CVE-2021-40347

PoC ×2—

CVSS 3.1

5.4 medium

EPSS

1%p66

Published

Sep 10, 2021 (Sep 10, 2021)

Modified

Jun 17, 2026

Description

An issue was discovered in views/list.py in GNU Mailman Postorius before 1.3.5. An attacker (logged into any account) can send a crafted POST request to unsubscribe any user from a mailing list, also revealing whether that address was subscribed in the first place.

Vendors: postorius project
Products: postorius
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

NVD CVE.org GitHub PoCs EPSS (1.2%)

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