CVE-2026-55573: critical vulnerability in e107inc e107
e107: Unsafe deserialization in install.php allows unauthenticated RCE via POP chain
Published · Updated
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28Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 9.8epss 0.7%
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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products
e107inc · e107Related CVEs — e107inc e107
In the same product, most dangerous first.
CVE-2026-48997HIGHe107: Command Injection via shell expansion in ImageMagick resize destination pathEPSS 0.9%CVE-2026-55572CRITICALe107: SQL injection in alt_auth plugin (otherdb / e107db backends) via login usernameEPSS 0.5%CVE-2026-57859HIGHe107 Second-Order Code Execution via eval()-Based Deserialization in e_array::unserialize()EPSS 0.5%CVE-2026-43935HIGHe107: Host Header Injection in e107 password reset enables phishingEPSS 0.3%CVE-2026-114407MEDIUMe107 CMS before 2.3.13 Reflected XSS via search.php author ParameterEPSS 0.3%CVE-2026-43936MEDIUMe107: Server-Side Request Forgery (SSRF) in the remote file fetcherEPSS 0.2%