{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","feed_url":"https://feed.craftedsignal.io/vendors/vtiger/feed.json","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["Vtiger CRM (\u003c= 8.4.0)"],"_cs_severities":["high"],"_cs_tags":["cve","rce","webserver","web-application","cms"],"_cs_type":"advisory","_cs_vendors":["Vtiger"],"content_html":"\u003cp\u003eVtiger CRM installations through version 8.4.0 are susceptible to an authenticated remote code execution vulnerability, tracked as CVE-2026-23698. This critical flaw resides within the administrative module's ModuleManager import feature, enabling authenticated attackers with administrator-level privileges to upload arbitrary PHP files. By submitting a specially crafted ZIP archive, which includes executable PHP code and a \u003ccode\u003emanifest.xml\u003c/code\u003e file, the application extracts these malicious files directly into the \u003ccode\u003emodules/\u003c/code\u003e directory under the web root. Crucially, this process bypasses Vtiger's internal file type validation beyond the \u003ccode\u003emanifest.xml\u003c/code\u003e, making the uploaded PHP files directly accessible via HTTP. This direct accessibility circumvents Vtiger's authentication and authorization mechanisms, as the web server resolves the path and executes the PHP interpreter before the application's routing layer intervenes. This results in a persistent web shell, granting the attacker full remote code execution capabilities independent of the initial session.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAttacker obtains valid administrator credentials for a vulnerable Vtiger CRM instance.\u003c/li\u003e\n\u003cli\u003eAttacker logs into the Vtiger CRM web interface using the compromised administrative account.\u003c/li\u003e\n\u003cli\u003eAttacker crafts a malicious ZIP archive containing one or more executable PHP files (e.g., a web shell) and a \u003ccode\u003emanifest.xml\u003c/code\u003e file configured to facilitate deployment.\u003c/li\u003e\n\u003cli\u003eAttacker navigates to the ModuleManager import feature, typically found within the admin module settings of Vtiger CRM.\u003c/li\u003e\n\u003cli\u003eAttacker uploads the specially crafted ZIP archive through the ModuleManager interface.\u003c/li\u003e\n\u003cli\u003eVtiger CRM processes the archive, extracting the malicious PHP files directly into the \u003ccode\u003emodules/\u003c/code\u003e directory within the web root without validating their executable nature.\u003c/li\u003e\n\u003cli\u003eAttacker accesses the newly deployed PHP web shell directly via HTTP (e.g., \u003ccode\u003ehttp://vtiger-crm.example.com/modules/malicious_shell.php\u003c/code\u003e), bypassing Vtiger's application-level authentication.\u003c/li\u003e\n\u003cli\u003eThe web server executes the malicious PHP web shell, granting the attacker persistent remote code execution and complete control over the compromised Vtiger CRM server.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2026-23698 grants authenticated attackers persistent remote code execution capabilities on the underlying server hosting Vtiger CRM. This allows for complete system compromise, including unauthorized data access, modification, or deletion, installation of additional malware (e.g., ransomware, cryptominers), and potential lateral movement within the compromised network. The ability to deploy a persistent web shell independent of Vtiger's authentication means the attacker can maintain access even if the original compromised administrator account is disabled or credentials are changed, posing a significant long-term threat to data integrity and confidentiality.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003ePatch CVE-2026-23698 immediately by upgrading Vtiger CRM to a version beyond 8.4.0, as soon as a patch is available.\u003c/li\u003e\n\u003cli\u003eDeploy the Sigma rule \u003ccode\u003eDetects CVE-2026-23698 Exploitation - Direct Web Shell Access in Vtiger CRM\u003c/code\u003e to your SIEM and tune for your environment to detect post-exploitation activity.\u003c/li\u003e\n\u003cli\u003eImplement strong authentication measures, such as Multi-Factor Authentication (MFA), for all Vtiger CRM administrator accounts to mitigate the risk of credential compromise.\u003c/li\u003e\n\u003cli\u003eMonitor web server access logs for direct HTTP requests to PHP files within the \u003ccode\u003e/modules/\u003c/code\u003e directory that are not part of standard Vtiger functionality.\u003c/li\u003e\n\u003cli\u003eHarden web server configurations to restrict PHP execution to only explicitly authorized directories, if feasible for your Vtiger CRM deployment.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-07-07T17:28:50Z","date_published":"2026-07-07T17:28:50Z","id":"https://feed.craftedsignal.io/briefs/2026-07-vtiger-rce/","summary":"Vtiger CRM versions up to and including 8.4.0 are vulnerable to authenticated remote code execution (CVE-2026-23698), allowing administrator-level attackers to upload malicious PHP web shells via the ModuleManager import function, bypassing authentication and leading to persistent system compromise.","title":"CVE-2026-23698: Vtiger CRM Authenticated Remote Code Execution","url":"https://feed.craftedsignal.io/briefs/2026-07-vtiger-rce/"}],"language":"en","title":"CraftedSignal Threat Feed - Vtiger","version":"https://jsonfeed.org/version/1.1"}