Bug 2527503 - CVE-2026-84371 prometheus: stored XSS via SVG SMIL URI-list scheme-policy bypass [fedora-all]
Summary: CVE-2026-84371 prometheus: stored XSS via SVG SMIL URI-list scheme-policy byp...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Fedora
Classification: Fedora
Component: prometheus
Version: rawhide
Hardware: Unspecified
OS: Unspecified
medium
medium
Target Milestone: ---
Assignee: Mikel Olasagasti Uranga
QA Contact:
URL:
Whiteboard: {"flaws": ["689f1508-9b4a-4bdd-8193-c...
Depends On:
Blocks: CVE-2026-84371
TreeView+ depends on / blocked
 
Reported: 2026-09-02 15:02 UTC by Guilherme de Almeida Suckevicz
Modified: 2026-10-04 01:41 UTC (History)
2 users (show)

Fixed In Version: prometheus-3.15.0-1.fc45 prometheus-3.15.0-1.fc44
Clone Of:
Environment:
Last Closed: 2026-10-03 04:41:55 UTC
Type: ---
Embargoed:


Attachments (Terms of Use)

Description Guilherme de Almeida Suckevicz 2026-09-02 15:02:07 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 20:10:57 UTC
FEDORA-2026-0ed67903d8 (prometheus-3.15.0-1.fc45) has been submitted as an update to Fedora 45.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-0ed67903d8

Comment 2 Fedora Update System 2026-09-25 20:11:13 UTC
FEDORA-2026-1e56ab167d (prometheus-3.15.0-1.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-1e56ab167d

Comment 3 Fedora Update System 2026-09-26 01:48:33 UTC
FEDORA-2026-0ed67903d8 has been pushed to the Fedora 45 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-0ed67903d8`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-0ed67903d8

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

Comment 4 Fedora Update System 2026-09-26 02:04:58 UTC
FEDORA-2026-1e56ab167d has been pushed to the Fedora 44 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-1e56ab167d`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-1e56ab167d

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

Comment 5 Fedora Update System 2026-10-03 04:41:55 UTC
FEDORA-2026-0ed67903d8 (prometheus-3.15.0-1.fc45) has been pushed to the Fedora 45 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 6 Fedora Update System 2026-10-04 01:41:59 UTC
FEDORA-2026-1e56ab167d (prometheus-3.15.0-1.fc44) has been pushed to the Fedora 44 stable repository.
If problem still persists, please make note of it in this bug report.


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