CVE-2026-101082 in PMWeb
Summary
by MITRE • 09/28/2026
A weakness has been identified in PMWeb 7.x/8.x/2025.x. This issue affects some unknown processing of the file downloader.aspx. This manipulation of the argument FullFileName/FileName causes path traversal. The attack may be initiated remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.
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Analysis
by VulDB Data Team • 09/28/2026
The vulnerability identified within PMWeb versions 7.x, 8.x, and 2025.x represents a critical security flaw rooted in improper input validation of file path arguments passed to the application's download functionality. Specifically, the endpoint responsible for handling file downloads, known as downloader.aspx, fails to adequately sanitize or validate the FullFileName and FileName parameters provided by the client request. This lack of rigorous verification allows an attacker to manipulate these inputs to traverse directory structures on the underlying server operating system. By injecting sequences such as dot-dot-slash characters into the filename argument, a malicious actor can bypass intended access controls that restrict file retrieval to specific directories designated for public or authorized content delivery.
This technical flaw is classified under CWE-22: Improper Limitation of a Pathname to a Restricted Directory, which highlights the failure to enforce strict boundaries on user-supplied input when constructing filesystem paths. The operational impact of this vulnerability is severe, as it enables remote code execution scenarios indirectly through data exfiltration or further system compromise. An attacker can leverage this path traversal capability to read sensitive files located outside the web root directory, including configuration files that may contain database credentials, API keys, or other secrets essential for maintaining the integrity and confidentiality of the PMWeb deployment. In environments where these exposed files hold administrative privileges or critical business data, the breach could lead to significant financial loss, regulatory non-compliance, and reputational damage.
The threat landscape surrounding this vulnerability is exacerbated by the fact that exploit code has been publicly released. This availability significantly lowers the barrier to entry for malicious actors who may not possess advanced technical skills but can utilize existing tools to target vulnerable instances across the internet. Since PMWeb is often deployed in enterprise environments handling sensitive project management data, the potential scale of impact is substantial. The remote nature of the attack means that no prior authentication or physical access to the network perimeter is required, allowing for widespread automated scanning and exploitation campaigns targeting unpatched systems globally.
The vendor's lack of response to early disclosure attempts raises concerns regarding their incident handling procedures and commitment to customer security. This silence leaves administrators without official patches or guidance on temporary mitigations until a fix is eventually provided. In the interim, organizations running affected versions must implement compensating controls to mitigate risk. Network-level defenses such as Web Application Firewalls should be configured to detect and block requests containing path traversal patterns in URL parameters. Additionally, restricting outbound traffic from application servers can limit the impact if an attacker attempts to exfiltrate data via DNS or HTTP channels. Regular audits of file access logs for anomalous directory traversal attempts are also recommended to identify potential active exploitation efforts before significant damage occurs.
From a strategic perspective, this incident underscores the importance of robust secure development lifecycles and proactive vulnerability management practices. The flaw aligns with ATT&CK technique T1083: File and Directory Discovery, as it facilitates the enumeration and retrieval of files from restricted locations on the target system. Organizations should prioritize patching or upgrading to a version where this issue has been resolved by the vendor once available. Until then, treating PMWeb instances as potentially compromised is advisable if they are exposed to untrusted networks without adequate web application firewall protection. Continuous monitoring for indicators of compromise related to file access patterns remains critical in maintaining the security posture of these systems against both known and emerging threats.