XSS in Mozilla Bleach
CVE-2020-6802
In Mozilla Bleach before 3.11, a mutation XSS affects users calling bleach.clean with noscript and a raw tag in the allowed/whitelisted tags option.
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: 0.017 (76.8th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 76.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: +0.000
Affected products
- Mozilla Bleach
- Fedoraproject Fedora — versions 30, 31, 32
- Mozilla Bleach — versions <=3.10
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/mozilla/bleach/security/advisories/GHSA-q65m-pv3f-wr5r (Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- www.checkmarx.com/blog/vulnerabilities-discovered-in-mozilla-bleach (Exploit, Third Party Advisory)
- advisory.checkmarx.net/advisory/CX-2020-4276 (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-6802?
- CVE-2020-6802 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-2020-6802?
- Medium severity. CVSS v3 base score is 6.1 out of 10.
- Is CVE-2020-6802 known to be exploited?
- 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.