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PKCE Downgrade Attack: When the Authorization Server Accepts Both Flows
BACKGROUND
1 SIGNALFIRST DETECTED 6 September 2026
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How the story developed
6 Sept
PKCE Downgrade Attack: When the Authorization Server Accepts Both Flows
REPORT · WHEN · Dev.to
Other feeds and industry voices
12 Apr
RFC 7636 Deep Dive: How PKCE Kills Authorization Code Interception Attacks
<h1> Introduction </h1> <p>Last time, we tore apart the core mechanics of <strong>RFC 6749 (Authorization Code Grant)</strong>.</p> <ul> <li><a
REPORT · HOW · Dev.toOPEN STORY
6 Sept
OAuth Flow CSRF: How a Missing State Parameter Enables Forced Authorization
<p>The OAuth flow has four participants: client, authorization server, resource server, and, when <code>state</code> is absent, the attacker. RFC 6749 made the only CSRF control
REPORT · WHEN · Dev.toOPEN STORY
2 Sept
A provisioned Keycloak client inherits no PKCE pin, and the obvious fix is inert
<p>Keycloak 26.7.1, in a realm where every hand-authored client carries <code>"pkce.code.challenge.method": "S256"</code> and refuses <code>plain</code>. Enable the OAuth Client
REPORT · WHERE · Dev.toOPEN STORY
Sources
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