# CVE-2026-2952: Vaelsys HTTP POST Request tree_server.php os command injection

> Remote attackers can execute arbitrary OS commands via the xajaxargs parameter in tree_server.php, leading to full system compromise.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 22 Feb 2026
- **Updated:** 25 Feb 2026
- **Also known as:** GHSA-fwf8-cx3q-ch9g

## What is CVE-2026-2952?

CVE-2026-2952 is a medium-severity command injection vulnerability in Vaelsys, published on 22 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A flaw has been found in Vaelsys 4.1.0. This vulnerability affects unknown code of the file /tree/tree_server.php of the component HTTP POST Request Handler. This manipulation of the argument xajaxargs causes os command injection. The attack is possible to be carried out remotely. The exploit has been published and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Weakness: CWE-78 (Improper Neutralization of Special Elements used in an OS Command), CWE-77 (Improper Neutralization of Special Elements used in a Command)

## Which versions are affected by CVE-2026-2952?

It affects 1 product.


Products: Vaelsys Vaelsys.

## How do I fix CVE-2026-2952?

No fix has been published for CVE-2026-2952 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-2952 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-2952 exists.

## Other vulnerabilities in Vaelsys

- [CVE-2025-8259](https://insights.sbomify.com/CVE-2025-8259/): Vaelsys VaelsysV4 Web interface vgrid_server.php execute_DataObjectProc os command injection (medium 6.9)
- [CVE-2025-8261](https://insights.sbomify.com/CVE-2025-8261/): Vaelsys VaelsysV4 User Creation vgrid_server.php improper authorization (medium 6.9)
- [CVE-2025-8260](https://insights.sbomify.com/CVE-2025-8260/): Vaelsys VaelsysV4 Web interface vgrid_server.php weak hash (low 2.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-2952 and fix it if it is affected.

What it is: CVE-2026-2952 is a medium-severity command injection vulnerability in Vaelsys, published on 22 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-2952 exists.

Affected product: Vaelsys. 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-2026-2952/ (Markdown: https://insights.sbomify.com/CVE-2026-2952/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-2952
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-2952
- OSV: https://osv.dev/vulnerability/CVE-2026-2952

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-2952/
Summaries are generated and may contain mistakes; the official description above is the record.