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CVE-2026-55573

9.8 · CRITICAL

e107 is a content management system (CMS).

Published Oct 14, 2026CWE-502EPSS 0.70%

Overview

CVE-2026-55573 is a critical-severity vulnerability. It was published on October 14, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/e107inc/e107/commit/5d6d649e8cf01854d6024d07997c2449fdd75f24GitHubgithub.com/e107inc/e107/commit/6c404295213952aedb9b3689be19dd4c7ba550b0GitHubgithub.com/e107inc/e107/releases/tag/v2.3.7GitHubgithub.com/e107inc/e107/security/advisories/GHSA-c8h6-wpj3-4cr8GitHubgithub.com/e107inc/e107/security/advisories/GHSA-c8h6-wpj3-4cr8

How CyberStrike helps

Frequently asked questions

What is CVE-2026-55573?

CVE-2026-55573 is a critical-severity vulnerability. It was published on October 14, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-55573?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-55573?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-55573?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-55573 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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