A spip security update has been released for Debian GNU/Linux 10 and 11 to address a cross-site scripting issue.

DSA 5028-1: spip security update

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Debian Security Advisory DSA-5028-1 security@debian.org
  https://www.debian.org/security/ Sebastien Delafond
December 22, 2021   https://www.debian.org/security/faq
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Package : spip

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

For the oldstable distribution (buster), this problem has been fixed
in version 3.2.4-1+deb10u5.

For the stable distribution (bullseye), this problem has been fixed in
version 3.2.11-3+deb11u1.

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