What is CVE-2026-77647?

CVE-2026-77647 is a critical-severity vulnerability in Spip, classified under Code Injection. CVSS score: 9.8/10. Published 2026-08-20.

How severe is CVE-2026-77647?

Critical severity. CVSS v3 base score is 9.8 out of 10.

RCE in Spip

CVE-2026-77647

SPIP before 4.4.20 allows unauthenticated remote attackers to execute arbitrary code, as exploited in the wild in August 2026. This is related to incorrect identification of <?php blocks, and var_export's mishandling of certain cases such as presence of a '<' character.

Vulnerability class: RCE (Remote Code Execution)

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Spip

Weakness classification (CWE)

CWE-94 — Code Injection

References

cve@mitre.org (vendor-advisory)
cve@mitre.org (third-party-advisory)

Frequently asked questions

What is CVE-2026-77647?: CVE-2026-77647 is a critical-severity vulnerability in Spip, classified under Code Injection. CVSS score: 9.8/10. Published 2026-08-20.
How severe is CVE-2026-77647?: Critical severity. CVSS v3 base score is 9.8 out of 10.