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

> Unauthenticated attackers can access the full browsing history of all gallery visitors via the pwg.history.search API.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 3 Apr 2026
- **Updated:** 6 Apr 2026
- **Also known as:** GHSA-397m-gfhm-pmg2

## 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 (Missing Authorization)

## Which versions are affected by CVE-2026-27833?

It affects 1 product.


Products: 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.

## 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:

- Piwigo < 16.3.0 - Unauthenticated Information Disclosure via History API (nuclei): http/cves/2026/CVE-2026-27833.yaml

## Other vulnerabilities in Piwigo Piwigo

- [CVE-2014-4648](https://insights.sbomify.com/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](https://insights.sbomify.com/CVE-2023-33361/): SQL injection in n/a (critical 9.8)
- [CVE-2023-33362](https://insights.sbomify.com/CVE-2023-33362/): SQL injection in n/a (critical 9.8)
- [CVE-2020-19213](https://insights.sbomify.com/CVE-2020-19213/): SQL injection in n/a (critical 9.8)
- [CVE-2021-32615](https://insights.sbomify.com/CVE-2021-32615/): SQL injection in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-27833 and fix it if it is affected.

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

Affected product: Piwigo Piwigo. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-27833/ (Markdown: https://insights.sbomify.com/CVE-2026-27833/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-27833
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-27833
- OSV: https://osv.dev/vulnerability/CVE-2026-27833

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-27833/
Summaries are generated and may contain mistakes; the official description above is the record.