Description
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.
References9
- github.com/Leousum/VulnPoC/blob/main/Piwigo%2016.3.0/reflected_…
- github.com/Piwigo/Piwigo/
- github.com/Piwigo/Piwigo/commit/5277a7dee4b8f1a174f1d69e1e2a4e1…
- github.com/Piwigo/Piwigo/releases/tag/16.4.0
- github.com/Piwigo/Piwigo/security/advisories/GHSA-rr39-mf4j-6594
- vuldb.com/cve/CVE-2026-78187
- vuldb.com/submit/885228
- vuldb.com/vuln/394569
- vuldb.com/vuln/394569/cti
Metrics
- CVSS 3.1
-
3.1
LOW
Score source: CNA
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N - CVSS 4.0
-
1.3
LOW
Score source: CNA
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - EPSS — exploit probability
- 1% percentile: 52 · as of 9 November 2026
- CWE
- CWE-79CWE-94
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.