e107: Unsafe deserialization in install.php allows unauthenticated RCE via POP chain

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-55573
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-14 18:17:38 UTC
Updated2026-10-16 20:04:29 UTC
Descriptione107 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.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.005950000 probability, percentile 0.473030000 (date 2026-10-16)

Problem Types: CWE-502 | CWE-502 CWE-502: Deserialization of Untrusted Data

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA E107inc E107 affected < 2.3.7 Not specified

References

ReferenceSourceLinkTags
github.com/e107inc/e107/commit/5d6d649e8cf01854d6024d07997c2449fdd75f24 [email protected] github.com
github.com/e107inc/e107/releases/tag/v2.3.7 [email protected] github.com
github.com/e107inc/e107/commit/6c404295213952aedb9b3689be19dd4c7ba550b0 [email protected] github.com
github.com/e107inc/e107/security/advisories/GHSA-c8h6-wpj3-4cr8 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
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