Medium [CVE-2026-64728] Maliciously crafted web content may violate iframe sandboxing policy
This medium-severity Red Hat Linux advisory covers CVE-2026-64728 affecting Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7.
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Summary
A permissions issue was addressed with improved validation. This issue is fixed in Safari 26.6, iOS 26.6 and iPadOS 26.6, macOS Tahoe 26.6, tvOS 26.6, visionOS 26.6, watchOS 26.6.
Maliciously crafted web content may violate iframe sandboxing policy. A flaw was found in WebKitGTK.
To exploit this flaw, an attacker needs to trick a user into processing or loading malicious web content. Due to this reason, this flaw has been rated with a moderate severity.
Red Hat severity: Moderate — CVSS 6.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N). Weakness: CWE-693.
Affected Red Hat products: Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8. Will not fix / out of support: Red Hat Enterprise Linux 6.
Red Hat fixing advisory: RHSA-2026:69098.
Affected products named by the advisory: Red Hat package: webkit2gtk3; Red Hat package: webkitgtk4.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 10 days ago·verify at source
- 26.6
- webkit2gtk3-0:2.54.0-1.el9_8
- RHSA-2026:69098
Official advisory · high-confidence parse· fetched 10 days ago·verify at source
Mitigation checklist
- Do not process or load untrusted web content with WebKitGTK. In Red Hat Enterprise Linux 7, the following packages require WebKitGTK4: evolution-data-server, glade, gnome-boxes, gnome-initial-setup, gnome-online-accounts, gnome-shell, shotwell, sushi and yelp. This vulnerability can only be exploited when these packages are installed in the system and being used via a graphical interface to process untrusted web content, via GNOME for example. In gnome-shell, the vulnerability can be exploited by an attacker from the local network without user interaction. To mitigate this vulnerability, consider removing these packages. Note that some of these packages are required by GNOME, removing them will also remove GNOME and other packages, breaking functionality. However, the server can still be used via the terminal interface. Additionally, WebKitGTK3 is not required by any package. Therefore, it can be removed without consequences or break of functionality.
Official advisory · high-confidence parse· fetched 10 days ago·verify at source
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