XSS in Discourse
CVE-2021-37633
Discourse is an open source discussion platform. In versions prior to 2.7.8 rendering of d-popover tooltips can be susceptible to XSS attacks. This vulnerability only affects sites which have modified or disabled Discourse's default Content Security Policy. This issue is patched in the latest `stable` 2.7.8 version of Discourse. As a workaround users may ensure that the Content Security Policy is enabled, and has not been modified in a way which would make it more vulnerable to XSS attacks.
Vulnerability class: XSS (Cross-Site Scripting)
EPSS: 0.008 (51.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N.
Affected products
- Discourse — versions 2.8.0, < 2.7.8
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Third Party Advisory)
- security-advisories@github.com (Patch, Third Party Advisory, x_refsource_MISC)
Frequently asked questions
- What is CVE-2021-37633?
- CVE-2021-37633 is a high-severity vulnerability in Discourse, classified under Cross-site Scripting. CVSS score: 7.4/10. Published 2021-08-09.
- How severe is CVE-2021-37633?
- High severity. CVSS v3 base score is 7.4 out of 10.