# EGroupware has a Remote Code Execution Vulnerability

Advisory record · `GHSA-h9qx-v5xp-ph8p`

- **Identifiers:** `GHSA-h9qx-v5xp-ph8p` · `CVE-2026-27823` · `PKSA-3pf5-qtx8-njsg`
- **State:** Confirmed
- **Severity:** CVSS 8.7 High
- **Critical:** No
- **Weakness (CWE):** [CWE-22](https://cwe.mitre.org/data/definitions/22.html) · [CWE-94](https://cwe.mitre.org/data/definitions/94.html) · [CWE-285](https://cwe.mitre.org/data/definitions/285.html) · [CWE-639](https://cwe.mitre.org/data/definitions/639.html)
- **Tags:** [Path traversal](https://agentprime.io/advisories/tag/path-traversal.md) · [Code injection](https://agentprime.io/advisories/tag/code-injection.md) · [Broken access control](https://agentprime.io/advisories/tag/access-control.md)
- **Published:** 7 Jul 2026
- **Updated:** 10 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 7 Jul 2026, 13:01 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `egroupware/egroupware` (Packagist): affected `>=26.0.20251208, <26.2.20260224 || <23.1.20260224`; fixed in `26.2.20260224`, `23.1.20260224`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> EGroupware, as published under the Packagist package egroupware/egroupware, is vulnerable in versions before 23.1.20260224 and from 26.0.20251208 before 26.2.20260224. An authenticated attacker can exploit a flaw in the course-teacher authorization check of an upload handler, combined with a file write and an arbitrary file read, to run commands on the server; if user self-registration is enabled, the source says no prior authentication may be needed. Upgrade to 23.1.20260224 or 26.2.20260224, which are the fixed versions listed.

Written 31 Oct 2026.

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 8.7 High, CVSS 4.0: `CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0097, the 62nd percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:00 UTC: First seen by agentprime
- 31 Oct 2026, 14:00 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-h9qx-v5xp-ph8p)

## Sources

- [GitHub Advisory Database: GHSA-h9qx-v5xp-ph8p](https://github.com/advisories/GHSA-h9qx-v5xp-ph8p)
- [OSV: GHSA-h9qx-v5xp-ph8p](https://osv.dev/vulnerability/GHSA-h9qx-v5xp-ph8p)
- <https://github.com/EGroupware/egroupware/security/advisories/GHSA-h9qx-v5xp-ph8p>
- <https://github.com/EGroupware/egroupware>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-h9qx-v5xp-ph8p>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

---

The web page: <https://agentprime.io/advisories/GHSA-h9qx-v5xp-ph8p/>. Everything for agents: <https://agentprime.io/llms.txt>.