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Vtiger CRM EUVDEUVD-2026-42055

| CVE-2026-23697 HIGH
Unrestricted Upload of File with Dangerous Type (CWE-434)
2026-07-07 VulnCheck GHSA-3cpr-2h94-j6qj
PHP Apache RCE File Upload Vtiger Crm
8.7
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
8.7 HIGH
CVSS:4.0/AV:N/AC:L/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
9.9 CRITICAL

Authenticated upload (PR:L) over the network with low complexity; scope changed (S:C) because a low-priv app account leads to unauthenticated OS-level code execution, with full C/I/A impact.

3.1 AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:L/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:L/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
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

2
Analysis Generated
Jul 07, 2026 - 17:18 vuln.today
CVE Published
Jul 07, 2026 - 16:17 cve.org
HIGH 8.7

DescriptionCVE.org

Vtiger CRM before 8.4.0 contains an authenticated file upload vulnerability that allows low-privileged users to achieve remote code execution by uploading a .phar file containing arbitrary PHP code through the Documents module, bypassing the extension denylist in config.inc.php which omits the .phar extension. The uploaded file is stored with its original .phar extension under the web-accessible storage directory, and a misconfigured .htaccess using Apache 2.2 syntax is silently ignored on Apache 2.4 deployments, allowing unauthenticated HTTP requests to directly execute the uploaded PHP payload.

AnalysisAI

Remote code execution in Vtiger CRM before 8.4.0 lets an authenticated low-privileged user upload a malicious .phar file through the Documents module and execute arbitrary PHP. The extension denylist in config.inc.php omits .phar, and a stale Apache 2.2-syntax .htaccess is silently ignored on Apache 2.4, so the payload lands in a web-accessible directory reachable by unauthenticated HTTP - the attack begins authenticated but the final execution step is unauthenticated. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Authenticate with low-privileged CRM account
Delivery
Upload .phar web shell via Documents module
Exploit
Bypass incomplete extension denylist
Execution
File stored in web-accessible directory
Persist
Request URL, ignored .htaccess allows execution
Impact
Arbitrary PHP runs on server
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Vulnerability AssessmentAI

Exploitation Requires a valid low-privileged Vtiger CRM account (PR:L) with access to the Documents module to perform the upload - the initial step is authenticated, not anonymous. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment This is a genuine priority, not a paper-high score. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker with any low-privileged Vtiger CRM login opens the Documents module and uploads a .phar file containing a PHP web shell, which passes the incomplete denylist and is saved with its .phar extension in the web-accessible storage directory. Because the Apache 2.4 server ignores the outdated .htaccess, the attacker (or anyone) then requests the file's URL directly over HTTP, and Apache/PHP execute the payload, yielding arbitrary code execution on the server. …
Remediation Upgrade to Vtiger CRM 8.4.0 or later, which is the first release that closes this issue (Vendor-released patch: 8.4.0). … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Inventory all Vtiger CRM instances and identify versions below 8.4.0; restrict access to the Documents module to administrative users only and require multi-factor authentication for all CRM users. …

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

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EUVD-2026-42055 vulnerability details – vuln.today
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