CVE-2026-55794
Authenticated RCE in Craft CMS via Referer header during entry save (pre-5.10.0).
Is CVE-2026-55794 being exploited?
Not confirmed. CVE-2026-55794 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 0.41% probability of exploitation in the next 30 days.
How severe is CVE-2026-55794?
CVE-2026-55794 is rated High with a CVSS score of 8.7. 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-2026-55794?
Yes. A fix has been recorded for CVE-2026-55794. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-55794 affect?
CVE-2026-55794 affects Craft CMS <=5.9.x (pre-5.10.0). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-55794?
Upgrade to 5.10.0+ to fix RCE
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated RCE via crafted Referer header; editor-level access can execute code on server.
Patch when possible
- affected>= 5.9.0 and < 5.10.0
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.