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MCP servers vulnerable to phishing attacks via insecure redirect URIs

By PulseAugur Editorial · [2 sources] ·

A security vulnerability exists in how some MCP servers handle client registration, specifically concerning redirect URIs. Many servers allow arbitrary redirect URIs, which attackers can exploit to phish user credentials. By registering a malicious client with a fake redirect URI, an attacker can trick users into approving access to their data, leading to unauthorized token acquisition. This issue has been observed in various MCP implementations, including those used by Slack, ChatGPT, and Cursor, with real-world examples like an attack on Square's MCP server exposing sensitive merchant data. AI

IMPACT Exploitable vulnerabilities in MCP servers could compromise user data and trust in AI-powered tools that rely on these integrations.

RANK_REASON The article discusses a security vulnerability in a specific protocol (OAuth) as implemented by MCP servers, affecting user data access and client authentication.

Read on Medium — MCP tag →

AI-generated summary · Google Gemini · from 2 sources. How we write summaries →

MCP servers vulnerable to phishing attacks via insecure redirect URIs

How we ranked this

Signal score
2 / 100
Composite score across the factors below. Higher = stronger signal that this story matters right now.
Newsworthiness bucket
Tool
The article discusses a security vulnerability in a specific protocol (OAuth) as implemented by MCP servers, affecting user data access and client authentication.
Source corroboration
2 independent sources
Multiple independent publishers reporting the same story raises confidence that it's real and newsworthy.
Topics
safety, product
Editorial topic classification. Feeds into how the story surfaces on /topic/<slug> hub pages and into the per-entity coverage mix.
AI-industry relevance
High
Clearly on-topic for AI-industry coverage.
Story freshness
Same-day
Cluster formed today. Ranking reflects the current source set at time of score.

Full methodology in our editorial standards.

COVERAGE [2]

  1. dev.to — MCP tag TIER_1 English(EN) · Alexander Loginov ·

    Letting users trust their own MCP clients, without opening a phishing hole

    <h2> The problem </h2> <p>You run your own agent: a Slack bot, a service on a VPS, an MCP client you wrote over a weekend. You want it on your files, which on <a href="https://streamvessel.com" rel="noopener noreferrer">Stream Vessel</a> means your own S3 bucket, where an agent c…

  2. Medium — MCP tag TIER_1 English(EN) · Alexander Loginov ·

    Letting users trust their own MCP clients, without opening a phishing hole

    <div class="medium-feed-item"><p class="medium-feed-image"><a href="https://medium.com/@alexander.l_24690/letting-users-trust-their-own-mcp-clients-without-opening-a-phishing-hole-f1cd537b2cca?source=rss------mcp-5"><img src="https://cdn-images-1.medium.com/max/1520/0*jcj5QY8_6eu…

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