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9.3
CRITICAL CVSS 4.0
CVE-2026-59864
Kiota: Path/URL injection into generated Copilot plugin manifest via x-ai-* extensions
Overview
Description

Kiota is an OpenAPI based HTTP Client code generator. Prior to 1.32.5, `kiota plugin add` and `kiota plugin generate` (with `-t APIPlugin`) emitted attacker-controlled static_template.file values from x-ai-adaptive-card and x-ai-capabilities into generated Microsoft 365 Copilot and Teams plugin manifests without path validation, allowing ../, absolute, rooted, UNC, Windows drive, or URI paths in response_semantics.static_template.file to cause path traversal or out-of-package file inclusion when the generated plugin was deployed. This issue is fixed in version 1.32.5.

Details
INFO

Published Date :

July 16, 2026, 4:19 p.m.

Last Modified :

July 16, 2026, 4:19 p.m.

Remotely Exploit :

Yes !

Source :

[email protected]
Impact
Affected Products

The following products are affected by CVE-2026-59864 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Microsoft kiota
: Total Affected Vendor : 1 | Products : 1
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 134c704f-9b21-4f2e-91b3-4a467353bcc0
CVSS 4.0 CRITICAL [email protected]
Solution
Update Kiota to version 1.32.5 or later to fix path traversal vulnerability.
  • Update Kiota to version 1.32.5.
  • Verify plugin manifest file paths.
  • Validate user-supplied file paths.
References
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-59864.

URL Resource
https://github.com/microsoft/kiota/commit/9a185994a4e549b7bba3cc2beffb9736aa902e79
https://github.com/microsoft/kiota/pull/7892
https://github.com/microsoft/kiota/releases/tag/v1.32.5
https://github.com/microsoft/kiota/security/advisories/GHSA-4jwf-m4wg-8p66
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-59864 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-59864 weaknesses.

CAPEC-64: Using Slashes and URL Encoding Combined to Bypass Validation Logic Using Slashes and URL Encoding Combined to Bypass Validation Logic CAPEC-76: Manipulating Web Input to File System Calls Manipulating Web Input to File System Calls CAPEC-78: Using Escaped Slashes in Alternate Encoding Using Escaped Slashes in Alternate Encoding CAPEC-79: Using Slashes in Alternate Encoding Using Slashes in Alternate Encoding CAPEC-126: Path Traversal Path Traversal CAPEC-175: Code Inclusion Code Inclusion CAPEC-201: Serialized Data External Linking Serialized Data External Linking CAPEC-228: DTD Injection DTD Injection CAPEC-251: Local Code Inclusion Local Code Inclusion CAPEC-252: PHP Local File Inclusion PHP Local File Inclusion CAPEC-253: Remote Code Inclusion Remote Code Inclusion CAPEC-263: Force Use of Corrupted Files Force Use of Corrupted Files CAPEC-538: Open-Source Library Manipulation Open-Source Library Manipulation CAPEC-549: Local Execution of Code Local Execution of Code CAPEC-640: Inclusion of Code in Existing Process Inclusion of Code in Existing Process CAPEC-660: Root/Jailbreak Detection Evasion via Hooking Root/Jailbreak Detection Evasion via Hooking CAPEC-695: Repo Jacking Repo Jacking CAPEC-698: Install Malicious Extension Install Malicious Extension

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-59864 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
Vulnerability Scoring Details
Base CVSS Score: 9.3
Attack Vector
Attack Complexity
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