Update: CVE-2026-21873 - Zero-click XSS in all NiceGUI apps which uses `ui.sub_pages`

CVE ID : CVE-2026-21873 Published : Jan. 8, 2026, 10:15 a.m. | 29 minutes ago Description : NiceGUI is a Python-based UI framework. From versions 2.22.0 to 3.4.1, an unsafe implementation in the pushstate event listener used by ui.sub_pages allows an attacker to manipulate the fragment identifier of the URL, which they can do despite being cross-site, using an iframe. This issue has been patched in version 3.5.0. Severity: 7.2 | HIGH Visit the link for more details, such as CVSS details, affected products, timeline, and more...

Source: Telegram CVE Monitor