Bug 2527488

Summary: CVE-2026-84371 prometheus: stored XSS via SVG SMIL URI-list scheme-policy bypass [epel-all]
Product: [Fedora] Fedora EPEL Reporter: Guilherme de Almeida Suckevicz <gsuckevi>
Component: prometheusAssignee: Mikel Olasagasti Uranga <mikel>
Status: CLOSED ERRATA QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: epel10CC: go-sig, mikel
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["689f1508-9b4a-4bdd-8193-c66bc80a8605"]}
Fixed In Version: prometheus-3.15.0-1.el10_4 prometheus-3.15.0-1.el10_3 prometheus-3.15.0-1.el10_2 prometheus-3.15.0-1.el9 Doc Type: ---
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2026-10-04 00:30:07 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 2527092    

Description Guilherme de Almeida Suckevicz 2026-09-02 15:00:31 UTC
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

ApostropheCMS is an open-source Node.js content management system, and sanitize-html provides a simple HTML sanitizer with a clear API. From version 1.9.0 until version 2.17.7, packages/sanitize-html/index.js validates an animation value attribute as one flat URL and does not recognize that attributeName selecting href or xlink:href gives the sibling values, from, to, or by attribute SVG SMIL URL semantics. In configurations that allow the animate, animateColor, animateMotion, animateTransform, or set elements, a values list can begin with a safe fragment and contain a later executable destination that survives allowedSchemesAppliedToAttributes checking. When the sanitized SVG is rendered, the browser can copy that later destination into the live link, and a victim who activates the link can execute script in the application's origin. This issue is fixed in version 2.17.7.

Comment 1 Fedora Update System 2026-09-25 20:09:57 UTC
FEDORA-EPEL-2026-107b1939e2 (prometheus-3.15.0-1.el10_3) has been submitted as an update to Fedora EPEL 10.3.
https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-107b1939e2

Comment 2 Fedora Update System 2026-09-25 20:10:13 UTC
FEDORA-EPEL-2026-de6f0d9586 (prometheus-3.15.0-1.el10_4) has been submitted as an update to Fedora EPEL 10.4.
https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-de6f0d9586

Comment 3 Fedora Update System 2026-09-25 20:10:27 UTC
FEDORA-EPEL-2026-1c3b7b89de (prometheus-3.15.0-1.el9) has been submitted as an update to Fedora EPEL 9.
https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-1c3b7b89de

Comment 4 Fedora Update System 2026-09-26 02:01:45 UTC
FEDORA-EPEL-2026-1c3b7b89de has been pushed to the Fedora EPEL 9 testing repository.

You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-1c3b7b89de

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 5 Fedora Update System 2026-09-26 02:15:20 UTC
FEDORA-EPEL-2026-de6f0d9586 has been pushed to the Fedora EPEL 10.4 testing repository.

You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-de6f0d9586

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 6 Fedora Update System 2026-09-26 02:18:13 UTC
FEDORA-EPEL-2026-107b1939e2 has been pushed to the Fedora EPEL 10.3 testing repository.

You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-107b1939e2

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 7 Fedora Update System 2026-09-26 02:21:00 UTC
FEDORA-EPEL-2026-9123d16389 has been pushed to the Fedora EPEL 10.2 testing repository.

You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-9123d16389

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 8 Fedora Update System 2026-10-04 00:30:07 UTC
FEDORA-EPEL-2026-de6f0d9586 (prometheus-3.15.0-1.el10_4) has been pushed to the Fedora EPEL 10.4 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 9 Fedora Update System 2026-10-04 01:10:37 UTC
FEDORA-EPEL-2026-107b1939e2 (prometheus-3.15.0-1.el10_3) has been pushed to the Fedora EPEL 10.3 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 10 Fedora Update System 2026-10-04 01:25:36 UTC
FEDORA-EPEL-2026-9123d16389 (prometheus-3.15.0-1.el10_2) has been pushed to the Fedora EPEL 10.2 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 11 Fedora Update System 2026-10-04 01:43:58 UTC
FEDORA-EPEL-2026-1c3b7b89de (prometheus-3.15.0-1.el9) has been pushed to the Fedora EPEL 9 stable repository.
If problem still persists, please make note of it in this bug report.