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)
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.023 (82.6th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 83rd percentile — 82.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.026 · newest: 0.023 · change: -0.003
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- blog.spip.net/Mise-a-jour-critique-de-securite-sortie-de-SPIP-4-4-20.html (vendor-advisory)
- lists.debian.org/debian-security-announce/2026/msg00359.html (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.
- Is CVE-2026-77647 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.