CVE-2026-27833
HighPublic exploitPiwigo: Unauthenticated Information Disclosure via pwg.history.search API
Published Apr 3, 2026 · Updated Aug 12, 2026 · Also known as GHSA-397m-gfhm-pmg2
Key Facts
Patch immediately- CVE-2026-27833 is a high-severity vulnerability (CVSS 7.5 v3.1) affecting Piwigo.
- It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
- EPSS estimates a 1.7% probability of exploitation in the next 30 days.
- Fixed versions are available, including Piwigo 16.3.0.
- Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
CVSS v3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS (30-day exploit likelihood)
1.7%
Higher than 76.8% of all scored CVEs
Exploited in the wild
No known
Not in a known-exploited catalog
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2026-27833 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
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
2 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| PiwigoPiwigo | >= < 16.3.0 | 16.3.0 |
Patched Releases
Piwigo
16.3.0
Timeline
Publicly disclosed
Apr 3, 2026
Last updated
Aug 12, 2026
Weakness Type
- CWE-862 Missing Authorization
References
- advisoryhttps://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27833.json
- advisoryhttps://nvd.nist.gov/vuln/detail/CVE-2026-27833
- otherhttps://github.com/Piwigo/Piwigo/commit/d05c16561ce3692ca922199f8c8d7b1a45893f1c
- otherhttps://github.com/Piwigo/Piwigo/security/advisories/GHSA-397m-gfhm-pmg2
- otherhttps://piwigo.org/release-16.3.0
FAQ
Common Questions.
Piwigo is an open source photo gallery application for the web.
Affected: Piwigo versions >= < 16.3.0. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including Piwigo 16.3.0.
Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
Is CVE-2026-27833 Running On Your Attack Surface?
Brandefense maps vulnerabilities like this one to your internet-facing assets and tells you exactly where to patch.
Request A Demo