A gnome-shell security update has been released for Debian GNU/Linux 12 to address an issue that allowed you to take screenshots on a locked machine.

[SECURITY] [DSA 5501-1] gnome-shell security update

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Debian Security Advisory DSA-5501-1 security@debian.org
https://www.debian.org/security/ Moritz Muehlenhoff
September 18, 2023 https://www.debian.org/security/faq
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Package : gnome-shell
CVE ID : CVE-2023-43090
Debian Bug : 1052067

Mickael Karatekin discovered that the GNOME session locking didn't
restrict a keyboard shortcut used for taking screenshots in GNOME
Screenshot which could result in information disclosure.

The oldstable distribution (bullseye) is not affected.

For the stable distribution (bookworm), this problem has been fixed in
version 43.6-1~deb12u2.

We recommend that you upgrade your gnome-shell packages.

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

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/