Package: schleuder
Version: 4.0.3-7
Severity: important
Forwarded: https://0xacab.org/schleuder/schleuder/-/issues/530
Tags: bookworm fixed-upstream security upstream

Schleuder parses a request like

  x-subscribe: [email protected] <[email protected]> 
DEADBEEFDEADBEEFDEADBEEFDEADBEEFDEADBEEF

as 

  x-subscribe: [email protected] NULL TRUE

which assigns 'admin' privileges to this subscription.

This is dangerous behaviour. Unexpected input should always throw an
error, especially where admin permissions are being assigned.

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