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CVE-2026-41134

Microsoft Kiota code injection

7.8 HIGHPublic exploitEPSS 0.35%
  1. Published22 Apr 2026

Description

Kiota is an OpenAPI based HTTP Client code generator. Versions prior to 1.29.1 and 1.31.1 are affected by a code-generation literal injection vulnerability in multiple writer sinks (for example: serialization/deserialization keys, path/query parameter mappings, URL template metadata, enum/property metadata, and default value emission). When malicious values from an OpenAPI description are emitted into generated source without context-appropriate escaping, an attacker can break out of string literals and inject additional code into generated clients. This issue is only practically exploitable when the OpenAPI description used for generation is from an untrusted source, or a normally trusted OpenAPI description has been compromised/tampered with. Only generating from trusted, integrity-protected API descriptions significantly reduces the risk. To remediate the issue, upgrade Kiota to 1.29.1, 1.31.1, or later and regenerate/refresh existing generated clients as a precaution. Refreshing generated clients ensures previously generated vulnerable code is replaced with hardened output.

CVSS 3.1 breakdown

Attack vectorLocal
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

Microsoft Kiota< 1.31.1

Remediation

Fixed in
Microsoft Kiota≥ 1.31.1

References

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Frequently asked

Is CVE-2026-41134 being actively exploited?

CVE-2026-41134 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.35%.

How severe is CVE-2026-41134?

CVE-2026-41134 has a CVSS 3.1 base score of 7.8, rated high. EPSS estimates a 0.35% probability of exploitation.

Which products are affected by CVE-2026-41134?

Affected products include Microsoft Kiota.

How do I fix CVE-2026-41134?

Upgrade affected software to a fixed version, for example Microsoft Kiota 1.31.1 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.