Arbitrary file upload in Vtiger Crm
CVE-2026-23697
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.
Vulnerability class: Unrestricted File Upload
EPSS: 0.011 (62.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Vtiger Crm — versions 0, 8.4.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- disclosure@vulncheck.com (technical-description, exploit)
- disclosure@vulncheck.com (product)
- disclosure@vulncheck.com (third-party-advisory)
Frequently asked questions
- What is CVE-2026-23697?
- CVE-2026-23697 is a high-severity vulnerability in Vtiger Crm, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 8.8/10. Published 2026-07-07.
- How severe is CVE-2026-23697?
- High severity. CVSS v3 base score is 8.8 out of 10.
- Is CVE-2026-23697 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.