CVE-2026-56703
Authenticated RCE in Adminer via SQLite VACUUM INTO writing PHP to disk.
Is CVE-2026-56703 being exploited?
Not confirmed. CVE-2026-56703 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 1.1% probability of exploitation in the next 30 days.
How severe is CVE-2026-56703?
CVE-2026-56703 is rated High with a CVSS score of 8.6. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-56703?
Yes. A fix has been recorded for CVE-2026-56703. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-56703 affect?
CVE-2026-56703 affects Adminer < 5.4.3, PHP web servers using SQLite, Shared hosting with Adminer installed. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-56703?
Upgrade Adminer to 5.4.3+, restrict access, rotate creds, scan for web shells
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated attackers can write PHP payloads via VACUUM INTO and achieve remote code execution as the web server user, enabling full server compromise.
Immediate action required
- affected< 5.4.3
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.