Unauthenticated SQL Injection Vulnerability in SPIP Referer Spam Plugin
CVE-2026-27743

9.3CRITICAL

Key Information:

Vendor

Spip

Status
Referer Spam
Vendor
CVE Published:
25 February 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-27743?

The SPIP Referer Spam plugin, specifically versions prior to 1.3.0, is susceptible to an unauthenticated SQL injection vulnerability. This arises from the 'referer_spam_ajouter' and 'referer_spam_supprimer' action handlers, which directly incorporate user-supplied data from the URL parameter into SQL LIKE clauses without adequate input validation or parameterization. The lack of authorization checks and absence of SPIP's action protection mechanisms, such as securiser_action(), enable remote attackers to initiate arbitrary SQL queries, potentially compromising the integrity and security of the database.

Affected Version(s)

referer_spam 0 < 1.3.0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-27743 - Proof of Concept

References

https://chocapikk.com/posts/2026/spip-plugins-vulnerabili...
technical-descriptionexploit
https://blog.spip.net/Mise-a-jour-de-securite-sortie-de-S...
vendor-advisory
https://plugins.spip.net/referer_spam.html
product

CVSS V4

Score:
9.3
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Valentin Lobstein (Chocapikk)
VulnCheck
.