---
id: "CVE-2026-115541"
kind: "vulnerability"
aliases: ["CVE-2026-115541"]
title: "HumHub: stored XSS in friendship dialog via first/last name, fixed in 1.18.7 and 1.19.1"
severity: "high"
cvss: 7.2
epss: null
exploited: false
status: "open"
category: "package"
products: [{"name": "humhub", "fixed": ["1.18.7", "1.19.1"], "affected": "< 1.18.7, >= 1.19.0, < 1.19.1", "ecosystem": "packagist"}]
ecosystems: []
tags: ["humhub", "package", "php", "self-hosted"]
not_affected_if: ["different-version", "friendships-disabled", "no-public-registration", "patched-version", "username-display-name"]
published_at: "2026-11-03T22:19:17+00:00"
first_seen_at: "2026-11-03T23:15:08+00:00"
updated_at: "2026-11-03T23:17:06+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-115541", "first_seen_at": "2026-11-03T23:15:08+00:00"}, {"source": "analyst", "url": null, "first_seen_at": "2026-11-03T23:17:06+00:00"}]
---

# HumHub: stored XSS in friendship dialog via first/last name, fixed in 1.18.7 and 1.19.1

HumHub Community Edition 1.19.0 lets a logged-in member save HTML in their first and last name. When another logged-in user clicks Friends on that profile, the name is inserted as markup into the confirmation dialog, so the script runs in the victim's HumHub session.

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

## Affected

- packagist:humhub affected < 1.18.7, >= 1.19.0, < 1.19.1 fixed 1.18.7, 1.19.1

## How to check

- Check the HumHub version (php protected/yii humhub/about or the admin About page). Exposed if below 1.18.7, or exactly 1.19.0.
- Check Administration > Settings > General: 'Enable user friendship system' on, and Administration > Settings > Appearance: display name format using first and last name. If friendships are off or the format is username, the flaw is not reachable.
- Review existing first and last names for HTML markup such as <script> or <img onerror=...>.

## Fix

Upgrade to HumHub 1.18.7 (1.18 line) or 1.19.1 or later (1.19 line). Workaround: disable 'Enable user friendship system' under Administration > Settings > General, or set the display name format to username under Administration > Settings > Appearance.

## Timeline

- 2026-11-03T23:15:08+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-115541
- 2026-11-03T23:17:06+00:00 analyst — Read GHSA-ph8x-wg86-qp2m: fixed 1.18.7 and 1.19.1 (1.19.3 release also linked, later). Affected is <1.18.7 and 1.19.0 only, not just 1.19.0; needs friendships enabled and display name built from first+last name. Workarounds from advisory. Lower bound of 1.18 line not stated.

## Documents

- [advisory] Vendor advisory: github.com https://github.com/humhub/humhub/security/advisories/GHSA-ph8x-wg86-qp2m
- [fix] Release notes: github.com https://github.com/humhub/humhub/releases/tag/v1.18.7
- [fix] Release notes: github.com https://github.com/humhub/humhub/releases/tag/v1.19.3

## From the sources

HumHub Community Edition 1.19.0 contains a stored cross-site scripting vulnerability in the friendship confirmation dialog. An authenticated low-privileged member can save HTML in their first and last name. When another authenticated user clicks Friends for that profile, HumHub places the decoded display name into a modal through jQuery html(), causing attacker-controlled markup to execute in the victim's HumHub origin.

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