Fedora 43 Nextcloud 33.0.3 Security Advisory 2026-6599e30e04 Critical RCE
fedora
May 11, 2026
33.0.3 Release
Summary
NextCloud gives you universal access to your files through a web interface or
WebDAV. It also provides a platform to easily view & sync your contacts,
calendars and bookmarks across all your devices and enables basic editing right
on the web. NextCloud is extendable via a simple but powerful API for
applications and plugins.
Update Information:
33.0.3 Release
Topics Covered
Change Log
* Sat May 2 2026 Andrew Bauer
References
[ 1 ] Bug #2452582 - CVE-2026-33916 nextcloud: Handlebars: Cross-Site Scripting (XSS) via prototype pollution in partial resolution [fedora-all]
https://bugzilla.redhat.com/show_bug.cgi?id=2452582
[ 2 ] Bug #2452588 - CVE-2026-33937 nextcloud: Handlebars: Remote Code Execution via crafted Abstract Syntax Tree object in compile() [epel-all]
https://bugzilla.redhat.com/show_bug.cgi?id=2452588
[ 3 ] Bug #2452590 - CVE-2026-33938 nextcloud: Handlebars: Arbitrary code execution via @partial-block overwrite [epel-all]
https://bugzilla.redhat.com/show_bug.cgi?id=2452590
[ 4 ] Bug #2452593 - CVE-2026-33939 nextcloud: Handlebars.js: Denial of Service via malformed decorator syntax in template compilation [epel-all]
https://bugzilla.redhat.com/show_bug.cgi?id=2452593
[ 5 ] Bug #2452596 - CVE-2026-33940 nextcloud: Handlebars.js: Arbitrary code execution via crafted template context [epel-all]
https://bugzilla.redhat.com/show_bug.cgi?id...
Update Instructions
This update can be installed with the "dnf" update program. Use su -c 'dnf upgrade --advisory FEDORA-2026-6599e30e04' at the command line. For more information, refer to the dnf documentation available at http://dnf.readthedocs.io/en/latest/command_ref.html#upgrade-command-label
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Name: nextcloud
Product: Fedora 43
Version: 33.0.3
Release: 1.fc43
URL: http://nextcloud.com
Summary: Private file sync and share server
Topics Covered
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