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CVE-2026-73648

rails-html-sanitizer: Possible XSS vulnerability with certain configurations

5.1 MediumFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
Active

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
None

Exploit likelihood

0.55%Up 0.2 points since Aug 14, 2026
90%50%10%1%

What each source reports

CVE List Score used 5.1

rails-html-sanitizer: Possible XSS vulnerability with certain configurations

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.

Record
CVE-2026-73648
CVSS 4.0
5.1 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Weakness
CWE-79
Updated
2026-11-02
EUVDEUVD-2026-58191 5.1

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.

Record
EUVD-2026-58191
CVSS 4.0
5.1 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-cj75-f6xr-r4g7 5.1

Rails HTML Sanitizers: Possible XSS vulnerability with certain configurations

Summary

There is a possible cross-site scripting vulnerability in rails-html-sanitizer when the sanitizer is configured to allow an SVG reference element such as <use>. See related GHSA-9wjq-cp2p-hrgf in Loofah, whose SVG local-reference logic rails-html-sanitizer mirrors.

  • Versions affected: >= 1.0.3, < 1.7.1
  • Not affected: < 1.0.3
  • Fixed versions: 1.7.1

Impact

Rails::HTML::PermitScrubber restricts SVG reference elements in the SVG_ALLOW_LOCAL_HREF collection to local, same-document references, but that restriction covered only the xlink:href attribute. Browsers also accept a plain href attribute per the SVG 2 spec, and it was not restricted, so those elements could reference arbitrary external documents. SVG <use> can load and render external SVG content by reference, and if the referenced document is same-origin and contains scripts, it could execute in the context of the sanitized document. <feImage> can load external images, which can be used for tracking.

Applications are impacted only when the allowed tags are overridden to include one of these SVG reference elements, for example <use> or <feImage>. The default allowed tags do not include these SVG elements, so applications using the default configuration are not affected.

Workarounds

Remove the SVG reference elements (such as use and feImage) from the overridden allowed tags. Applications using the default allowed tags are not affected.

References

Credit

Found by maintainer Mike Dalessio during a security audit.

Record
GHSA-cj75-f6xr-r4g7
CVSS 4.0
5.1 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Weakness
CWE-79
Updated
2026-11-02
NVD 5.1

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.

Record
CVE-2026-73648
CVSS 4.0
5.1 MediumCVSS: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
Weakness
CWE-79
Updated
2026-11-02
OSV 5.1

rails-html-sanitizer: Possible XSS vulnerability with certain configurations

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.

Record
CVE-2026-73648
CVSS 4.0
5.1 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Weakness
CWE-79
Updated
2026-11-02
OSVDEBIAN-CVE-2026-73648 5.1

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.

Record
DEBIAN-CVE-2026-73648
CVSS 4.0
5.1 MediumCVSS: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
Updated
2026-11-02
Show 7 moreShow less
OSVGHSA-cj75-f6xr-r4g7 5.1

Rails HTML Sanitizers: Possible XSS vulnerability with certain configurations

Summary

There is a possible cross-site scripting vulnerability in rails-html-sanitizer when the sanitizer is configured to allow an SVG reference element such as <use>. See related GHSA-9wjq-cp2p-hrgf in Loofah, whose SVG local-reference logic rails-html-sanitizer mirrors.

  • Versions affected: >= 1.0.3, < 1.7.1
  • Not affected: < 1.0.3
  • Fixed versions: 1.7.1

Impact

Rails::HTML::PermitScrubber restricts SVG reference elements in the SVG_ALLOW_LOCAL_HREF collection to local, same-document references, but that restriction covered only the xlink:href attribute. Browsers also accept a plain href attribute per the SVG 2 spec, and it was not restricted, so those elements could reference arbitrary external documents. SVG <use> can load and render external SVG content by reference, and if the referenced document is same-origin and contains scripts, it could execute in the context of the sanitized document. <feImage> can load external images, which can be used for tracking.

Applications are impacted only when the allowed tags are overridden to include one of these SVG reference elements, for example <use> or <feImage>. The default allowed tags do not include these SVG elements, so applications using the default configuration are not affected.

Workarounds

Remove the SVG reference elements (such as use and feImage) from the overridden allowed tags. Applications using the default allowed tags are not affected.

References

Credit

Found by maintainer Mike Dalessio during a security audit.

Record
GHSA-cj75-f6xr-r4g7
CVSS 4.0
5.1 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Weakness
CWE-79
Updated
2026-11-02
OSVUBUNTU-CVE-2026-73648 5.1

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.

