CVE-2021-41095
4.2 MEDIUMDiscourse is an open source discussion platform
Published: 2021-09-27 · Last updated: 2026-06-17
Severity and scoring
- CVSS
- 4.2 MEDIUM
- Vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
- CWE
- CWE-79
Affected products
| Vendor | Product |
|---|---|
| discourse | discourse |
Description
Discourse is an open source discussion platform. There is a cross-site scripting (XSS) vulnerability in versions 2.7.7 and earlier of the `stable` branch, versions 2.8.0.beta6 and earlier of the `beta` branch, and versions 2.8.0.beta6 and earlier of the `tests-passed` branch. Rendering of some error messages that contain user input can be susceptible to XSS attacks. This vulnerability only affects sites which have blocked watched words that contain HTML tags, modified or disabled Discourse's default Content Security Policy. This issue is patched in the latest `stable`, `beta` and `tests-passed` versions of Discourse. As a workaround, avoid modifying or disabling Discourse’s default Content Security Policy, and blocking watched words containing HTML tags.
Source: NVD
References
- [NVD]https://nvd.nist.gov/vuln/detail/CVE-2021-41095
- [Patch]https://github.com/discourse/discourse/pull/14434/commits/40b776b9d39c41d9273d01eecf8fe03aa39fcb59
- [Other]https://github.com/discourse/discourse/security/advisories/GHSA-qvqx-2h7w-m479
- [Patch]https://github.com/discourse/discourse/pull/14434/commits/40b776b9d39c41d9273d01eecf8fe03aa39fcb59
- [Other]https://github.com/discourse/discourse/security/advisories/GHSA-qvqx-2h7w-m479
Related CVEs
Same vendor
- CVE-2026-34154 — Discourse is an open-source discussion platform (5.3 MEDIUM)
- CVE-2026-33514 — Discourse is an open-source discussion platform (4.3 MEDIUM)
- CVE-2026-32244 — Discourse is an open-source discussion platform (5.3 MEDIUM)
- CVE-2021-41163 — Discourse is an open source platform for community discussion (10.0 CRITICAL)
- CVE-2021-41140 — Discourse-reactions is a plugin for the Discourse platform that allows user to add their reactions to the post (5.3 MEDIUM)
Same CWE
- CVE-2026-12425 — Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in PowerSchool Employee Access ...
- CVE-2024-30476 — PowerStore contains a Stored Cross-Site Scripting Vulnerability in the PowerStore Manager (5.4 MEDIUM)
- CVE-2026-54198 — Unauthenticated Cross Site Scripting (XSS) in Media LIbrary Assistant <= 3.35 versions (7.1 HIGH)
- CVE-2026-54191 — Unauthenticated Cross Site Scripting (XSS) in Pods <= 3.3.8 versions (7.1 HIGH)
- CVE-2026-39437 — Unauthenticated Cross Site Scripting (XSS) in Min Max Step Quantity Limits Manager for WooCommerce <= 5.2.2 versions (7.1 HIGH)