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CVE-2026-49827 – Unauthenticated RCE via Arbitrary File Upload – WebErpMesv2 ≤ 1.19

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Summary

CVE-2026-49827 is a critical unrestricted file upload vulnerability in WebErpMesv2, a web-based manufacturing execution and resource management system published by SMEWebify. The HR Expense module’s scan_file parameter allows any self-registered user to upload arbitrary PHP files to a web-accessible directory, which can be executed to achieve remote code execution. Because the application ships with open self-registration and broken role-based access middleware, the vulnerability is effectively exploitable by unauthenticated remote attackers on default installations, and it carries a CVSS v3.1 base score of 9.8 (Critical).

Technical details

  • Root cause: The HR Expense upload handler in HumanResourcesController.php (around lines 317–321) moves files submitted via the scan_file parameter into the web-accessible directory public/file/Expense/ using the original filename, without server-side MIME-type validation or a file-extension allowlist. This preserves the .php extension of uploaded files.
  • Trigger conditions: WebErpMesv2 allows open, unauthenticated self-registration, and its role-based access middleware does not correctly restrict access to the HR Expense functionality. This combination means an attacker does not need legitimate, pre-provisioned credentials to reach the vulnerable upload endpoint.
  • Attack vector: Network — an attacker self-registers an account (or otherwise reaches the endpoint due to the middleware flaw), uploads a PHP file disguised with an image content-type through the HR Expense scan_file parameter, and then requests the stored file at its predictable web-accessible path to trigger PHP code execution.
  • Impact: Full remote code execution on the underlying server, with complete loss of confidentiality, integrity, and availability of the host and any data it processes (CIA all rated High).

Affected software

  • Vendor: SMEWebify
  • Product: WebErpMesv2
  • Affected versions: 1.19 and earlier (advisory data also cites version 1.18 and earlier as vulnerable; no version is confirmed as officially patched at time of publication)

Severity

  • CVSS v3.1 Base Score: 9.8 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: No officially confirmed patched release has been documented for this advisory; organizations running WebErpMesv2 1.19 or earlier should apply the fix referenced in commit 5c54862fa044b363fd2be03d586750e81afd6818 in the SMEWebify/WebErpMesv2 repository, or upgrade to the earliest available release that incorporates this fix once published.
  • If no patch is available/applied, implement the following workarounds:
    • Disable or restrict open user self-registration until the fix is deployed.
    • Enforce a strict server-side file-extension allowlist (e.g., jpg, jpeg, png, pdf) on the HR Expense upload feature, and validate MIME type server-side rather than trusting client-supplied headers.
    • Store uploaded files outside the web root, or serve them with randomized, non-executable filenames and disable script execution (e.g., PHP handlers) in the upload directory.
    • Audit and correct the role-based access middleware so that authorization failures deny access by default.
    • Restrict network exposure of the application (e.g., place it behind a VPN or IP allowlist) until remediation is confirmed, and monitor for unexpected files or requests under public/file/Expense/.

References

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