CVE-2026-77136
Unauthenticated Fluid template injection in TYPO3 Powermail enabling RCE
Is CVE-2026-77136 being exploited?
Not confirmed. CVE-2026-77136 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 0.55% probability of exploitation in the next 30 days.
How severe is CVE-2026-77136?
CVE-2026-77136 is rated Critical with a CVSS score of 9.5. 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-2026-77136?
Yes. A fix has been recorded for CVE-2026-77136. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-77136 affect?
CVE-2026-77136 affects TYPO3 Powermail extension, TYPO3 CMS using Fluid templates. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-77136?
Apply vendor patch ASAP or disable/reset sender_name field; restrict anonymous form submissions.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated template injection via Powermail sender_name can disclose config/env/source and allow remote code execution via Fluid ViewHelpers.
Immediate action required
- affected>= 13.0.0 and < 13.2.1
- affected>= 11.0.0 and < 12.6.1
- affected< 10.9.3
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.