Record
UBUNTU-CVE-2026-73648
CVSS 4.0
5.1 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Updated
2026-11-02
OSVopenSUSE-SU-2026:12153-1 No score

hawk2-2.7.2+git.1792148770.648dcddb-1.1 on GA media

These are all security issues fixed in the hawk2-2.7.2+git.1792148770.648dcddb-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2026:12153-1
Updated
2026-11-02
OSVopenSUSE-SU-2026:22068-1 No score

Security update for hawk2

This update for hawk2 fixes the following issues:

  • CVE-2026-42246: net-imap: MITM attacker can cause Net::IMAP#starttls to return successfully, without starting TLS (bsc#1268996).
  • CVE-2026-66066: unsafe image processing operations on untrusted uploads can allow arbitrary file reading and remote code execution (bsc#1273348).
  • CVE-2026-71847: json: heap use-after free in JSON::ResumableParser partial_value can lead to crash on truncated duplicate-key streams (bsc#1275213).
  • CVE-2026-73490: loofah: improper handling of SVG attributes in the HTML5 sanitizer allows bypass of local-reference restrictions (bsc#1275179).
  • CVE-2026-73491: loofah: improper handling of javascript: URIs can lead to XSS (bsc#1275183).
  • CVE-2026-73492: loofah: improper handling of javascript: and vbscript: URIs can lead to XSS (bsc#1275188).
  • CVE-2026-73648: rails-html-sanitizer: cross-site scripting is possible when the sanitizer is configured to allow certain SVG reference elements (bsc#1275200).

Changes for hawk2:

  • Update to version 2.7.2+git.1788518533.7d4dadd6 (bsc#1275019):
  • Test: give sle15 more time when choosing between sle15 and sle16
  • Dev: bump jQuery version to 4.0.0
  • Dev: bump jQuery version to 3.5.0
  • Dev: bump jQuery version to 2.2.4
  • Test: update the e2e test for the change allowing custom parameters
  • Dev: enable custom Parameters and Meta Attributes (bsc#1274860)
  • CI/CD: update hawk examiner entry point
  • Test: enable test_add_clone against hawk-apiserver verion 0.2.1
  • Test: fix SyntaxWarning: invalid escape sequence '|'
  • Test: make the tests compatible against hawk-apiserver ver0.2.0
Record
openSUSE-SU-2026:22068-1
Updated
2026-11-02
OSVSUSE-SU-2026:24195-1 No score

Security update for hawk2

This update for hawk2 fixes the following issues:

  • CVE-2026-42246: net-imap: MITM attacker can cause Net::IMAP#starttls to return successfully, without starting TLS (bsc#1268996).
  • CVE-2026-66066: unsafe image processing operations on untrusted uploads can allow arbitrary file reading and remote code execution (bsc#1273348).
  • CVE-2026-71847: json: heap use-after free in JSON::ResumableParser partial_value can lead to crash on truncated duplicate-key streams (bsc#1275213).
  • CVE-2026-73490: loofah: improper handling of SVG attributes in the HTML5 sanitizer allows bypass of local-reference restrictions (bsc#1275179).
  • CVE-2026-73491: loofah: improper handling of javascript: URIs can lead to XSS (bsc#1275183).
  • CVE-2026-73492: loofah: improper handling of javascript: and vbscript: URIs can lead to XSS (bsc#1275188).
  • CVE-2026-73648: rails-html-sanitizer: cross-site scripting is possible when the sanitizer is configured to allow certain SVG reference elements (bsc#1275200).

Changes for hawk2:

  • Update to version 2.7.2+git.1788518533.7d4dadd6 (bsc#1275019):
  • Test: give sle15 more time when choosing between sle15 and sle16
  • Dev: bump jQuery version to 4.0.0
  • Dev: bump jQuery version to 3.5.0
  • Dev: bump jQuery version to 2.2.4
  • Test: update the e2e test for the change allowing custom parameters
  • Dev: enable custom Parameters and Meta Attributes (bsc#1274860)
  • CI/CD: update hawk examiner entry point
  • Test: enable test_add_clone against hawk-apiserver verion 0.2.1
  • Test: fix SyntaxWarning: invalid escape sequence '|'
  • Test: make the tests compatible against hawk-apiserver ver0.2.0
Record
SUSE-SU-2026:24195-1
Updated
2026-11-02
OSVSUSE-SU-2026:24250-1 No score

Security update for hawk2

This update for hawk2 fixes the following issues:

  • CVE-2026-42246: net-imap: MITM attacker can cause Net::IMAP#starttls to return successfully, without starting TLS (bsc#1268996).
  • CVE-2026-66066: unsafe image processing operations on untrusted uploads can allow arbitrary file reading and remote code execution (bsc#1273348).
  • CVE-2026-71847: json: heap use-after free in JSON::ResumableParser partial_value can lead to crash on truncated duplicate-key streams (bsc#1275213).
  • CVE-2026-73490: loofah: improper handling of SVG attributes in the HTML5 sanitizer allows bypass of local-reference restrictions (bsc#1275179).
  • CVE-2026-73491: loofah: improper handling of javascript: URIs can lead to XSS (bsc#1275183).
  • CVE-2026-73492: loofah: improper handling of javascript: and vbscript: URIs can lead to XSS (bsc#1275188).
  • CVE-2026-73648: rails-html-sanitizer: cross-site scripting is possible when the sanitizer is configured to allow certain SVG reference elements (bsc#1275200).

