Medium severity · published Feb 16, 2023
CVE-2021-23980
A mutation XSS affects users calling bleach.clean with all of: svg or math in the allowed tags p or br in allowed tags style, title, noscript, script, textarea, noframes, iframe,…
6.1
CVSS
0.5%
EPSS
No
On KEV
Description
A mutation XSS affects users calling bleach.clean with all of: svg or math in the allowed tags p or br in allowed tags style, title, noscript, script, textarea, noframes, iframe, or xmp in allowed tags the keyword argument strip_comments=False Note: none of the above tags are in the default allowed tags and strip_comments defaults to True.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 41% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
BL
Bleach · Mozilla
before 3.3.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-23980
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-23980
Exploit
https://bugzilla.mozilla.org/show_bug.cgi?id=CVE-2021-23980
Vendor Advisory
https://github.com/mozilla/bleach/security/advisories/GHSA-vv2x-vrpj-qqpq
More from Bleach
9.8
CVE-2018-7753
An issue was discovered in Bleach 2.1.x before 2.1.3
7.5
CVE-2020-6817
bleach.clean behavior parsing style attributes could result in a regular expression denial of service (ReDoS)
6.1
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
6.1
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