CRITICAL 9.8 NVD
CVE-2026-55573
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 unserializ
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.
References
- https://github.com/e107inc/e107/commit/5d6d649e8cf01854d6024d07997c2449fdd75f24
- https://github.com/e107inc/e107/commit/6c404295213952aedb9b3689be19dd4c7ba550b0
- https://github.com/e107inc/e107/releases/tag/v2.3.7
- https://github.com/e107inc/e107/security/advisories/GHSA-c8h6-wpj3-4cr8
This critical severity vulnerability with a CVSS score of 9.8 was published on 2026-10-14 via NVD.
Risk Timeline
CVE Disclosed2026-10-14 · -1 days ago
Remediation Resources
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