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Vulnerability of GNU Mailman: Cross Site Scripting via Cgi/private.py

Synthesis of the vulnerability 

An attacker can trigger a Cross Site Scripting via Cgi/private.py of GNU Mailman, in order to run JavaScript code in the context of the web site.
Impacted software: Debian, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this computer vulnerability: 2/4.
Creation date: 29/06/2020.
Références of this announce: CVE-2020-15011, DLA-2265-1, DLA-2276-1, openSUSE-SU-2020:1707-1, openSUSE-SU-2020:1752-1, SUSE-SU-2020:2048-1, USN-4406-1, VIGILANCE-VUL-32638.

Description of the vulnerability 

An attacker can trigger a Cross Site Scripting via Cgi/private.py of GNU Mailman, in order to run JavaScript code in the context of the web site.
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This computer vulnerability announce impacts software or systems such as Debian, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

Our Vigil@nce team determined that the severity of this cybersecurity bulletin is medium.

The trust level is of type confirmed by the editor, with an origin of document.

An attacker with a expert ability can exploit this threat alert.

Solutions for this threat 

Debian 8: new mailman packages.
New packages are available:
  Debian 8: mailman 1:2.1.18-2+deb8u7

Debian 9: new mailman packages.
New packages are available:
  Debian 9: mailman 1:2.1.23-1+deb9u6

openSUSE Leap 15.2: new mailman packages.
New packages are available:
  openSUSE Leap 15.2: mailman 2.1.34-lp152.7.3.1

SUSE LE 12 SP2-SP5: new mailman packages.
New packages are available:
  SUSE LE 12 SP2: mailman 2.1.17-3.23.1
  SUSE LE 12 SP3: mailman 2.1.17-3.23.1
  SUSE LE 12 SP4: mailman 2.1.17-3.23.1
  SUSE LE 12 SP5: mailman 2.1.17-3.23.1

SUSE LE 15 SP2: new mailman packages.
New packages are available:
  SUSE LE 15 SP2: mailman 2.1.34-bp152.7.3.1

Ubuntu: new mailman packages.
New packages are available:
  Ubuntu 18.04 LTS: mailman 1:2.1.26-1ubuntu0.3
  Ubuntu 16.04 LTS: mailman 1:2.1.20-1ubuntu0.6
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