A shibboleth-sp security update has been released for Debian GNU/Linux 10 to address the possibility of phishing attacks.

DSA 4872-1: shibboleth-sp security update

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Debian Security Advisory DSA-4872-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
March 18, 2021   https://www.debian.org/security/faq
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Package : shibboleth-sp
CVE ID : not yet available
Debian Bug : 985405

Toni Huttunen discovered that the Shibboleth service provider's template
engine used to render error pages could be abused for phishing attacks.

For additional information please refer to the upstream advisory at
  https://shibboleth.net/community/advisories/secadv_20210317.txt

For the stable distribution (buster), this problem has been fixed in
version 3.0.4+dfsg1-1+deb10u1.

We recommend that you upgrade your shibboleth-sp packages.

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

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/