's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.