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CVE-2020-6802

17
FAUCET Score

CVE-2020-6802 is a medium-severity mutation Cross-Site Scripting (XSS) vulnerability affecting Mozilla Bleach versions prior to 3.11, as well as related Fedora Project products. It allows an unauthenticated attacker to inject malicious scripts when bleach.clean is used with specific configurations (noscript and raw tags in allowed options), potentially leading to client-side code execution and limited impact on confidentiality and integrity. While the CVSS score is 6.1, there is no evidence of active exploitation, publicly available exploit code, or significant community discussion, suggesting a low current threat level.

Impacted Technologies

VendorProductVersion(s)CPE
< 3.1.1CPE matchmatch criteria
cpe:2.3:a:mozilla:bleach:*:*:*:*:*:*:*:*
30CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*
31CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*
32CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.1MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.69%
Probability of exploitation in next 30 days
EPSS Percentile
74.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0169 is in the 87th percentile among its peer group of 26,209 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (4)

pippatch availablevia ghsa
Product: bleachFixed in: 3.1.1
ubuntupatch availablevia ubuntu_usn
Product: python-bleach (focal)Fixed in: 3.1.1-1ubuntu0.1~esm1
ubuntupatch availablevia ubuntu_usn
Product: python-bleach (xenial)Fixed in: 1.4.2-1ubuntu0.1~esm1
ubuntupatch availablevia ubuntu_usn
Product: python-bleach (bionic)Fixed in: 2.1.2-1ubuntu0.1~esm1

Vendor Advisories (2)

ubuntuUSN-8077-1

Bleach vulnerabilities

Mar 5, 2026
pipGHSA-q65m-pv3f-wr5rmedium

XSS in Bleach when noscript and raw tag whitelisted

Feb 24, 2020

References

advisory.checkmarx.net / advisory/CX-2020-4276
ExploitThird Party Advisory
github.com / mozilla/bleach/security/advisories/GHSA-q65m-pv3f-wr5r
Third Party Advisory
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/72R4VFFHDRSQMNT7IZU3X2755ZP4HGNI
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/OCNLM2MGQTOLCIVVYS2Z5S7KOQJR5JC4
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/YTULPQB7HVPPYWEYVNHJGDTSPVIDHIZX
checkmarx.com / blog/vulnerabilities-discovered-in-mozilla-bleach
ExploitThird Party Advisory