# CVE-2026-56705: Adminer before 5.4.3 Remote Code Execution via MSSQL PDO DSN Injection

> Unauthenticated attackers can inject ODBC parameters to write PHP code to the web root, achieving remote code execution in Adminer.

- **Severity:** Critical 9.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 25 Aug 2026
- **Updated:** 25 Aug 2026
- **Also known as:** DEBIAN-CVE-2026-56705, GHSA-34q8-53jm-qc2r, GHSA-r4x9-5m63-3vxw, UBUNTU-CVE-2026-56705

## What is CVE-2026-56705?

CVE-2026-56705 is a critical code injection vulnerability in vrana adminer, published on 25 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Adminer before 5.4.3 fails to sanitize the server field before constructing a PDO DSN string, allowing unauthenticated attackers to inject ODBC parameters via semicolons. Attackers can inject TraceFile and TraceOn parameters to write PHP code to the web root, achieving remote code execution when the trace file is accessed.

Weakness: CWE-73 (External Control of File Name or Path)

## Which versions are affected by CVE-2026-56705?


## How do I fix CVE-2026-56705?

Upgrade to a fixed version.

## Is CVE-2026-56705 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-56705 exists.

Public exploit code:

- CVE-2026-56705 - Adminer < 5.4.3 unauthenticated RCE via MSSQL PDO DSN injection (ODBC TraceFile arbitrary file write). PoC, Docker lab and negative test included. (github_poc): https://github.com/Boreas37/CVE-2026-56705
- CVE-2026-56705 — Adminer < 5.4.3 Unauthenticated RCE via MSSQL PDO DSN Injection (github_poc): https://github.com/ChiefYoru/Exploit-CVE-2026-56705

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-56705 and fix it if it is affected.

What it is: CVE-2026-56705 is a critical code injection vulnerability in vrana adminer, published on 25 Aug 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-2026-56705 exists.

Affected product: vrana adminer. 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-2026-56705/ (Markdown: https://insights.sbomify.com/CVE-2026-56705/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-56705
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-56705
- OSV: https://osv.dev/vulnerability/CVE-2026-56705

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-56705/
Summaries are generated and may contain mistakes; the official description above is the record.