Bug 2495071

Summary:	CVE-2026-53606 python-jupytext: sanitize-html: Cross-Site Scripting (XSS) via insufficient URI scheme validation [fedora-all]
Product:	[Fedora] Fedora	Reporter:	Matteo Signorini <msignori>
Component:	python-jupytext	Assignee:	Jerry James <loganjerry>
Status:	ON_QA ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	45	CC:	loganjerry
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["b89f78a4-8821-4193-ac2e-83bc915a1eba"]}
Fixed In Version:		Doc Type:	---
Doc Text:		Story Points:	---
Clone Of:		Environment:
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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:	2488561

Description Matteo Signorini 2026-06-30 17:21:13 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. Versions of sanitize-html prior to 2.17.5 use `allowedSchemesAppliedToAttributes` (default: `['href', 'src', 'cite']`) to gate the `naughtyHref()` function that blocks dangerous URI schemes like `javascript:` and `vbscript:`. The HTML specification defines 10+ attributes that accept URIs (`action`, `formaction`, `data`, `poster`, `background`, `ping`, `xlink:href`, `dynsrc`, `lowsrc`), but none of these are included in the default gate list. When a developer allows any of these attributes in their configuration, `javascript:` URIs pass through completely unmodified, enabling XSS. Version 2.17.5 patches the issue.

Comment 1 Aoife Moloney 2026-08-17 15:07:40 UTC

This bug appears to have been reported against 'rawhide' during the Fedora Linux 45 development cycle.
Changing version to 45.

Comment 2 Fedora Update System 2026-10-05 19:44:31 UTC

FEDORA-2026-3942ab86fd (python-jupytext-1.19.6-1.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-3942ab86fd

Comment 3 Fedora Update System 2026-10-06 01:23:42 UTC

FEDORA-2026-8b0bf60fcb 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-2026-8b0bf60fcb`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-8b0bf60fcb

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

Comment 4 Fedora Update System 2026-10-06 01:56:43 UTC

FEDORA-2026-620e232420 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-2026-620e232420`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-620e232420

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

Comment 5 Fedora Update System 2026-10-06 02:26:21 UTC

FEDORA-2026-3942ab86fd has been pushed to the Fedora 43 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-3942ab86fd`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-3942ab86fd

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