Cross Site Scripting Vulnerability in Piwigo Public Authentication Page
CVE-2026-78187

2.3LOW

Key Information:

Vendor

Piwigo

Status
Piwigo
Vendor
CVE Published:
24 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-78187?

A vulnerability has been identified in Piwigo 16.3.0 that affects the Public Authentication Page component, allowing attackers to exploit an unknown function via manipulation of the lang parameter. This can lead to cross site scripting (XSS), where malicious scripts can be executed in the user's browser. The attack can be carried out remotely, although it presents a high level of complexity for exploitation. It is crucial for users of Piwigo to upgrade to version 16.4.0 to mitigate this vulnerability effectively. The patch version is identified with the commit hash 5277a7dee4b8f1a174f1d69e1e2a4e1c82a3fc9e.

Affected Version(s)

Piwigo 16.3.0

Piwigo 16.4.0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-78187 - Proof of Concept

References

https://vuldb.com/vuln/394569
vdb-entrytechnical-description
https://vuldb.com/vuln/394569/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-78187
third-party-advisory

CVSS V4

Score:
2.3
Severity:
LOW
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Leousum (VulDB User)
.