Bug 2535906

Summary: CVE-2026-75838 nextcloud: DOMPurify: Cross-Site Scripting via IN_PLACE sanitization [fedora-all]
Product: [Fedora] Fedora Reporter: Ganesh <gnaik>
Component: nextcloudAssignee: Andrew Bauer <zonexpertconsulting>
Status: CLOSED ERRATA QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: high Docs Contact:
Priority: high    
Version: rawhideCC: pampelmuse, zonexpertconsulting
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["2e341d54-6b3b-4b3f-ba10-9c3ba4b1d25c"]}
Fixed In Version: nextcloud-34.0.4-1.fc45 nextcloud-34.0.4-1.el10_4 nextcloud-34.0.4-1.el10_2 nextcloud-34.0.4-1.el10_3 nextcloud-34.0.4-1.fc44 nextcloud-34.0.4-1.fc43 Doc Type: ---
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2026-09-28 00:16:48 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: 2517772    

Description Ganesh 2026-09-17 09:11:25 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.

DOMPurify before 3.4.13 contains a cross-site scripting vulnerability in IN_PLACE sanitization where element-removal hooks fail to neutralize detached subtrees. Attackers can supply HTML with event handlers on descendant elements that execute after sanitization completes, even though the returned root appears clean.

Comment 1 Fedora Update System 2026-09-19 20:08:55 UTC
FEDORA-2026-5c1bbb46c3 (nextcloud-34.0.4-1.fc45) has been submitted as an update to Fedora 45.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-5c1bbb46c3

Comment 2 Fedora Update System 2026-09-19 20:09:26 UTC
FEDORA-2026-362f1943c8 (nextcloud-34.0.4-1.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-362f1943c8

Comment 3 Fedora Update System 2026-09-19 20:10:25 UTC
FEDORA-2026-c495e95154 (nextcloud-34.0.4-1.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-c495e95154

Comment 4 Fedora Update System 2026-09-19 20:11:04 UTC
FEDORA-EPEL-2026-9f20c01514 (nextcloud-34.0.4-1.el10_4) has been submitted as an update to Fedora EPEL 10.4.
https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-9f20c01514

Comment 5 Fedora Update System 2026-09-19 20:19:14 UTC
FEDORA-EPEL-2026-d1bff6d983 (nextcloud-34.0.4-1.el10_2) has been submitted as an update to Fedora EPEL 10.2.
https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-d1bff6d983

Comment 6 Fedora Update System 2026-09-19 20:19:14 UTC
FEDORA-EPEL-2026-31615b47ef (nextcloud-34.0.4-1.el10_3) has been submitted as an update to Fedora EPEL 10.3.
https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-31615b47ef

Comment 7 Fedora Update System 2026-09-20 01:41:58 UTC
FEDORA-2026-c495e95154 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-c495e95154`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-c495e95154

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

Comment 8 Fedora Update System 2026-09-20 01:47:53 UTC
FEDORA-EPEL-2026-9f20c01514 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-2026-9f20c01514

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

Comment 9 Fedora Update System 2026-09-20 02:02:07 UTC
FEDORA-2026-362f1943c8 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-2026-362f1943c8`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-362f1943c8

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

Comment 10 Fedora Update System 2026-09-20 02:02:49 UTC
FEDORA-EPEL-2026-d1bff6d983 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-d1bff6d983

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

Comment 11 Fedora Update System 2026-09-20 02:08:01 UTC
FEDORA-EPEL-2026-31615b47ef 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-2026-31615b47ef

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

Comment 12 Fedora Update System 2026-09-20 02:24:49 UTC
FEDORA-2026-5c1bbb46c3 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-2026-5c1bbb46c3`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-5c1bbb46c3

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

Comment 13 Fedora Update System 2026-09-28 00:16:48 UTC
FEDORA-2026-5c1bbb46c3 (nextcloud-34.0.4-1.fc45) has been pushed to the Fedora 45 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 14 Fedora Update System 2026-09-28 00:30:51 UTC
FEDORA-EPEL-2026-9f20c01514 (nextcloud-34.0.4-1.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 15 Fedora Update System 2026-09-28 00:53:08 UTC
FEDORA-EPEL-2026-d1bff6d983 (nextcloud-34.0.4-1.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 16 Fedora Update System 2026-09-28 01:11:26 UTC
FEDORA-EPEL-2026-31615b47ef (nextcloud-34.0.4-1.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 17 Fedora Update System 2026-09-28 01:13:34 UTC
FEDORA-2026-362f1943c8 (nextcloud-34.0.4-1.fc44) has been pushed to the Fedora 44 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 18 Fedora Update System 2026-09-28 01:17:12 UTC
FEDORA-2026-c495e95154 (nextcloud-34.0.4-1.fc43) has been pushed to the Fedora 43 stable repository.
If problem still persists, please make note of it in this bug report.