CVE-2026-27833: Piwigo: Unauthenticated Information Disclosure via pwg.history.search API

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.6% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-04-03 · updated 2026-07-24
Weakness: CWE-862

Description

Piwigo is an open source photo gallery application for the web. Prior to version 16.3.0, the pwg.history.search API method in Piwigo is registered without the admin_only option, allowing unauthenticated users to access the full browsing history of all gallery visitors. This issue has been patched in version 16.3.0.

Affected products

Piwigo: before 16.3.0 — fixed in 16.3.0

How to fix

Upgrade to a fixed version: Piwigo 16.3.0. Check the vendor advisory for mitigations.

References

https://github.com/Piwigo/Piwigo/commit/d05c16561ce3692ca922199f8c8d7b1a45893f1c
https://github.com/Piwigo/Piwigo/security/advisories/GHSA-397m-gfhm-pmg2
https://piwigo.org/release-16.3.0

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