CVE-2026-55573: CWE-502: Deserialization of Untrusted Data in e107inc e107
Description
e107 is a content management system (CMS). Prior to 2.3.7, install.php decodes the attacker-controlled previous_steps POST parameter and passes it to unserialize() at file scope and again in the e_install constructor without restricting allowed classes. The installer remains accessible after a normal installation, and a crafted object graph using the bundled GuzzleHttp\Psr7\PumpStream class can flow through paths.hash into site_path, where string coercion invokes an attacker-controlled callable. An unauthenticated attacker who can reach install.php can therefore execute arbitrary PHP functions with the web server process's privileges, leading to full server compromise. This issue is fixed in version 2.3.7.
CVSS v3.1
Score 9.8critical
Affected software
e107inc
e107
Weaknesses
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-16T23:11:20.214Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6acfc7ff2cdf04f6569f5ec7
Added to database: 10/14/2026, 18:20:47 UTC
Last updated: 10/14/2026, 18:20:47 UTC
Views: 1
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