CVE-2026-79774
Authenticated backend users can bypass Twig sandbox to RCE and DB manipulation in Winter CMS
Is CVE-2026-79774 being exploited?
Not confirmed. CVE-2026-79774 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 0.43% probability of exploitation in the next 30 days.
How severe is CVE-2026-79774?
CVE-2026-79774 is rated Critical with a CVSS score of 9.3. 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-2026-79774?
Yes. A fix has been recorded for CVE-2026-79774. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-79774 affect?
CVE-2026-79774 affects Winter CMS < 1.2.13, System\\Twig\\SecurityPolicy (Twig sandbox). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-79774?
Upgrade to Winter CMS 1.2.13+, restrict template-edit privileges, audit templates
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated backend users with template-edit permissions can bypass Twig sandbox to read/modify DB, execute arbitrary SQL, and achieve remote code execution via PHP template injection.
Immediate action required
- affected>= 1.2.7 and < 1.2.13
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.