Improper Encoding or Escaping of Output in PHP - CVE-2026-7263

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Main Vulnerability Database Vulnerabilities #VU130908

Improper Encoding or Escaping of Output in PHP - CVE-2026-7263

Published: May 10, 2026


Vulnerability identifier: #VU130908
CSH Severity: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-7263
CWE-ID: CWE-116
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vulnerable software:
PHP
Software vendor:
PHP Group

Description

The vulnerability allows a remote attacker to cause incorrect XML canonicalization output.

The vulnerability exists due to improper handling of namespace declarations in Dom\XMLDocument::C14N() when processing XML after setAttributeNS(). A remote attacker can supply crafted XML content to cause incorrect XML canonicalization output.


Remediation

Install security update from vendor's website.

External links