CVE-2024-53987: rails-html-sanitizer is responsible for sanitizing HTML fragments in Rails applications

Routine

MEDIUM 6.1DOWNGRADE

CVE-2024-53987 is a medium-severity flaw (CVSS 6.1) affecting rails html sanitizers. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

rails-html-sanitizer is responsible for sanitizing HTML fragments in Rails applications. There is a possible XSS vulnerability with certain configurations of Rails::HTML::Sanitizer 1.6.0 when used with Rails >= 7.1.0. A possible XSS vulnerability with certain configurations of Rails::HTML::Sanitizer may allow an attacker to inject content if HTML5 sanitization is enabled and the application developer has overridden the sanitizer's allowed tags wh

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

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	2024-12-02
Last modified	2026-06-17

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

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

Am I affected?

Timeline

2024-12-02 22:15 UTCPublished CVE record published
2026-06-17 08:09 UTCUpdated Record last modified

rubyonrails rails html sanitizers DOWNGRADE

Affected: 1.6.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.6.0

1. Check installed version

apt-cache policy rails-html-sanitizers || rpm -q rails-html-sanitizers || rails-html-sanitizers --version

2. No fixed release: DOWNGRADE to a release before 1.6.0 (Debian / Ubuntu)

apt-cache madison rails-html-sanitizers sudo apt install rails-html-sanitizers=<VERSION_BEFORE_1.6.0> sudo apt-mark hold rails-html-sanitizers

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list rails-html-sanitizers sudo dnf downgrade rails-html-sanitizers-<VERSION_BEFORE_1.6.0> sudo dnf versionlock add rails-html-sanitizers

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2024-53987?

rails html sanitizers: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2024-53987 being exploited?

CVE-2024-53987 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-2024-53987 affect?

CVE-2024-53987 affects rails html sanitizers. Severity is medium (CVSS 6.1). rails-html-sanitizer is responsible for sanitizing HTML fragments in Rails applications. There is a possible XSS vulnerability with certain configurations of Rails::HTML::Sanitizer 1.6.0 when used with Rails >= 7.1.0. A possible XSS vulnera

How urgent is CVE-2024-53987?

Priority 31/100. No elevated risk signals yet.

Software pages

Ruby on Rails vulnerabilities

Related CVEs

CVE-2024-53989 MEDIUM 6.1 DOWNGRADE rails-html-sanitizer is responsible for sanitizing HTML fragments in Rails applications
CVE-2024-53988 MEDIUM 6.1 DOWNGRADE rails-html-sanitizer is responsible for sanitizing HTML fragments in Rails applications
CVE-2024-53986 MEDIUM 6.1 DOWNGRADE rails-html-sanitizer is responsible for sanitizing HTML fragments in Rails applications
CVE-2024-53985 MEDIUM 6.1 DOWNGRADE rails-html-sanitizer is responsible for sanitizing HTML fragments in Rails applications

References

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