CVE-2023-43643: AntiSamy is a library for performing fast, configurable cleansing of HTML coming from untrusted sources

Q: How do I fix CVE-2023-43643?

antisamy: upgrade to 1.7.4. Exact commands for each OS are on this page.

Q: Is CVE-2023-43643 being exploited?

CVE-2023-43643 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2023-43643 affect?

CVE-2023-43643 affects antisamy. Severity is medium (CVSS 6.1). AntiSamy is a library for performing fast, configurable cleansing of HTML coming from untrusted sources. Prior to version 1.7.4, there is a potential for a mutation XSS (mXSS) vulnerability in AntiSamy caused by flawed parsing of the HTML b

Q: How urgent is CVE-2023-43643?

Priority 38/100. Public exploit reference

Routine

MEDIUM 6.1UPGRADE

CVE-2023-43643 is a medium-severity flaw (CVSS 6.1) affecting antisamy. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

AntiSamy is a library for performing fast, configurable cleansing of HTML coming from untrusted sources. Prior to version 1.7.4, there is a potential for a mutation XSS (mXSS) vulnerability in AntiSamy caused by flawed parsing of the HTML being sanitized. To be subject to this vulnerability the `preserveComments` directive must be enabled in your policy file and also allow for certain tags at the same time. As a result, certain crafty inputs can

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.5% (top 55%)
CISA exploited list	No
Weakness	CWE-79
Published	2023-10-09
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: antisamy project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-10-09 14:15 UTCPublished CVE record published
2026-06-17 06:26 UTCUpdated Record last modified

antisamy project antisamy UPGRADE

Affected: < 1.7.4

Fixed in: 1.7.4

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy antisamy || rpm -q antisamy || antisamy --version

2. UPGRADE to 1.7.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade antisamy

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade antisamy

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-43643?

antisamy: upgrade to 1.7.4. Exact commands for each OS are on this page.

Is CVE-2023-43643 being exploited?

CVE-2023-43643 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-43643 affect?

CVE-2023-43643 affects antisamy. Severity is medium (CVSS 6.1). AntiSamy is a library for performing fast, configurable cleansing of HTML coming from untrusted sources. Prior to version 1.7.4, there is a potential for a mutation XSS (mXSS) vulnerability in AntiSamy caused by flawed parsing of the HTML b

How urgent is CVE-2023-43643?

Priority 38/100. Public exploit reference

Related CVEs

CVE-2024-23635 MEDIUM 6.1 UPGRADE AntiSamy is a library for performing fast, configurable cleansing of HTML coming from untrusted sources

References

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