---
id: CVE-2026-78187
title: A vulnerability has been found in Piwigo 16.3.0
summary: >-
  A vulnerability has been found in Piwigo 16.3.0. This impacts an unknown
  function of the component Public Authentication Page. Such manipulation of the
  argument lang leads to cross site scripting. The attack may be performed from
  remote.…
severity: low
cvss: 3.1
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N'
cwe:
  - CWE-79
  - CWE-94
published: '2026-08-24'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T13:10:00.187'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-78187'
references:
  - url: >-
      https://github.com/Leousum/VulnPoC/blob/main/Piwigo%2016.3.0/reflected_XSS.md
    label: cna@vuldb.com
  - url: 'https://github.com/Piwigo/Piwigo/'
    label: cna@vuldb.com
  - url: >-
      https://github.com/Piwigo/Piwigo/commit/5277a7dee4b8f1a174f1d69e1e2a4e1c82a3fc9e
    label: cna@vuldb.com
  - url: 'https://github.com/Piwigo/Piwigo/releases/tag/16.4.0'
    label: cna@vuldb.com
  - url: 'https://github.com/Piwigo/Piwigo/security/advisories/GHSA-rr39-mf4j-6594'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/cve/CVE-2026-78187'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/submit/885228'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/394569'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/394569/cti'
    label: cna@vuldb.com
tags:
  - nvd
epss: 0.00657
epssPercentile: 0.50109
ingestedAt: '2026-10-14T13:30:58.555Z'
---

## Overview

A vulnerability has been found in Piwigo 16.3.0. This impacts an unknown function of the component Public Authentication Page. Such manipulation of the argument lang leads to cross site scripting. The attack may be performed from remote. A high complexity level is associated with this attack. The exploitability is said to be difficult. The exploit has been disclosed to the public and may be used. Upgrading to version 16.4.0 will fix this issue. The name of the patch is 5277a7dee4b8f1a174f1d69e1e2a4e1c82a3fc9e. It is recommended to upgrade the affected component.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.