CVE-2026-27760
Unauthenticated PHP code execution in OpenCATS installer.
Is CVE-2026-27760 being exploited?
Not confirmed. CVE-2026-27760 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 35% probability of exploitation in the next 30 days.
How severe is CVE-2026-27760?
CVE-2026-27760 is rated Critical with a CVSS score of 9.2. 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-2026-27760?
Yes. A fix has been recorded for CVE-2026-27760. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-27760 affect?
CVE-2026-27760 affects OpenCATS (pre-commit 3002a29). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-27760?
Upgrade to OpenCATS 3002a29+ immediately
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution via installer AJAX endpoint; injected PHP persists on page loads when setup wizard incomplete.
Patch when possible
- affected<= 0.9.7.4
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.