CVE-2026-55573 Details
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.
A remote code execution vulnerability has been identified in e107, a content management system, in versions prior to 2.3.7. The issue arises in the install.php file, where the previous_steps POST parameter, controlled by the attacker, is decoded and passed to the unserialize() function without any restrictions on allowed classes. This vulnerability is exploitable by an unauthenticated attacker who can access install.php, leading to arbitrary execution of PHP functions with the privileges of the web server process, and potentially allowing for a complete compromise of the server.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Oct 14, 2026CISA-ADP
Assessed Oct 15, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/e107inc/e107/security/advisories/GHSA-c8h6-wpj3-4cr8 | CISA-ADP | AdvisoryRemedyVendor |
| https://github.com/e107inc/e107/commit/5d6d649e8cf01854d6024d07997c2449fdd75f24 | [email protected] | Source CodeVendor |
| https://github.com/e107inc/e107/commit/6c404295213952aedb9b3689be19dd4c7ba550b0 | [email protected] | Source CodeVendor |
| https://github.com/e107inc/e107/releases/tag/v2.3.7 | [email protected] | Release NotesVendor |
| https://github.com/e107inc/e107/security/advisories/GHSA-c8h6-wpj3-4cr8 | [email protected] | AdvisoryRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-502 | Deserialization of Untrusted Data | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| e107 | <= 2.3.6 (semver) |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Oct 15, 2026 | CVE Modified | CISA-ADP |
| Oct 14, 2026 | New CVE Received | [email protected] |