CVE-2026-88804 Unauthenticated update of public UI settings leading to stored cross-site scripting in Rancher
Unauthenticated attackers can inject malicious scripts into public UI settings, enabling stored cross-site scripting attacks against Rancher users.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-88804?
CVE-2026-88804 is a critical cross-site scripting vulnerability in SUSE Rancher, published on 28 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
An unauthenticated update of public UI settings could be used by remote attackers to execute a stored cross-site scripting attack in the Rancher UI, in SUSE Rancher 2.15 before 2.15.2, 2.14 before 2.14.6, 2.13 before 2.13.10, 2.12 before 2.12.14 and 2.11 before 2.11.18.
Weakness: CWE-79
Which versions are affected by CVE-2026-88804?
How do I fix CVE-2026-88804?
No fix has been published for CVE-2026-88804 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-88804 being exploited?
There is no known exploitation of CVE-2026-88804 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-992f-xh8r-jg2f.