Predictive Vulnerability Intelligence.

Product

  • Product
  • Pricing
  • Documentation

Company

  • About
  • Partnerships
  • Blog
  • Support

Legal

  • Terms
  • Privacy
  • Data Licensing

© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2020-6816

22
FAUCET Score

CVE-2020-6816 describes a mutation Cross-Site Scripting (XSS) vulnerability in Mozilla Bleach versions prior to 3.12, affecting fedoraproject bleach and fedoraproject fedora. This medium-severity vulnerability (CVSS 6.1) can be triggered when bleach.clean is used with RCDATA and either SVG or Math tags whitelisted, and the 'strip' argument set to False, requiring user interaction for exploitation. There is no evidence of active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 3.1.2CPE matchmatch criteria
cpe:2.3:a:mozilla:bleach:*:*:*:*:*:*:*:*
33CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*

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
1.30%
Probability of exploitation in next 30 days
EPSS Percentile
67.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0130 is in the 80th percentile among its peer group of 26,219 CVEs.

Social Chatter

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: 3.1.2
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-m6xf-fq7q-8743medium

Bleach vulnerable to mutation XSS via whitelisted math or svg and raw tag

Mar 24, 2020

References

advisory.checkmarx.net / advisory/CX-2020-4277
ExploitThird Party Advisory
github.com / mozilla/bleach/security/advisories/GHSA-m6xf-fq7q-8743
Third Party Advisory
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/EDQU2SZLZMSSACCBUBJ6NOSRNNBDYFW5
checkmarx.com / blog/vulnerabilities-discovered-in-mozilla-bleach
ExploitThird Party Advisory