XML::Sig Module XML Signature Bypass Vulnerabilities (CVE-2026-9487/9489/9490) Analysis

Vulnerability Overview The vulnerabilities mentioned in the webpage screenshot primarily involve multiple security issues within the module, specifically: 1. CVE-2026-9487: Allows invalid characters in the ID attribute. 2. CVE-2026-9489: Rejects signature checks when an ID references multiple nodes. 3. CVE-2026-9490: Allows invalid characters in the ID attribute. Affected Scope These vulnerabilities affect the security of the module during XML signature processing, potentially leading to the following issues: CVE-2026-9487: Attackers can bypass signature verification by inserting invalid characters into the ID attribute. CVE-2026-9489: Signature checks may be bypassed when an ID references multiple nodes, resulting in compromised data integrity. CVE-2026-9490: Similar to CVE-2026-9487, attackers can exploit invalid characters to bypass signatures. Remediation 1. CVE-2026-9487 and CVE-2026-9490: - Update the module to the latest version to ensure that invalid characters are not permitted in the ID attribute. - Specific remediation measures include: - Adding validation logic for the ID attribute in the file to ensure only valid characters are allowed. 2. CVE-2026-9489: - Update the module to the latest version to ensure that signature checks are executed correctly when an ID references multiple nodes. - Specific remediation measures include: - Adding handling logic for cases where an ID references multiple nodes in the file to ensure signature checks do not fail due to multiple node references. POC Code or Exploit Code No specific POC code or exploit code was provided on the page. Summary Vulnerability Overview: The module contains multiple security issues related to invalid characters in ID attributes and signature check problems when an ID references multiple nodes. Affected Scope: Signature verification may be bypassed, impacting data integrity. Remediation: Update the module to the latest version to disallow invalid characters in ID attributes and correctly handle cases where an ID references multiple nodes.

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XML::Sig Module XML Signature Bypass Vulnerabilities (CVE-2026-9487/9489/9490) Analysis