CVE-2020-6802 : In Mozilla Bleach before 3.11, a mutation XSS affects users calling bleach.clean

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.

Published 2020-03-24 22:15:13

Updated 2022-10-06 20:16:44

Source Mozilla Corporation

View at NVD, CVE.org

Vulnerability category: Cross site scripting (XSS)

Products affected by CVE-2020-6802

Mozilla » Bleach
Versions before (<) 3.1.1
cpe:2.3:a:mozilla:bleach:*:*:*:*:*:*:*:*
Matching versions
Fedoraproject » Fedora » Version: 31
cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*
Matching versions
Fedoraproject » Fedora » Version: 32
cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
Matching versions
Fedoraproject » Fedora » Version: 30
cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*
Matching versions

EPSS FAQ

0.43%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 75 %

Percentile, the proportion of vulnerabilities that are scored at or less

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
4.3	MEDIUM	AV:N/AC:M/Au:N/C:N/I:P/A:N	8.6	2.9	NIST
Access Vector: Network Access Complexity: Medium Authentication: None Confidentiality Impact: None Integrity Impact: Partial Availability Impact: None
6.1	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N	2.8	2.7	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: Required Scope: Changed Confidentiality: Low Integrity: Low Availability: None

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Assigned by: nvd@nist.gov (Primary)

https://github.com/mozilla/bleach/security/advisories/GHSA-q65m-pv3f-wr5r

mutation XSS in bleach.clean when noscript and raw tag whitelisted · Advisory · mozilla/bleach · GitHub
Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OCNLM2MGQTOLCIVVYS2Z5S7KOQJR5JC4/

[SECURITY] Fedora 30 Update: python-bleach-3.1.4-2.fc30 - package-announce - Fedora Mailing-Lists
Mailing List;Third Party Advisory
https://www.checkmarx.com/blog/vulnerabilities-discovered-in-mozilla-bleach

Mutation Cross-Site Scripting (mXSS) Vulnerabilities Discovered in Mozilla-Bleach
Exploit;Third Party Advisory

CVEs referencing this url
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/72R4VFFHDRSQMNT7IZU3X2755ZP4HGNI/

[SECURITY] Fedora 31 Update: python-bleach-3.1.4-2.fc31 - package-announce - Fedora Mailing-Lists
Mailing List;Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/YTULPQB7HVPPYWEYVNHJGDTSPVIDHIZX/

[SECURITY] Fedora 32 Update: python-bleach-3.1.4-2.fc32 - package-announce - Fedora Mailing-Lists
Mailing List;Third Party Advisory
https://advisory.checkmarx.net/advisory/CX-2020-4276

Checkmarx Advisory | CX-2020-4276 / Mutation XSS in Mozilla-bleach via noscript
Exploit;Third Party Advisory

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