CVE-2009-4855
CWE-89Published: May 11, 2010· Updated: Jun 16, 2026
Official Description
SQL injection vulnerability in index.php in TYPO3 4.0 allows remote attackers to execute arbitrary SQL commands via the showUid parameter. NOTE: the TYPO3 Security Team disputes this report, stating that "there is no such vulnerability... The showUid parameter is generally used in third-party TYPO3 extensions - not in TYPO3 Core.
Technical Analysis
CVE-2009-4855 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
A proof-of-concept (PoC) exploit exists for CVE-2009-4855. While not yet confirmed in active campaigns, the availability of PoC code increases exploitation risk substantially.
From a weakness classification perspective (CWE-89): SQL injection vulnerabilities allow attackers to manipulate database queries, potentially exposing or modifying sensitive data.
CVSS v3.1 Vector Breakdown
Affected Vendors & Products
Exploit & PoC Resources
All References (8)
Quick Facts
Related CVEs (CWE-89)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2009-4855 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts