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Sunday, 13 September 2026
8 agent hacks today▲ 7 vs yesterday (1)
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Incident database

Reflected XSS in Cloudflare agents SDK AI Playground OAuth callback (CVE-2026-1721)

A reflected cross-site scripting flaw in the AI Playground's OAuth callback handler allowed the `error_description` query parameter to be interpolated unescaped into an inline script tag. Exploitation via a crafted link could expose a victim's stored LLM chat history and let an attacker interact with MCP servers connected to the victim's session.

Disclosed 13 February 2026 · Record updated 13 September 2026

Impact

Attackers could execute arbitrary JavaScript in a victim's session context, stealing chat message history with LLMs and acting on the victim's behalf against connected public or authenticated MCP servers.

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Sources

  1. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-1721