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e107 CMS EUVDEUVD-2026-51123

| CVE-2026-57859 HIGH
Deserialization of Untrusted Data (CWE-502)
2026-07-30 VulnCheck
PHP RCE Deserialization E107
7.7
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
7.7 HIGH
CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
6.6 MEDIUM

AC:H and PR:H because exploitation requires prior out-of-band database write access, a high-privilege prerequisite; full C/I/A loss follows from arbitrary PHP eval execution.

3.1 AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
4.0 AV:N/AC:H/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

3
Source Code Evidence Fetched
Jul 30, 2026 - 14:51 vuln.today
Analysis Generated
Jul 30, 2026 - 14:51 vuln.today
CVE Published
Jul 30, 2026 - 13:41 cve.org
HIGH 7.7

DescriptionCVE.org

e107 prior to version 2.3.8 contains a code execution vulnerability in the e_array deserialization handler that allows an attacker with out-of-band database write access to execute arbitrary PHP code by storing a crafted payload in the user_prefs column. The e_array::unserialize() function in e107_handlers/core_functions.php performs only a prefix check for the string 'array' before passing the stored value to eval(), causing automatic PHP execution whenever the affected user's preferences are materialized through e_user_pref::load().

AnalysisAI

Second-order PHP code execution in e107 CMS before version 2.3.8 lets an attacker who already holds out-of-band write access to the database plant a crafted payload in the user_prefs column, which is later fed to eval() when that user's preferences load. The e_array::unserialize() handler validates only that the stored string begins with 'array' before evaluating it, so any account whose preferences are materialized triggers arbitrary PHP execution. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Obtain database write access
Delivery
Store crafted 'array' PHP payload in user_prefs
Exploit
Wait for e_user_pref::load() to materialize prefs
Execution
e_array::unserialize() passes value to eval()
Impact
Execute arbitrary PHP in web context
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Vulnerability AssessmentAI

Exploitation Exploitation requires out-of-band write access to the e107 database, specifically the ability to store a crafted value in the user_prefs column of a user record; the payload must begin with the string 'array' to pass e_array::unserialize()'s prefix check. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The vendor CVSS 4.0 score is 7.7 (High) with vector AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker who has obtained database write access - for example by chaining a separate SQL injection or reusing leaked DB credentials - stores a serialized 'array'-prefixed string containing malicious PHP in a target user's user_prefs column. The next time that user's preferences are materialized via e_user_pref::load(), e_array::unserialize() passes the payload to eval() and the PHP runs in the web application context. …
Remediation Upgrade to e107 2.3.8 or later, which contains the vendor fix referenced in commit 40e73cefde85b32e1227dfac9956a5cb87046277 (Patch available per vendor advisory; see GHSA-568x-w5qj-vr7c). … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, identify all e107 CMS instances running versions before 2.3.8, audit database access logs for unauthorized writes, and verify database security controls. …

Sign in for detailed remediation steps and compensating controls.

Threat intelligence, references, and detailed analysis are available after sign-in.

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EUVD-2026-51123 vulnerability details – vuln.today
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