CVE-2026-27590
Caddy pre-2.11.1 path handling may mis-map SCRIPT_NAME, causing PHP execution of non-PHP files
Is CVE-2026-27590 being exploited?
Not confirmed. CVE-2026-27590 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 0.54% probability of exploitation in the next 30 days.
How severe is CVE-2026-27590?
CVE-2026-27590 is rated High. 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-2026-27590?
Yes. A fix has been recorded for CVE-2026-27590. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-27590 affect?
CVE-2026-27590 affects Caddy Server (pre-2.11.1). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-27590?
Upgrade to 2.11.1+; verify uploads; review path handling
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Path handling flaw may map to wrong PHP file, enabling unintended PHP execution and possible RCE if uploads are allowed
Patch when possible
- affected< 2.11.1
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.