CVE-2026-59859: CWE-94: Improper Control of Generation of Code ('Code Injection') in microsoft kiota
CVE-2026-59859 is a high-severity code injection vulnerability in Microsoft Kiota, an OpenAPI-based HTTP client code generator. Prior to version 1.32.4, the PHP generator improperly handled schema-derived strings by embedding them into double-quoted PHP literals without escaping the dollar sign ($). This allowed attacker-controlled interpolation constructs such as ${...}, $var, or {$obj->prop} to inject arbitrary PHP code into generated model and request-builder classes. The issue is fixed in version 1.32.4.
AI Analysis
Technical Summary
Microsoft Kiota versions before 1.32.4 contain a code injection vulnerability (CWE-94) in the PHP code generator. The vulnerability arises because the SanitizeDoubleQuote() function in Writers/StringExtensions.cs fails to escape the dollar sign ($) in OpenAPI schema-derived strings embedded into PHP double-quoted literals. This allows an attacker to inject arbitrary PHP code via specially crafted OpenAPI descriptions that include interpolation constructs. The vulnerability is resolved in Kiota version 1.32.4.
Potential Impact
An attacker who can supply or influence the OpenAPI description used by Kiota's PHP generator can inject arbitrary PHP code into generated classes. This can lead to remote code execution in environments where the generated code is used, posing a significant security risk.
Mitigation Recommendations
Upgrade to Kiota version 1.32.4 or later, where this vulnerability is fixed by properly escaping the dollar sign in PHP double-quoted literals. No other mitigation is indicated. Patch status is not explicitly confirmed in the advisory, but the fix is stated to be in version 1.32.4.
CVE-2026-59859: CWE-94: Improper Control of Generation of Code ('Code Injection') in microsoft kiota
Description
CVE-2026-59859 is a high-severity code injection vulnerability in Microsoft Kiota, an OpenAPI-based HTTP client code generator. Prior to version 1.32.4, the PHP generator improperly handled schema-derived strings by embedding them into double-quoted PHP literals without escaping the dollar sign ($). This allowed attacker-controlled interpolation constructs such as ${...}, $var, or {$obj->prop} to inject arbitrary PHP code into generated model and request-builder classes. The issue is fixed in version 1.32.4.
CVSS v4.0
Score 8.7high
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Microsoft Kiota versions before 1.32.4 contain a code injection vulnerability (CWE-94) in the PHP code generator. The vulnerability arises because the SanitizeDoubleQuote() function in Writers/StringExtensions.cs fails to escape the dollar sign ($) in OpenAPI schema-derived strings embedded into PHP double-quoted literals. This allows an attacker to inject arbitrary PHP code via specially crafted OpenAPI descriptions that include interpolation constructs. The vulnerability is resolved in Kiota version 1.32.4.
Potential Impact
An attacker who can supply or influence the OpenAPI description used by Kiota's PHP generator can inject arbitrary PHP code into generated classes. This can lead to remote code execution in environments where the generated code is used, posing a significant security risk.
Mitigation Recommendations
Upgrade to Kiota version 1.32.4 or later, where this vulnerability is fixed by properly escaping the dollar sign in PHP double-quoted literals. No other mitigation is indicated. Patch status is not explicitly confirmed in the advisory, but the fix is stated to be in version 1.32.4.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-07-07T15:41:53.606Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a58ef3568715ace43306131
Added to database: 07/16/2026, 14:48:21 UTC
Last enriched: 07/16/2026, 15:03:05 UTC
Last updated: 07/16/2026, 20:48:57 UTC
Views: 9
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