Mozilla Bleach vulnerabilities

CVE-2020-6817 [HIGH] CWE-1333 CVE-2020-6817: bleach.clean behavior parsing style attributes could result in a regular expression denial of servic bleach.clean behavior parsing style attributes could result in a regular expression denial of service (ReDoS). Calls to bleach.clean with an allowed tag with an allowed style attribute are vulnerable to ReDoS. For example, bleach.clean(..., attributes={'a': ['style']}).

CVE-2021-23980 [MEDIUM] CWE-79 CVE-2021-23980: A mutation XSS affects users calling bleach.clean with all of: svg or math in the allowed tags p or 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.

CVE-2020-6802 [MEDIUM] CWE-79 CVE-2020-6802: In Mozilla Bleach before 3.11, a mutation XSS affects users calling bleach.clean with noscript and a 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.

CVE-2020-6816 [MEDIUM] CWE-79 CVE-2020-6816: In Mozilla Bleach before 3.12, a mutation XSS in bleach.clean when RCDATA and either svg or math tag 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.

CVE-2018-7753 [CRITICAL] CWE-20 CVE-2018-7753: An issue was discovered in Bleach 2.1.x before 2.1.3. Attributes that have URI values weren't proper An issue was discovered in Bleach 2.1.x before 2.1.3. Attributes that have URI values weren't properly sanitized if the values contained character entities. Using character entities, it was possible to construct a URI value with a scheme that was not allowed that would slide through unsanitized.