CVE-2026-28783
Craft CMS RCE via Twig function bypass; requires admin or compromised access
Is CVE-2026-28783 being exploited?
Not confirmed. CVE-2026-28783 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 0.46% probability of exploitation in the next 30 days.
How severe is CVE-2026-28783?
CVE-2026-28783 is rated Critical with a CVSS score of 9.4. 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-2026-28783?
Yes. A fix has been recorded for CVE-2026-28783. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-28783 affect?
CVE-2026-28783 affects Craft CMS <5.9.0-beta.1, Craft CMS <4.17.0-beta.1. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-28783?
Upgrade to 5.9.0-beta.1 or 4.17.0-beta.1; tighten admin access
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
RCE, arbitrary file reads, SSRF, SSTI via Twig non-Closure arrow bypass; requires admin or System Messages access
Immediate action required
- affected>= 5.0.0-RC1 and <= 5.9.0-beta.1
- affected>= 4.0.0-RC1 and <= 4.17.0-beta.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.