CVE-2026-27124 FastMCP: Missing Consent Verification in OAuth Proxy Callback Facilitates Confused Deputy Vulnerabilities

FastMCP is the standard framework for building MCP applications. Prior to version 3.2.0, while testing the GitHubProvider OAuth integration, which allows authentication to a FastMCP MCP server via a FastMCP OAuthProxy using GitHub OAuth, it was discovered that the FastMCP OAuthProxy does not...

CVE-2026-27124

CVE-2026-27124 describes a Confused Deputy vulnerability in the FastMCP OAuthProxy used with the GitHubProvider OAuth integration. Prior to version 3.2.0, the OAuthProxy does not properly validate user consent after receiving the GitHub authorization code, and combined with GitHub’s consent-page ...

Unintended Proxy or Intermediary ('Confused Deputy')

Overview fastmcp is a The fast, Pythonic way to build MCP servers and clients. Affected versions of this package are vulnerable to Unintended Proxy or Intermediary 'Confused Deputy' in the OAuthProxy.handleidpcallback function. An attacker can gain unauthorized access to resources associated with...

GHSA-RWW4-4W9C-7733 FastMCP: Missing Consent Verification in OAuth Proxy Callback Facilitates Confused Deputy Vulnerabilities

Summary While testing the GitHubProvider OAuth integration, which allows authentication to a FastMCP MCP server via a FastMCP OAuthProxy using GitHub OAuth, it was discovered that the FastMCP OAuthProxy does not properly validate the user's consent upon receiving the authorization code from GitHu...

FastMCP: Missing Consent Verification in OAuth Proxy Callback Facilitates Confused Deputy Vulnerabilities

Summary While testing the GitHubProvider OAuth integration, which allows authentication to a FastMCP MCP server via a FastMCP OAuthProxy using GitHub OAuth, it was discovered that the FastMCP OAuthProxy does not properly validate the user's consent upon receiving the authorization code from GitHu...

PT-2026-29421

Name of the Vulnerable Software and Affected Versions: FastMCP versions prior to 3.2.0 Description: FastMCP is susceptible to a Confused Deputy issue within its GitHubProvider OAuth integration. The OAuthProxy component fails to properly validate user consent when receiving authorization codes fr...

CVE-2026-0107

In gmcddrhandlembamrreq of gmcmbaddr.c, there is a possible escalation of privileges due to a confused deputy. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation...

GO-2026-4778 Juju affected by Confused Deputy IDOR attack via Predictable user specified ID in Juju Secrets in github.com/juju/juju

Juju affected by Confused Deputy IDOR attack via Predictable user specified ID in Juju Secrets in github.com/juju/juju...

Juju affected by Confused Deputy IDOR attack via Predictable user specified ID in Juju Secrets

Summary Predictable secret ID and lack of secret origin API enable confused deputy attacks on Juju workloads. Details A Juju application can create a secret and grant it to another integrated application grantee. When they do so, the secret owner has to communicate the secret id to the grantee. T...

GHSA-5CJ2-RQQF-HX9P Juju affected by Confused Deputy IDOR attack via Predictable user specified ID in Juju Secrets

Summary Predictable secret ID and lack of secret origin API enable confused deputy attacks on Juju workloads. Details A Juju application can create a secret and grant it to another integrated application grantee. When they do so, the secret owner has to communicate the secret id to the grantee. T...

SUSE CVE-2026-23268

In the Linux kernel, the following vulnerability has been resolved: apparmor: fix unprivileged local user can do privileged policy management An unprivileged local user can load, replace, and remove profiles by opening the apparmorfs interfaces, via a confused deputy attack, by passing the opened...

EUVD-2026-12910

In the Linux kernel, the following vulnerability has been resolved: apparmor: fix unprivileged local user can do privileged policy management An unprivileged local user can load, replace, and remove profiles by opening the apparmorfs interfaces, via a confused deputy attack, by passing the opened...

CVE-2026-23268

In the Linux kernel, the following vulnerability has been resolved: apparmor: fix unprivileged local user can do privileged policy management An unprivileged local user can load, replace, and remove profiles by opening the apparmorfs interfaces, via a confused deputy attack, by passing the opened...

UBUNTU-CVE-2026-23268

In the Linux kernel, the following vulnerability has been resolved: apparmor: fix unprivileged local user can do privileged policy management An unprivileged local user can load, replace, and remove profiles by opening the apparmorfs interfaces, via a confused deputy attack, by passing the opened...

CVE-2026-23268

In the Linux kernel, the following vulnerability has been resolved: apparmor: fix unprivileged local user can do privileged policy management An unprivileged local user can load, replace, and remove profiles by opening the apparmorfs interfaces, via a confused deputy attack, by passing the opened...

CVE-2026-23268 apparmor: fix unprivileged local user can do privileged policy management

In the Linux kernel, the following vulnerability has been resolved: apparmor: fix unprivileged local user can do privileged policy management An unprivileged local user can load, replace, and remove profiles by opening the apparmorfs interfaces, via a confused deputy attack, by passing the opened...

PT-2026-26059

Name of the Vulnerable Software and Affected Versions Juju versions 3.0.0 through 3.6.18 Description Juju versions 3.0.0 through 3.6.18 are susceptible to a confused deputy issue stemming from predictable secret IDs XIDs. When a secret owner grants permissions to a secret to a grantee, the owner...

Nine CrackArmor Flaws in Linux AppArmor Enable Root Escalation, Bypass Container Isolation

Cybersecurity researchers have disclosed multiple security vulnerabilities within the Linux kernel's AppArmor module that could be exploited by unprivileged users to circumvent kernel protections, escalate to root, and undermine container isolation guarantees. The nine confused deputy...

Security Considerations for Artificial Intelligence Agents

This article, a lightly adapted version of Perplexity's response to NIST/CAISI Request for Information 2025-0035, details our observations and recommendations concerning the security of frontier AI agents. These insights are informed by Perplexity's experience operating general-purpose agentic...

EUVD-2026-10830

In gmcddrhandlembamrreq of gmcmbaddr.c, there is a possible escalation of privileges due to a confused deputy. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation...