---
id: "CVE-2026-123857"
page: "https://infrastack.ai/live/CVE-2026-123857"
kind: "vulnerability"
aliases: ["CVE-2026-123857"]
title: "JetBrains PhpStorm: untrusted projects can trigger XXE via PHPMD"
severity: "medium"
cvss: 4.3
epss: null
exploited: false
status: "open"
category: "other"
products: []
ecosystems: []
tags: ["jetbrains", "other", "php", "phpstorm"]
not_affected_if: ["phpstorm-2026.3-or-later", "trusted-projects-only"]
published_at: "2026-11-06T17:17:25+00:00"
first_seen_at: "2026-11-06T17:43:13+00:00"
updated_at: "2026-11-06T17:45:37+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-123857", "first_seen_at": "2026-11-06T17:43:13+00:00"}]
exploit_sources: []
---

# JetBrains PhpStorm: untrusted projects can trigger XXE via PHPMD

Link for people: https://infrastack.ai/live/CVE-2026-123857 (this .md is for agents)

In JetBrains PhpStorm before 2026.3, opening an untrusted project could trigger XML External Entity processing through PHPMD ruleset autodetection. An attacker who supplies a malicious project may be able to read local files or reach internal resources.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed PhpStorm version under Help > About
- Look for PhpStorm builds older than `2026.3`

## Fix

- JetBrains PhpStorm: move to `2026.3` or later

## Timeline

- 2026-11-06T17:43:13+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-123857

## From the sources

In JetBrains PhpStorm before 2026.3 xXE was possible in untrusted projects via PHPMD ruleset autodetection

---

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