CWE-611

Improper Restriction of XML External Entity Reference

The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output.

CVE-2026-6807 (GCVE-0-2026-6807)

Vulnerability from cvelistv5 – Published: 2026-04-28 17:41 – Updated: 2026-04-29 15:12 Unsupported When Assigned
VLAI
Title
NSA GRASSMARLIN Improper Restriction of XML External Entity Reference
Summary
A vulnerability in GRASSMARLIN v3.2.1 allows crafted session data to trigger improper handling of XML input, which may result in unintended exposure of sensitive information. The flaw stems from insufficient hardening of the XML parsing process.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
Impacted products
Vendor Product Version
NSA GRASSMARLIN Affected: All versions
Create a notification for this product.
Credits
Grady DeRosa reported this vulnerability to CISA.
Show details on NVD website
To clipboard 

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CVE-2026-8045 (GCVE-0-2026-8045)

Vulnerability from cvelistv5 – Published: 2026-06-09 14:41 – Updated: 2026-06-09 16:01
VLAI
Summary
CWE-611 Improper Restriction of XML External Entity Reference vulnerability exists that could cause information disclosure of server-side file contents when an attacker with a Data Center Expert user account submits crafted XML payloads to SOAP service endpoints.
Severity
7.1 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-611 - Improper restriction of XML external entity reference
Assigner
References
Impacted products
Show details on NVD website
To clipboard 

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Mitigation

Phases: Implementation, System Configuration

Description:

  • Many XML parsers and validators can be configured to disable external entity expansion.
CAPEC-221: Data Serialization External Entities Blowup

This attack takes advantage of the entity replacement property of certain data serialization languages (e.g., XML, YAML, etc.) where the value of the replacement is a URI. A well-crafted file could have the entity refer to a URI that consumes a large amount of resources to create a denial of service condition. This can cause the system to either freeze, crash, or execute arbitrary code depending on the URI.

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