XSS in Mozilla Bleach
CVE-2020-6816
In Mozilla Bleach before 3.12, a mutation XSS in bleach.clean when RCDATA and either svg or math tags are whitelisted and the keyword argument strip=False.
Vulnerability class: XSS (Cross-Site Scripting)
EPSS: 0.013 (67.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
Affected products
- Mozilla Bleach
- Fedoraproject Fedora — versions 33
- N/a Mozilla Bleach — versions <=3.11
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security@mozilla.org (Third Party Advisory, x_refsource_MISC)
- security@mozilla.org (Exploit, Third Party Advisory, x_refsource_MISC)
- security@mozilla.org (x_refsource_FEDORA, vendor-advisory)
- security@mozilla.org (Exploit, Third Party Advisory, x_refsource_MISC)
Frequently asked questions
- What is CVE-2020-6816?
- CVE-2020-6816 is a medium-severity vulnerability in Mozilla Bleach, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-03-24.
- How severe is CVE-2020-6816?
- Medium severity. CVSS v3 base score is 6.1 out of 10.
- Is CVE-2020-6816 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.