CVE-2020-6816

CWE-79 — Cross-site Scripting (XSS)10 documents7 sources
Severity
6.1MEDIUM
EPSS
0.4%
top 38.11%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Mozilla BleachFedoraproject Fedora
Timeline
PublishedMar 24
Latest updateMar 5

Description

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.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:NExploitability: 2.8 | Impact: 2.7

Affected Packages4 packages

▶NVDmozilla/bleach< 3.1.2
▶CVEListV5mozilla_bleach<=3.11
▶PyPIbleach< 3.1.2
▶Debianpython-bleach< 3.1.3-1+3

Also affects: Fedora 33

🔴Vulnerability Details

4
OSV
CVE-2020-6816: In Mozilla Bleach before 3↗2020-03-24
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CVEList
CVE-2020-6816: In Mozilla Bleach before 3↗2020-03-24
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GHSA
Bleach vulnerable to mutation XSS via whitelisted math or svg and raw tag↗2020-03-24
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OSV
Bleach vulnerable to mutation XSS via whitelisted math or svg and raw tag↗2020-03-24
▶

📋Vendor Advisories

2
Ubuntu
Bleach vulnerabilities↗2026-03-05
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Debian
CVE-2020-6816: python-bleach - In Mozilla Bleach before 3.12, a mutation XSS in bleach.clean when RCDATA and ei...↗2020
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💬Community

3
Bugzilla
CVE-2020-6816 python-bleach: Mutation cross-site scripting in bleach.clean↗2020-04-24
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Bugzilla
CVE-2020-6816 python-bleach: Mutation cross-site scripting in bleach.clean [fedora-all]↗2020-04-24
▶
Bugzilla
CVE-2020-6816 python-bleach: Mutation cross-site scripting in bleach.clean [epel-all]↗2020-04-24
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CVE-2020-6816 (MEDIUM CVSS 6.1) | In Mozilla Bleach before 3.12 | cvebase.io