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

What is CVE-2026-27833?

CVE-2026-27833 is a high-severity missing authorization vulnerability in Piwigo Piwigo, published on 3 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-862

Which versions are affected by CVE-2026-27833?

It affects 1 product.

Products include Piwigo Piwigo.

How do I fix CVE-2026-27833?

No fix has been published for CVE-2026-27833 yet. Limit exposure of the affected software until one is available.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2026-27833 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-27833 exists.

Public exploit code: 1 Nuclei template.

Other vulnerabilities in Piwigo Piwigo

• CVE-2014-4648 Unspecified vulnerability in Piwigo before 2.6.3 has unknown impact and attack vectors, related to a "security failure." Critical 10.0
• CVE-2023-33361 SQL injection in n/a Critical 9.8
• CVE-2023-33362 SQL injection in n/a Critical 9.8
• CVE-2020-19213 SQL injection in n/a Critical 9.8
• CVE-2021-32615 SQL injection in n/a Critical 9.8

All Piwigo Piwigo vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-397m-gfhm-pmg2.