CVE-2018-18903: Critical – Vanilla 2.6.x before 2.6.4 allows remote code execution

CWE Weakness Definitions

CWE-94: Code Injection

Attacker injects arbitrary code that is executed by the application process.

Related Attack Patterns (CAPEC)

CAPEC-35 Leverage Executable Code in Non-Executable Files

via CWE-94

CAPEC-77 Manipulating User-Controlled Variables

via CWE-94

CAPEC-242 Code Injection

via CWE-94

Mapping is CWE-to-CAPEC per MITRE CAPEC 3.9.

◆ AI Analysis — automated analysis, not human-reviewed

This vulnerability was disclosed in 2018. A critical vulnerability affects Vanillaforums systems (CVE-2018-18903). No public exploit code is currently available. Isolate affected systems if patching is not feasible.

BSID: BS-2018-GLOBAL-217255-C • Model: rule-based-v1 • Confidence: MEDIUM

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Frequently Asked Questions

What is CVE-2018-18903?

This vulnerability was disclosed in 2018. A critical vulnerability affects Vanillaforums systems (CVE-2018-18903). No public exploit code is currently available. Isolate affected systems if patching is not feasible.

What is the CVSS score for CVE-2018-18903?

CVE-2018-18903 has CVSS 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS: 5.2%.

Is CVE-2018-18903 actively exploited?

No confirmed active exploitation of CVE-2018-18903 as of 2026-09-25.

How do I remediate CVE-2018-18903?

Priority: MEDIUM. Advisory: https://open.vanillaforums.com/discussion/36771/security-update-vanilla-2-6-4 PSIRT: [email protected]

What systems are affected by CVE-2018-18903?

CVE-2018-18903 affects Vanillaforums Vanilla.

Vulnerability Details

CVE ID	`CVE-2018-18903`
BSID	`BS-2018-GLOBAL-217255-C` BreachSpider Global ID
CVSS Vector	`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
Published	2018-11-03
Last Modified	2026-06-17
ICS Relevance	15%
Weakness (CWE)	Code Injection
Source	NVD

Official Description

Vanilla 2.6.x before 2.6.4 allows remote code execution.

Source: NIST NVD / MITRE CVE Database

Attack Vector Analysis — CITED Relevance

Vulnerability details: Vanilla 2.6.x before 2.6.4 allows remote code execution. CVSS vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Exploitation Likelihood: LOW

Affected Products

Vendor	Product	Affected Versions
Vanillaforums	Vanilla	`≥ 2.6.0, < 2.6.4`

Remediation

View Vendor Advisory →

Remediation Priority: MEDIUM

Vendor PSIRT: [email protected]

Threat Intelligence

● Threat Intelligence Validated: October 2026 | Threat Age: 2904 Days

CISA known-exploited	Not in KEV catalog
Public Exploit	Not confirmed
PoC Code	Not confirmed

AI Enrichment Record — provenance & audit hash

Model	`rule-based-v1`
Confidence	MEDIUM
Enriched At	2026-05-24
SHA-512 Audit Hash	`d32d726baa2dede8ca568accd719071c7d67f34ce110ee4de0f47e810c6ca86a9b9bb9938ec07cb1a63999dfe56b09c65717313a84607d5cc040cea177492be5`

Related CVEs affecting Vanillaforums

CVE-2011-3614 9.8 An Access Control vulnerability exists in the Facebook, Twitter, and Embedded... CVE-2017-1000432 8.0 Vanilla Forums below 2.1.5 are affected by CSRF leading to Deleting topics an... CVE-2013-3527 7.5 Multiple SQL injection vulnerabilities in Vanilla Forums before 2.0.18.8 allo... CVE-2013-3528 7.5 Unspecified vulnerability in the update check in Vanilla Forums before 2.0.18... CVE-2016-10073 7.5 The from method in library/core/class.email.php in Vanilla Forums before 2.3....

View all Vanillaforums CVEs →

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