CVE-2026-22905
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Path Traversal Allows Authentication Bypass in CGI Endpoints

Publication date: 2026-02-09

Last updated on: 2026-02-09

Assigner: CERT VDE

Description
An unauthenticated remote attacker can bypass authentication by exploiting insufficient URI validation and using path traversal sequences (e.g., /js/../cgi-bin/post.cgi), gaining unauthorized access to protected CGI endpoints and configuration downloads.
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Meta Information
Published
2026-02-09
Last Modified
2026-02-09
Generated
2026-06-16
AI Q&A
2026-02-09
EPSS Evaluated
2026-06-15
NVD
CVE-2026-22905
EUVD
EUVD-2026-6927
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
wago 852-1328 to 2.65 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-22 The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.
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Executive Summary

This vulnerability allows an unauthenticated remote attacker to bypass authentication by exploiting insufficient URI validation combined with path traversal sequences such as /js/../cgi-bin/post.cgi.

By doing so, the attacker can gain unauthorized access to protected CGI endpoints and configuration downloads that should normally be restricted.

Impact Analysis

The impact of this vulnerability is that an attacker can access sensitive configuration data or protected CGI endpoints without any authentication.

This unauthorized access could lead to exposure of sensitive information or unauthorized changes to system configurations.

The CVSS v3.1 base score of 7.5 indicates a high severity, with the vulnerability allowing network-based attacks with low attack complexity and no privileges or user interaction required.

Compliance Impact

I don't know

Detection Guidance

This vulnerability involves an unauthenticated remote attacker exploiting insufficient URI validation and path traversal sequences to access protected CGI endpoints and configuration downloads.

To detect this vulnerability on your network or system, you can monitor HTTP requests for suspicious URI patterns that include path traversal sequences such as '/../' or specifically attempts to access paths like /js/../cgi-bin/post.cgi.

Suggested commands include using network traffic analysis tools or web server logs to search for these patterns. For example, using grep on web server logs:

  • grep -E '\.\./|/js/\.\./cgi-bin/post.cgi' /var/log/httpd/access_log
  • Using network packet capture tools like tcpdump or Wireshark to filter HTTP requests containing path traversal sequences.
Mitigation Strategies

Immediate mitigation steps include restricting access to the vulnerable CGI endpoints and configuration download paths, implementing proper URI validation to block path traversal sequences, and applying access controls to prevent unauthenticated access.

Since the vulnerability allows bypassing authentication via path traversal, it is critical to patch or update the affected software or firmware as soon as a fix is available.

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