Auth bypass in Piwigo
CVE-2026-27833
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.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.017 (76.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 76th percentile — 76.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.016 · newest: 0.017 · change: +0.001
Affected products
- Piwigo — versions < 16.3.0
Weakness classification (CWE)
References
- github.com/Piwigo/Piwigo/security/advisories/GHSA-397m-gfhm-pmg2 (Exploit, Vendor Advisory)
- github.com/Piwigo/Piwigo/commit/d05c16561ce3692ca922199f8c8d7b1a45893f1c (Patch)
- piwigo.org/release-16.3.0 (Release Notes)
Frequently asked questions
- What is CVE-2026-27833?
- CVE-2026-27833 is a high-severity vulnerability in Piwigo, classified under Missing Authorization. CVSS score: 7.5/10. Published 2026-04-03.
- How severe is CVE-2026-27833?
- High severity. CVSS v3 base score is 7.5 out of 10.