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rails-html-sanitizer CVE-2026-73648

| EUVDEUVD-2026-58191 MEDIUM
Cross-site Scripting (XSS) (CWE-79)
2026-08-13 security-advisories@github.com
XSS Red Hat Suse
5.1
CVSS 4.0 · Vendor: github
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Severity by source

Vendor (github) PRIMARY
5.1 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
4.4 MEDIUM

AC:H reflects the non-default configuration prerequisite; PR:L because submitting content typically requires some application access; S:C and UI:R because victim browser action resolves the cross-document SVG reference.

3.1 AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N
4.0 AV:N/AC:H/AT:P/PR:L/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
SUSE
6.1 MEDIUM
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Red Hat
5.4 MEDIUM
qualitative

Primary rating from Vendor (github).

CVSS VectorVendor: github

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
A
Scope
X

Lifecycle Timeline

3
Patch available
Aug 13, 2026 - 19:04 EUVD
Source Code Evidence Fetched
Aug 13, 2026 - 18:36 vuln.today
Analysis Generated
Aug 13, 2026 - 18:36 vuln.today

DescriptionCVE.org

rails-html-sanitizer is responsible for sanitizing HTML fragments in Rails applications. From 1.0.3 until 1.7.1, Rails::HTML::PermitScrubber restricted SVG reference elements in SVG_ALLOW_LOCAL_HREF only when they used xlink:href, even though browsers also accept the plain href attribute. Applications with non-default allowed tags that included SVG use or feImage elements could therefore permit external references; a same-origin external SVG referenced by use could execute scripts in the sanitized document's context, while feImage could load external images for tracking. Applications using the default allowed tags are not affected. This issue is fixed in version 1.7.1.

AnalysisAI

Cross-site scripting in rails-html-sanitizer 1.0.3-1.7.0 allows external SVG references to bypass sanitization when applications use non-default allowed tags including SVG reference elements such as 'use' or 'feImage'. The PermitScrubber correctly blocked external hrefs via the legacy 'xlink:href' attribute but failed to apply the same restriction to the SVG 2 plain 'href' attribute, which modern browsers also honor. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Submit SVG markup with plain href to content field
Delivery
Application sanitizer passes 'use' element due to missing href check
Exploit
Victim loads page with sanitized content
Execution
Browser resolves SVG 'use' href to same-origin external SVG
Persist
External SVG scripts execute in document context
Impact
Attacker achieves XSS (session theft or DOM manipulation)
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Vulnerability AssessmentAI

Exploitation Exploitation requires the application to have explicitly overridden the default rails-html-sanitizer allowed-tag list to include at least one SVG reference element - specifically 'use' or 'feImage'. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:A, score 5.1) correctly reflects the moderate real-world risk: network-reachable with no special attack complexity, but user interaction is required and downstream system impact is limited to low confidentiality and low integrity changes (SC:L/SI:L). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker submits user-generated content containing an SVG 'use' element with a plain 'href' pointing to a same-origin SVG file that includes a script payload. The sanitizer, misconfigured to allow 'use' and 'href', passes the element through intact. …
Remediation Upgrade rails-html-sanitizer to version 1.7.1, which contains the corrected attribute name check in PermitScrubber and pins loofah to >= 2.25.2. … Detailed patch versions, workarounds, and compensating controls in full report.
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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise High Availability Extension 15 SP7 Not-Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 Affected
SUSE Linux Enterprise High Availability Extension 16.0 Affected
SUSE Linux Enterprise High Availability Extension 16.1 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected

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CVE-2026-73648 vulnerability details – vuln.today
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