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)
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.013 (70.2th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 70th percentile — 70.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: +0.000
Affected products
- Mozilla Bleach
- Fedoraproject Fedora — versions 33
- Mozilla Bleach — versions <=3.11
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/mozilla/bleach/security/advisories/GHSA-m6xf-fq7q-8743 (Third Party Advisory)
- www.checkmarx.com/blog/vulnerabilities-discovered-in-mozilla-bleach (Exploit, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- advisory.checkmarx.net/advisory/CX-2020-4277 (Exploit, Third Party Advisory)
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.