CVE-2026-77647
Unauthenticated RCE in SPIP <4.4.20 via PHP tag misidentification
Is CVE-2026-77647 being exploited?
Not confirmed. CVE-2026-77647 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 2.6% probability of exploitation in the next 30 days.
How severe is CVE-2026-77647?
CVE-2026-77647 is rated Critical with a CVSS score of 9.8. 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-2026-77647?
Yes. A fix has been recorded for CVE-2026-77647. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-77647 affect?
CVE-2026-77647 affects SPIP CMS versions <4.4.20, Websites using SPIP, PHP hosting environments serving SPIP. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-77647?
Upgrade to SPIP 4.4.20+, apply WAF rules, isolate compromised hosts
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated remote code execution via crafted content; attackers can run arbitrary PHP, gain host control, persist, and exfiltrate data.
Immediate action required
- affected< 4.4.20
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.