It was discovered that GNOME Web incorrectly filtered certain strings. A remote attacker could use this issue to perform cross-site scripting (XSS) attacks. This issue only affected Ubuntu 20.04 LTS. (CVE-2021-45085, CVE-2021-45086, CVE-2021-45087)
It was discovered that GNOME Web incorrectly handled certain long page titles. A remote attacker could use this issue to cause GNOME Web to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2022-29536)