CVE-2020-6802
MEDIUM6.1EPSS 0.27%XSS in Bleach when noscript and raw tag whitelisted
Published: 2/24/2020Modified: 4/28/2026
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 packages (4)
- Debian/python-bleachfrom 0, < 3.1.1-1
- Debian/python-bleachfrom 0, < 3.1.1-0+deb10u1
- PyPI/bleachfrom 0, < 3.1.1
- PyPI/bleachfrom 0, < 3.1.1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N |
| osv | CVSS 3.1 | MEDIUM6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
References (16)
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2020-6802
- ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2020-6802
- PATCHhttps://github.com/mozilla/bleach
- WEBhttps://advisory.checkmarx.net/advisory/CX-2020-4276
- WEBhttps://bugzilla.mozilla.org/show_bug.cgi?id=1615315
- WEBhttps://cure53.de/fp170.pdf
- WEBhttps://github.com/mozilla/bleach/commit/f77e0f6392177a06e46a49abd61a4d9f035e57fd
- WEBhttps://github.com/mozilla/bleach/security/advisories/GHSA-q65m-pv3f-wr5r
- WEBhttps://github.com/pypa/advisory-database/tree/main/vulns/bleach/PYSEC-2020-27.yaml
- WEBhttps://lists.fedoraproject.org/archives/list/[email protected]/message/72R4VFFHDRSQMNT7IZU3X2755ZP4HGNI
- WEBhttps://lists.fedoraproject.org/archives/list/[email protected]/message/72R4VFFHDRSQMNT7IZU3X2755ZP4HGNI/
- WEBhttps://lists.fedoraproject.org/archives/list/[email protected]/message/OCNLM2MGQTOLCIVVYS2Z5S7KOQJR5JC4
- WEBhttps://lists.fedoraproject.org/archives/list/[email protected]/message/OCNLM2MGQTOLCIVVYS2Z5S7KOQJR5JC4/
- WEBhttps://lists.fedoraproject.org/archives/list/[email protected]/message/YTULPQB7HVPPYWEYVNHJGDTSPVIDHIZX
- WEBhttps://lists.fedoraproject.org/archives/list/[email protected]/message/YTULPQB7HVPPYWEYVNHJGDTSPVIDHIZX/
- WEBhttps://www.checkmarx.com/blog/vulnerabilities-discovered-in-mozilla-bleach