CVE-2023-51652: OWASP AntiSamy .NET is a library for performing cleansing of HTML coming from untrusted sources

Q: How do I fix CVE-2023-51652?

owasp antisamy .net: upgrade to 1.2.0. Exact commands for each OS are on this page.

Q: Is CVE-2023-51652 being exploited?

CVE-2023-51652 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-2023-51652 affect?

CVE-2023-51652 affects owasp antisamy .net. Severity is medium (CVSS 6.1). OWASP AntiSamy .NET is a library for performing cleansing of HTML coming from untrusted sources. Prior to version 1.2.0, there is a potential for a mutation cross-site scripting (mXSS) vulnerability in AntiSamy caused by flawed parsing of t

Q: How urgent is CVE-2023-51652?

Priority 31/100. No elevated risk signals yet.

Routine

MEDIUM 6.1UPGRADE

CVE-2023-51652 is a medium-severity flaw (CVSS 6.1) affecting owasp antisamy .net. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

OWASP AntiSamy .NET is a library for performing cleansing of HTML coming from untrusted sources. Prior to version 1.2.0, there is a potential for a mutation cross-site scripting (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 in

Why this priority

No elevated risk signals yet

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	0.4% (top 61%)
CISA exploited list	No
Weakness	CWE-79
Published	2024-01-02
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: spassarop

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

Am I affected?

Timeline

2024-01-02 20:15 UTCPublished CVE record published
2026-06-17 06:41 UTCUpdated Record last modified

spassarop owasp antisamy .net UPGRADE

Affected: < 1.2.0

Fixed in: 1.2.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy owasp-antisamy-.net || rpm -q owasp-antisamy-.net || owasp-antisamy-.net --version

2. UPGRADE to 1.2.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade owasp-antisamy-.net

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade owasp-antisamy-.net

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-2023-51652?

owasp antisamy .net: upgrade to 1.2.0. Exact commands for each OS are on this page.

Is CVE-2023-51652 being exploited?

CVE-2023-51652 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-2023-51652 affect?

CVE-2023-51652 affects owasp antisamy .net. Severity is medium (CVSS 6.1). OWASP AntiSamy .NET is a library for performing cleansing of HTML coming from untrusted sources. Prior to version 1.2.0, there is a potential for a mutation cross-site scripting (mXSS) vulnerability in AntiSamy caused by flawed parsing of t

How urgent is CVE-2023-51652?

Priority 31/100. No elevated risk signals yet.

References

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