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CVE-2026-78187

Piwigo Public Authentication cross site scripting

LOW
3.1
CVSS Score
Published: August 24, 2026 at 04:30 AM UTC
Updated: October 14, 2026 at 01:10 PM UTC
1 product affected across 1 vendorPiwigo

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Severity
LOW3.1
Exploit prediction
EPSS 0.7%
SSVC
PoC

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Piwigo· Piwigo
95%
All versions16.3.0
Vendor states this is fixed in 16.4.0 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (9)

VDB EntryTechnical Description
Source: cverecord
https://vuldb.com/vuln/394569
SignaturePermissions Required
Source: cverecord
https://vuldb.com/vuln/394569/cti
Third Party Advisory
Source: cverecord
https://vuldb.com/cve/CVE-2026-78187
Third Party Advisory
Source: cverecord
https://vuldb.com/submit/885228
Related
Source: cverecord
https://github.com/Piwigo/Piwigo/security/advisories/GHSA-rr39-mf4j-6594
Exploit
Source: cverecord
https://github.com/Leousum/VulnPoC/blob/main/Piwigo%2016.3.0/reflected_XSS.md
Patch
Source: cverecord
https://github.com/Piwigo/Piwigo/commit/5277a7dee4b8f1a174f1d69e1e2a4e1c82a3fc9e
Patch
Source: cverecord
https://github.com/Piwigo/Piwigo/releases/tag/16.4.0

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

3.1LOWVulDB
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-79CWE-94

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