---
id: "CVE-2026-111887"
kind: "vulnerability"
aliases: ["CVE-2026-111887"]
title: "phpMyFAQ: comment endpoint leaks which display names and emails are registered"
severity: "medium"
cvss: 6.9
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["faq-sites", "php", "phpmyfaq", "runtime", "self-hosted"]
not_affected_if: ["guest-comments-disabled", "patched-version"]
published_at: "2026-10-17T19:16:29+00:00"
first_seen_at: "2026-10-23T21:57:14+00:00"
updated_at: "2026-10-25T03:42:18+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-111887", "first_seen_at": "2026-10-23T21:57:14+00:00"}]
---

# phpMyFAQ: comment endpoint leaks which display names and emails are registered

phpMyFAQ before 4.1.9 and 4.2.0-beta returns a distinct HTTP 409 response when a guest comment uses an existing user name or email. An unauthenticated attacker can use this to confirm registered accounts and pair names with emails for targeted phishing.

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

## How to check

- Check the installed phpMyFAQ version in the admin panel or the `VERSION` file in the install directory, and compare it with `4.1.9` and `4.2.0-beta`
- Submit a guest comment with a known registered name and email on a test copy and confirm whether the response is HTTP 409

## Fix

- Upgrade phpMyFAQ to `4.1.9` or later on the 4.1 line, or to `4.2.0-beta` or later on the 4.2 line

## Timeline

- 2026-10-23T21:57:14+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-111887

## From the sources

phpMyFAQ before 4.1.9 and 4.2.0-alpha before 4.2.0-beta contains an account enumeration vulnerability that allows unauthenticated attackers to confirm registered display names and emails via a distinct HTTP 409 response. Attackers can submit guest comments to the comment create endpoint with candidate user and mail values to link names to emails for targeted phishing.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_