# CVE-2026-29934: Cross-site scripting in n/a

> Attackers can execute arbitrary JavaScript in the context of the user's browser via a reflected XSS vulnerability in the admin menus component.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A: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:** 26 Mar 2026
- **Updated:** 10 May 2026
- **Also known as:** GHSA-phpm-chh7-7xg9

## What is CVE-2026-29934?

CVE-2026-29934 is a medium-severity cross-site scripting vulnerability in n/a, published on 26 Mar 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

A reflected cross-site scripting (XSS) vulnerability in the /admin/menus component of Lightcms v2.0 allows attackers to execute arbitrary Javascript in the context of the user's browser via modifying the referer value in the request header.

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

## Which versions are affected by CVE-2026-29934?

It affects 1 product.


Products: Lightcms Project Lightcms.

## How do I fix CVE-2026-29934?

No fix has been published for CVE-2026-29934 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-29934 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-29934 exists.

## Other vulnerabilities in n/a

- [CVE-2023-27060](https://insights.sbomify.com/CVE-2023-27060/): Code injection in n/a (critical 9.8)
- [CVE-2021-27112](https://insights.sbomify.com/CVE-2021-27112/): Server-side request forgery in n/a (critical 9.8)
- [CVE-2024-22559](https://insights.sbomify.com/CVE-2024-22559/): Cross-site scripting in n/a (medium 5.4)
- [CVE-2021-3355](https://insights.sbomify.com/CVE-2021-3355/): Cross-site scripting in n/a (medium 5.4)
- [CVE-2022-33009](https://insights.sbomify.com/CVE-2022-33009/): Cross-site scripting in n/a (medium 4.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-29934 and fix it if it is affected.

What it is: CVE-2026-29934 is a medium-severity cross-site scripting vulnerability in n/a, published on 26 Mar 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-2026-29934 exists.

Affected product: n/a. 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-2026-29934/ (Markdown: https://insights.sbomify.com/CVE-2026-29934/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-29934
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-29934
- OSV: https://osv.dev/vulnerability/CVE-2026-29934

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-29934/
Summaries are generated and may contain mistakes; the official description above is the record.