Description

Directory Traversal vulnerability in Pronis Loisirs Billetterie CSE - < 04/2026 allows a remote attacker to obtain sensitive information and execute arbitrary code.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "7.5",
  "pubDate": "2026-08-17T19:16:31.980Z",
  "pubdate": "2026-08-17T19:16:31.980Z",
  "executiveSummary": "An unauthenticated Directory Traversal vulnerability has been identified in Pronis Loisirs Billetterie CSE versions prior to 04/2026. This security flaw originates from improper input validation within the application handling of file paths, allowing remote unauthenticated attackers to supply specially crafted sequences of directory traversal characters.\nThe primary impact of this vulnerability encompasses unauthorized disclosure of sensitive system files and the potential execution of arbitrary code within the context of the underlying web application service. By manipulating path parameters, an adversary can bypass access control mechanisms to read arbitrary files accessible to the application process, potentially exposing configuration files, credentials, or source code.\nThe risk implications are critical, as successful exploitation enables total confidentiality compromise and could escalate to remote code execution depending on the file accessibility and server-side configurations. The attack vector is network-based, requiring no prior privileges or user interaction, lowering the barrier to entry for malicious actors.\nMitigation requires updating the affected product to version 04/2026 or later, implementing strict input sanitization routines, enforcing canonicalization checks on all file path parameters, and applying the principle of least privilege to the application runtime environment to limit post-exploitation impact.",
  "technicalDetails": "The vulnerability is classified as a Directory Traversal flaw, specifically involving improper limitation of a pathname to a restricted directory (CWE-22 equivalent). The root cause lies in the application's failure to adequately sanitize and validate user-supplied input utilized in file system operations. When the vulnerable component processes requests containing relative path traversal sequences such as dot-dot-slash (../), it fails to properly canonicalize the path, thereby permitting access outside the intended root directory.\nThe attack vector is network-based, exposing the application over HTTP or HTTPS protocols. Exploitation requires no prior authentication or administrative privileges, allowing any remote attacker with network access to the target system to initiate malicious requests. The vulnerable component is the file retrieval or document rendering module of Pronis Loisirs Billetterie CSE affecting all versions prior to 04/2026.\nThe step-by-step attack flow proceeds as follows: First, the attacker identifies a vulnerable endpoint or parameter within the application that accepts file paths or resource identifiers. Second, the attacker crafts a malicious HTTP request embedding directory traversal sequences into the targeted parameter to navigate upward through the directory structure. Third, the application processes the unsanitized input, resolves the path relative to the root directory, and accesses the target file outside the intended boundary. Finally, the application returns the contents of the sensitive file in the HTTP response, or in scenarios where file inclusion is leveraged, triggers the execution of arbitrary code contained within the accessible file.\nPost-exploitation impact includes the acquisition of sensitive configuration data, database credentials, application source code, and potentially remote code execution if the attacker can leverage the traversal to include and execute arbitrary scripts or interact with vulnerable local file inclusion mechanisms."
}