A spip security update has been released for Debian GNU/Linux 9 LTS to address a cross-site scripting issue.

DLA 2579-1: spip security update

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Debian LTS Advisory DLA-2579-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Abhijith PA
March 02, 2021   https://wiki.debian.org/LTS
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Package : spip
Version : 3.1.4-4~deb9u4+deb9u1

It was discovered that SPIP, a website engine for publishing, would
allow a malicious user to perform cross-site scripting attacks, access
sensitive information, or execute arbitrary code.

For Debian 9 stretch, this problem has been fixed in version
3.1.4-4~deb9u4+deb9u1.

We recommend that you upgrade your spip packages.

For the detailed security status of spip please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/spip

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