Is CVE-2026-35577 actively exploited?

No active exploitation of CVE-2026-35577 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-35577 be exploited remotely?

Yes. CVE-2026-35577 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-35577?

CVE-2026-35577 has a CVSS score of 6.8 (MEDIUM).

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MEDIUM

CVE-2026-35577

CWE-346Published: April 9, 2026· Updated: Apr 13, 2026

6.8

CVSS v3.1

EPSS:0.02%probability of exploitation in 30 daysPercentile:4.2th

Official Description

Apollo MCP Server is a Model Context Protocol server that exposes GraphQL operations as MCP tools. Prior to version 1.7.0, the Apollo MCP Server did not validate the Host header on incoming HTTP requests when using StreamableHTTP transport. In configurations where an HTTP-based MCP server is run on localhost without additional authentication or network-level controls, this could potentially allow a malicious website—visited by a user running the server locally—to use DNS rebinding techniques to bypass same-origin policy restrictions and issue requests to the local MCP server. If successfully exploited, this could allow an attacker to invoke tools or access resources exposed by the MCP server on behalf of the local user. This issue is limited to HTTP-based transport modes (StreamableHTTP). It does not affect servers using stdio transport. The practical risk is further reduced in deployments that use authentication, network-level access controls, or are not bound to localhost. This vulnerability is fixed in 1.7.0.

NVD Source

Technical Analysis

CVE-2026-35577 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), with a CVSS base score of 6.8.