SSRF in Microsoft Dynamics 365 Online msdyn_UCIClientAuth OData endpoint
CVE-2026-32210 is a critical server-side request forgery vulnerability in Microsoft Dynamics 365 Online affecting the msdyn_UCIClientAuth OData endpoint. According to the provided content, the vulnerable functionality accepted attacker-controlled input in parameters including EndpointEnum and TokenAudience. The root cause was insufficient validation of the EndpointEnum parameter, which allowed arbitrary attacker-supplied URLs to be used for backend outbound HTTP requests. When triggered, the Dynamics 365 backend could issue a request to an attacker-controlled server and include the authenticated victim's bearer token in the Authorization header. The provided analysis further states that setting TokenAudience to null could cause issuance of a broader-scoped Power Platform token with audience https://api.powerplatform.com rather than a narrower service-specific token. This enabled theft of a victim-associated token through a single crafted URL delivered to an authenticated Dynamics 365 user. Microsoft classified the issue as SSRF and described the security impact category as spoofing.
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Recent activity
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A server-side request forgery vulnerability in Microsoft Dynamics 365 (Online) that allows an unauthorized attacker to perform spoofing over a network.
A critical server-side request forgery vulnerability in Microsoft Dynamics 365 Online's msdyn_UCIClientAuth OData endpoint that allowed attacker-controlled URLs to receive authenticated users' bearer tokens, enabling broad access to Power Platform resources.
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Cross-references every affected SKU, including bundled OEM variants.
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