Commit 903dbda79b (#25370) introduced a
cross-site scripting vulnerability in the tooltips for the stream and
topic in the recipient bar. An attacker who can send messages could
maliciously craft a topic for the message, such that a victim who
hovers the tooltip for that topic in their message feed triggers
execution of JavaScript code controlled by the attacker.
Signed-off-by: Anders Kaseorg <anders@zulip.com>
Anders Kaseorg