XML Injection Affecting guzzlehttp/guzzle-services package, versions <1.5.4
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PHP-GUZZLEHTTPGUZZLESERVICES-17400375
- published22 Jun 2026
- disclosed19 Jun 2026
- creditGraham Campbell
Introduced: 19 Jun 2026
CVE-2026-53723 (opens in a new tab)How to fix?
Upgrade guzzlehttp/guzzle-services to version 1.5.4 or higher.
Overview
Affected versions of this package are vulnerable to XML Injection during request serialization of scalar XML element values. An attacker can smuggle raw XML markup into generated output by supplying a string that contains CDATA terminator ]]>. This lets attacker-controlled content break out of the intended text node and alter the structure of XML documents produced by the application, leading to malformed output or injected elements in downstream consumers.