It was discovered that there was a CSRF vulnerability in mailman, a web-based mailing list manager, which could allow an attacker to obtain a user's password.

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Debian Security Advisory DSA-3668-1                   This email address is being protected from spambots. You need JavaScript enabled to view it.
https://www.debian.org/security/                          Thijs Kinkhorst
September 15, 2016                    https://www.debian.org/security/faq
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Package        : mailman
CVE ID         : CVE-2016-6893
Debian Bug     : 835970

It was discovered that there was a CSRF vulnerability in mailman, a
web-based mailing list manager, which could allow an attacker to obtain
a user's password.

For the stable distribution (jessie), this problem has been fixed in
version 1:2.1.18-2+deb8u1.

For the unstable distribution (sid), this problem has been fixed in
version 1:2.1.23-1.

We recommend that you upgrade your mailman packages.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/

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