What’s Vulnerable › Vulnerabilities
CVE-2020-6802
- Severity: medium (CVSS 6.1 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 1.7% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2020-03-24 · updated 2026-06-17
- Weakness: CWE-79
Description
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.
Affected products
- Fedoraproject Fedora: 30, 31, 32
- Mozilla Bleach: before 3.1.1 — fixed in 3.1.1
How to fix
Upgrade to a fixed version: Mozilla Bleach 3.1.1. Check the vendor advisory for mitigations.
References
- https://advisory.checkmarx.net/advisory/CX-2020-4276
- https://github.com/mozilla/bleach/security/advisories/GHSA-q65m-pv3f-wr5r
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/72R4VFFHDRSQMNT7IZU3X2755ZP4HGNI/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OCNLM2MGQTOLCIVVYS2Z5S7KOQJR5JC4/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YTULPQB7HVPPYWEYVNHJGDTSPVIDHIZX/
- https://www.checkmarx.com/blog/vulnerabilities-discovered-in-mozilla-bleach
- https://advisory.checkmarx.net/advisory/CX-2020-4276
- https://github.com/mozilla/bleach/security/advisories/GHSA-q65m-pv3f-wr5r
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/72R4VFFHDRSQMNT7IZU3X2755ZP4HGNI/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OCNLM2MGQTOLCIVVYS2Z5S7KOQJR5JC4/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YTULPQB7HVPPYWEYVNHJGDTSPVIDHIZX/
- https://www.checkmarx.com/blog/vulnerabilities-discovered-in-mozilla-bleach
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