CVE-2026-59860: CWE-94: Improper Control of Generation of Code ('Code Injection') in microsoft kiota
Kiota is an OpenAPI based HTTP Client code generator. Prior to 1.32.3, Kiota is affected by a code-generation injection vulnerability in the C# XML documentation-comment sink (the description, externalDocs label, and externalDocs link fields emitted as /// … comments). When text from an OpenAPI description is written into single-line XML doc comments without stripping newline and Unicode line-terminator characters, an attacker can break out of the /// comment line and inject additional code into generated C# clients. This issue is fixed in version 1.32.3.
AI Analysis
Technical Summary
CVE-2026-59860 is a code injection vulnerability (CWE-94) in Microsoft Kiota, an OpenAPI-based HTTP client code generator. The issue arises in versions before 1.32.3 when text from OpenAPI descriptions is inserted into single-line C# XML documentation comments without sanitizing newline and Unicode line-terminator characters. This allows an attacker to break out of the comment context and inject additional code into the generated client code. The vulnerability is addressed by sanitizing these characters in version 1.32.3.
Potential Impact
An attacker who can influence the OpenAPI description fields (description, externalDocs label, and externalDocs link) can inject arbitrary code into the generated C# client source code. This can lead to execution of malicious code when the generated client is compiled and run. The CVSS 4.0 score is 8.7 (high severity), reflecting network attack vector, low attack complexity, no privileges required, user interaction required, and high impact on confidentiality, integrity, and availability.
Mitigation Recommendations
A fix is available in Microsoft Kiota version 1.32.3. Users should upgrade to version 1.32.3 or later to remediate this vulnerability. No other official remediation or temporary fixes are documented. Patch status is not explicitly stated in the vendor advisory but the description confirms the issue is fixed in 1.32.3.
CVE-2026-59860: CWE-94: Improper Control of Generation of Code ('Code Injection') in microsoft kiota
Description
Kiota is an OpenAPI based HTTP Client code generator. Prior to 1.32.3, Kiota is affected by a code-generation injection vulnerability in the C# XML documentation-comment sink (the description, externalDocs label, and externalDocs link fields emitted as /// … comments). When text from an OpenAPI description is written into single-line XML doc comments without stripping newline and Unicode line-terminator characters, an attacker can break out of the /// comment line and inject additional code into generated C# clients. This issue is fixed in version 1.32.3.
CVSS v4.0
Score 8.7high
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-59860 is a code injection vulnerability (CWE-94) in Microsoft Kiota, an OpenAPI-based HTTP client code generator. The issue arises in versions before 1.32.3 when text from OpenAPI descriptions is inserted into single-line C# XML documentation comments without sanitizing newline and Unicode line-terminator characters. This allows an attacker to break out of the comment context and inject additional code into the generated client code. The vulnerability is addressed by sanitizing these characters in version 1.32.3.
Potential Impact
An attacker who can influence the OpenAPI description fields (description, externalDocs label, and externalDocs link) can inject arbitrary code into the generated C# client source code. This can lead to execution of malicious code when the generated client is compiled and run. The CVSS 4.0 score is 8.7 (high severity), reflecting network attack vector, low attack complexity, no privileges required, user interaction required, and high impact on confidentiality, integrity, and availability.
Mitigation Recommendations
A fix is available in Microsoft Kiota version 1.32.3. Users should upgrade to version 1.32.3 or later to remediate this vulnerability. No other official remediation or temporary fixes are documented. Patch status is not explicitly stated in the vendor advisory but the description confirms the issue is fixed in 1.32.3.
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: 6a58ef3568715ace43306138
Added to database: 07/16/2026, 14:48:21 UTC
Last enriched: 07/16/2026, 15:02:57 UTC
Last updated: 07/16/2026, 21:54:59 UTC
Views: 10
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