# CVE-2026-85159: AVideo Reflected XSS via cancelUri in userLogin.php

> Unauthenticated attackers can execute arbitrary JavaScript in user browsers via reflected XSS in the login page's cancelUri parameter.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N`)
- **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:** 3 Sep 2026
- **Updated:** 5 Sep 2026
- **Also known as:** GHSA-gr2c-r9h3-6533, GHSA-mw3g-2292-vw4c

## What is CVE-2026-85159?

CVE-2026-85159 is a medium-severity cross-site scripting vulnerability in WWBN AVideo, published on 3 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

AVideo through commit c91b5975d contains a reflected cross-site scripting vulnerability in userLogin.php where the cancelUri parameter is echoed in an href attribute after isSafeRedirectURL checks protocol only, not HTML characters. Unauthenticated attackers can inject event handlers via relative URLs with embedded quotes to execute arbitrary JavaScript when users interact with the Cancel button.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-85159?


## How do I fix CVE-2026-85159?

No fix has been published for CVE-2026-85159 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-85159 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-85159 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-85159 and fix it if it is affected.

What it is: CVE-2026-85159 is a medium-severity cross-site scripting vulnerability in WWBN AVideo, published on 3 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: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-85159 exists.

Affected product: WWBN AVideo. 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-2026-85159/ (Markdown: https://insights.sbomify.com/CVE-2026-85159/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-85159
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-85159
- OSV: https://osv.dev/vulnerability/CVE-2026-85159

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-85159/
Summaries are generated and may contain mistakes; the official description above is the record.