# 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.

- **Severity:** Critical 9.6 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H`)
- **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 available:** No
- **Published:** 28 Sep 2026
- **Updated:** 28 Sep 2026
- **Also known as:** GHSA-992f-xh8r-jg2f

## 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 (Improper Neutralization of Input During Web Page Generation)

## 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.

## 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:

- PoC CVE-2026-88804 (Rancher) (github_poc): https://github.com/R0gfall/CVE-2026-88804

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-88804 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-88804 in the wild and no public exploit code.

Affected product: SUSE Rancher. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-88804/ (Markdown: https://insights.sbomify.com/CVE-2026-88804/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-88804
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-88804
- OSV: https://osv.dev/vulnerability/CVE-2026-88804

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-88804/
Summaries are generated and may contain mistakes; the official description above is the record.