CVE-2026-81091
HighCVSS 8.6Exploitation Probability (EPSS)
Low risk28th percentile - higher than 28% of all known CVEs
Summary
The proxy middleware in mcp-use's inspector forwards requests to a destination named by the caller without inspecting the host. Loopback, link-local and private addresses were accepted, and validation was not reapplied to redirects. A caller could make the server issue requests to addresses reachable only from the host and read the responses. The current code calls isSafeProxyTarget, which checks addresses before proxying and bounds redirects.
Risk Assessment
Ability to send requests to internal addresses may lead to disclosure of sensitive information or attacks on internal services.
Recommendation
Upgrade mcp-use to a patched version that implements isSafeProxyTarget.
Related vulnerabilities
- CVE-2026-120197Critical
A flaw was found in WAVLINK WL-WN530HG4B (version M_V260724) in the port_forward function of /cgi-bin/wapi.cgi. Manipulation of the Name argument leads to OS command injection. The attack can be performed remotely and a public exploit is available.
- CVE-2026-120196Critical
A vulnerability was detected in WAVLINK WN579X3-D (version V250402) in the port_forward function of /cgi-bin/wapi.cgi. Manipulation of the Name argument results in OS command injection. The attack may be performed remotely and the exploit is publicly available.
- CVE-2026-120195Critical
A security vulnerability was detected in WAVLINK WL-WN579A3-A (version 2026-03-10-94f93d4) in the set_wzdgwMesh function of /cgi-bin/adm.cgi, within the Initial Setup Wizard component. Manipulation of the wlan_ssid argument leads to OS command injection. The attack can be carried out remotely and the exploit has been publicly disclosed.
- CVE-2026-120189Critical
A vulnerability was identified in D-Link DIR-505 1.10B02 in the save_upload_file/mp_upload_file function of /usr/bin/tftpd, which handles TFTP upload filenames. Manipulation of input leads to a stack-based buffer overflow. The attack can be carried out remotely, and a public exploit is available and might be used.
- CVE-2026-118636Critical
The JavaNativeMessageDecoder class in the Apache MINA 3.0 codec module calls ObjectInputStream.readObject() on frame bytes without any class filter. An application that places it in front of an untrusted peer is exposed to gadget-chain remote code execution. The 3.0.0 branch is inactive and no fix will be released for it.
- CVE-2026-120209Critical
AJ-Report through 1.7.1 signs share tokens with a hard-coded JWT secret, allowing attackers to forge valid Share-Tokens offline. Attackers can mint a token with reportCode 'dataSet' to access the testTransform endpoint, which passes scripts to GroovyClassLoader for unauthenticated remote code execution.
- CVE-2026-120201Critical
Jpom 2.10.0 through 2.11.12 contains an authentication bypass vulnerability that allows unauthenticated attackers to gain super-administrator access by injecting query conditions into the JPOM-USER-TOKEN header. Attackers can send a value like 'is not null', which Hutool's Condition parser treats as an operator, then execute commands through Jpom's script features.
- CVE-2026-118235Critical
The SimpleForm plugin for WordPress (versions up to and including 3.10.2) is vulnerable to arbitrary file upload via the handle_upload function. Missing a server-side file key allowlist and pre-sanitization extension derivation allows a trailing-dot filename to bypass all extension and MIME validation, enabling unauthenticated attackers to upload executable files and achieve remote code execution. The only access control is a nonce printed into every public form's data-nonce attribute, trivially obtainable by any unauthenticated visitor.
- CVE-2026-103882Critical
The Acadlix LMS plugin for WordPress (versions up to and including 1.1.9) is vulnerable to arbitrary file deletion due to insufficient file path validation in the post_delete_assessment_file_by_id function. Authenticated attackers with subscriber-level access or higher can delete arbitrary files on the server, potentially leading to remote code execution when critical files such as wp-config.php are deleted. The route's permission callback only verifies a generic wp_rest nonce emitted in the public acadlixOptions JavaScript object on every frontend page, effectively reducing the authentication requirement to unauthenticated.
- CVE-2026-119096Critical
The Uncanny Toolkit for LearnDash plugin for WordPress (up to 3.8.2) is vulnerable to Authentication Bypass via the 'email' parameter in uo_login_action(). A parser-differential flaw allows skipping account verification by using a raw string for lookup and a sanitized string for login. This lets unauthenticated attackers log in to unverified or suspended accounts if they know the credentials.
Original NVD description (English source)
The proxy middleware in mcp-use's inspector forwards requests to a destination the caller names. mountMcpProxy in libraries/typescript/packages/inspector/src/server/proxy/mcp-proxy.ts read the target from the X-Target-URL header or the __mcp_target parameter and proxied to it without inspecting the host, so loopback, link-local and private addresses were all accepted, as were names that resolve to them, and the validation was not reapplied to a redirect the destination returned. A caller could therefore make the server issue requests to addresses reachable only from the host it runs on and read the responses. The current code calls isSafeProxyTarget, which checks the resolved address against private, loopback and link-local ranges before proxying and bounds the number of redirects followed.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