Changes for hawk2:

  • Update to version 2.7.2+git.1788518533.7d4dadd6 (bsc#1275019):
  • Test: give sle15 more time when choosing between sle15 and sle16
  • Dev: bump jQuery version to 4.0.0
  • Dev: bump jQuery version to 3.5.0
  • Dev: bump jQuery version to 2.2.4
  • Test: update the e2e test for the change allowing custom parameters
  • Dev: enable custom Parameters and Meta Attributes (bsc#1274860)
  • CI/CD: update hawk examiner entry point
  • Test: enable test_add_clone against hawk-apiserver verion 0.2.1
  • Test: fix SyntaxWarning: invalid escape sequence '|'
  • Test: make the tests compatible against hawk-apiserver ver0.2.0
Record
SUSE-SU-2026:24250-1
Updated
2026-11-02
OSVSUSE-SU-2026:4445-1 No score

Security update for rubygem-rails-html-sanitizer

This update for rubygem-rails-html-sanitizer fixes the following issue:

  • CVE-2026-73648: rails-html-sanitizer: cross-site scripting is possible when the sanitizer is configured to allow certain SVG reference elements (bsc#1275199).
Record
SUSE-SU-2026:4445-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
rails-html-sanitizer
RubyGems
 1.0.3 up to 1.7.1
1.7.1
ruby-rails-html-sanitizer
Debian:12
 All versions, plus listed versions
1.4.4-11.6.2-11.6.2-1~exp11.7.0-11.7.0-21.7.1-1
 None known
ruby-rails-html-sanitizer
Debian:13
 All versions, plus listed versions
1.6.2-11.7.0-11.7.0-21.7.1-1
 None known
ruby-rails-html-sanitizer
Debian:14
 before 1.7.1-1, plus listed versions
1.6.2-11.7.0-11.7.0-2
1.7.1-1
rails-html-sanitizer
RubyGems
 1.0.3 up to 1.7.1, plus listed versions
1.0.41.1.01.2.01.3.01.4.0
Show 11 moreShow less
1.4.11.4.21.4.31.4.41.5.01.6.01.6.0.rc11.6.0.rc21.6.11.6.21.7.0
1.7.1
hawk2
SUSE:Linux Enterprise High Availability Extension 16.0
From an advisory covering 7 CVEs
 before 2.7.2+git.1788518533.7d4dadd6-160000.1.1
2.7.2+git.1788518533.7d4dadd6-160000.1.1
hawk2
SUSE:Linux Enterprise Server for SAP applications 16.0
From an advisory covering 7 CVEs
 before 2.7.2+git.1788518533.7d4dadd6-160000.1.1
2.7.2+git.1788518533.7d4dadd6-160000.1.1
rubygem-rails-html-sanitizer
SUSE:Linux Enterprise High Availability Extension 15 SP4
 before 1.0.4-150000.4.9.1
1.0.4-150000.4.9.1
rubygem-rails-html-sanitizer
SUSE:Linux Enterprise High Availability Extension 15 SP5
 before 1.0.4-150000.4.9.1
1.0.4-150000.4.9.1
rubygem-rails-html-sanitizer
SUSE:Linux Enterprise High Availability Extension 15 SP6
 before 1.0.4-150000.4.9.1
1.0.4-150000.4.9.1
Show 9 moreShow less
Affected packages
PackageAffectedFixed
rubygem-rails-html-sanitizer
SUSE:Linux Enterprise High Availability Extension 15 SP7
 before 1.0.4-150000.4.9.1
1.0.4-150000.4.9.1
ruby-rails-html-sanitizer
Ubuntu:16.04:LTS
 All versions, plus listed versions
1.0.2-11.0.3-11.0.3-2
 None known
ruby-rails-html-sanitizer
Ubuntu:18.04:LTS
 All versions, plus listed versions
1.0.3-21.0.4-1
 None known
ruby-rails-html-sanitizer
Ubuntu:20.04:LTS
 All versions, plus listed versions
1.0.4-11.3.0-1
 None known
ruby-rails-html-sanitizer
Ubuntu:22.04:LTS
 All versions, plus listed versions
1.3.0-21.4.2-11.4.2-2
 None known
ruby-rails-html-sanitizer
Ubuntu:24.04:LTS
 All versions, plus listed versions
1.4.4-1
 None known
ruby-rails-html-sanitizer
Ubuntu:26.04:LTS
 All versions, plus listed versions
1.6.2-1
 None known
hawk2
openSUSE:Tumbleweed
From an advisory covering 7 CVEs
 before 2.7.2+git.1792148770.648dcddb-1.1
2.7.2+git.1792148770.648dcddb-1.1
hawk2
openSUSE:Leap 16.0
From an advisory covering 7 CVEs
 before 2.7.2+git.1788518533.7d4dadd6-160000.1.1
2.7.2+git.1788518533.7d4dadd6-160000.1.1

History

History
RecordedChangedSources
affected, facts
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-73648 is a medium vulnerability (CVSS 5.1) in Rails Rails-html-sanitizer, published July 21, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.55%, the 46th percentile. Fixed in rails-html-sanitizer 1.7.1.

References

Show 25 moreShow less
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