PatchSiren cyber security CVE debrief
CVE-2026-23698 Vtiger CVE debrief
Vtiger CRM through 8.4.0 contains an authenticated remote code execution vulnerability in the admin module import feature. This vulnerability allows administrator-level attackers to upload arbitrary PHP files by submitting a crafted zip archive through the ModuleManager import function. The uploaded files are extracted directly into the modules/ directory under the web root without validating file types beyond the manifest.xml descriptor. As a result, attackers can place executable PHP files in the modules/ directory, which become directly accessible via HTTP. This bypasses Vtiger's authentication and authorization layer entirely since Apache resolves the path and invokes the PHP interpreter before the application routing layer is involved. Consequently, this results in a persistent web shell independent of the originating session.
- Vendor
- Vtiger
- Product
- Vtiger CRM
- CVSS
- HIGH 8.6
- CISA KEV
- Not listed in stored evidence
- Original CVE published
- 2026-07-07
- Original CVE updated
- 2026-07-07
- Advisory published
- 2026-07-07
- Advisory updated
- 2026-07-07
Who should care
System administrators and security professionals responsible for Vtiger CRM installations should be aware of this vulnerability. Given the high CVSS score of 8.6, this issue should be prioritized for immediate attention, especially in environments where the CRM system is exposed to the internet or accessible by a large number of users.
Technical summary
The vulnerability exists in the ModuleManager import function of Vtiger CRM, specifically in how it handles zip archives. An attacker with administrative privileges can upload a malicious zip file containing PHP files. These files are then extracted to the modules/ directory, which is directly accessible via HTTP. Since the files are placed within the web root and are executable, an attacker can leverage this to execute arbitrary PHP code, effectively gaining unauthenticated access to the system. The vulnerability is exacerbated by the lack of robust file type validation, as only the manifest.xml descriptor is checked, allowing for the bypass of security mechanisms.
Defensive priority
High
Recommended defensive actions
- Immediately apply the vendor's official patch or upgrade to a version of Vtiger CRM that addresses this vulnerability.
- Restrict access to the admin module import feature to only trusted administrators.
- Implement additional monitoring to detect and respond to potential exploitation attempts.
- Review and restrict write permissions to the modules/ directory under the web root.
- Consider implementing a Web Application Firewall (WAF) to detect and block suspicious file upload and execution patterns.
Evidence notes
The CVE record was published on 2026-07-07T17:16:36.123Z and has not been modified since then. The NVD entry is currently in the 'Received' status. Limited details are available about the specific affected versions and configurations beyond Vtiger CRM through 8.4.0. Further investigation is required to determine the full scope of potentially affected systems.
Official resources
AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-07T17:16:36.123Z and has not been modified since then. The NVD entry is currently in the 'Received' status.