CVE-2026-59856
Vim PHP omni-complete flaw allows OS command execution via crafted PHP files.
Is CVE-2026-59856 being exploited?
Not confirmed. CVE-2026-59856 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 0.22% probability of exploitation in the next 30 days.
How severe is CVE-2026-59856?
CVE-2026-59856 is rated High with a CVSS score of 8.4. 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-2026-59856?
Yes. A fix has been recorded for CVE-2026-59856. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-59856 affect?
CVE-2026-59856 affects Vim < 9.2.0736, runtime/autoload/phpcomplete.vim, Users invoking omni-completion on PHP files. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-59856?
Upgrade to Vim >= 9.2.0736 or disable phpcomplete.vim; avoid omni-completion on untrusted PHP files.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Arbitrary OS command execution when a user opens a crafted PHP file and triggers omni-completion; commands run with the user's privileges.
Immediate action required
- affected< 9.2.0736
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.