EUVD-2026-1477

NiceGUI is a Python-based UI framework. From versions 2.22.0 to 3.4.1, an unsafe implementation in the click event listener used by ui.subpages, combined with attacker-controlled link rendering on the page, causes XSS when the user actively clicks on the link. This issue has been patched in versi...

CVE-2026-21872 NiceGUI apps are vulnerable to XSS which uses `ui.sub_pages` and render arbitrary user-provided links

NiceGUI is a Python-based UI framework. From versions 2.22.0 to 3.4.1, an unsafe implementation in the click event listener used by ui.subpages, combined with attacker-controlled link rendering on the page, causes XSS when the user actively clicks on the link. This issue has been patched in versi...

ai-plays-jackbox (>=0.0.1, <=0.3.2), aignostics (>=0.2.200, <=0.2.226) +32 more potentially affected by CVE-2026-21872 via nicegui (>=2.22.2, <=3.3.1)

nicegui PYPI version =2.22.2, =0.0.1, =0.2.200, =0.3.0, =0.1.3, =0.8.0, =1.11.0b1, =0.13.24, =0.4.24, =0.2.14, =0.30.0, =0.30.8 and more Source cves: CVE-2026-21872 Source advisory: MEND:CVE-2026-21872...

CVE-2026-21872 NiceGUI apps are vulnerable to XSS which uses `ui.sub_pages` and render arbitrary user-provided links

NiceGUI is a Python-based UI framework. From versions 2.22.0 to 3.4.1, an unsafe implementation in the click event listener used by ui.subpages, combined with attacker-controlled link rendering on the page, causes XSS when the user actively clicks on the link. This issue has been patched in versi...

CVE-2026-21872

NiceGUI (Python UI framework) versions 2.22.0–3.4.1 are affected by an XSS vulnerability caused by an unsafe implementation in the click event listener used by ui.sub_pages, combined with attacker-controlled link rendering on the page. The issue triggers when a user actively clicks a crafted link...

EUVD-2026-1478

NiceGUI is a Python-based UI framework. From versions 2.13.0 to 3.4.1, there is a XSS risk in NiceGUI when developers pass attacker-controlled strings into ui.navigate.history.push or ui.navigate.history.replace. These helpers are documented as History API wrappers for updating the browser URL...

CVE-2026-21871 NiceGUI is vulnerable to XSS via Unescaped URL in ui.navigate.history.push() / replace()

NiceGUI is a Python-based UI framework. From versions 2.13.0 to 3.4.1, there is a XSS risk in NiceGUI when developers pass attacker-controlled strings into ui.navigate.history.push or ui.navigate.history.replace. These helpers are documented as History API wrappers for updating the browser URL...

CVE-2026-21871 NiceGUI is vulnerable to XSS via Unescaped URL in ui.navigate.history.push() / replace()

NiceGUI is a Python-based UI framework. From versions 2.13.0 to 3.4.1, there is a XSS risk in NiceGUI when developers pass attacker-controlled strings into ui.navigate.history.push or ui.navigate.history.replace. These helpers are documented as History API wrappers for updating the browser URL...

CVE-2026-21871

Summary: NiceGUI (Python UI framework) versions 2.13.0–3.4.1 are affected by a DOM-based XSS vulnerability in ui.navigate.history.push() and ui.navigate.history.replace(). If an attacker-supplied string is embedded into generated JavaScript without proper escaping, it can escape the string contex...

CVE-2026-21871 NiceGUI is vulnerable to XSS via Unescaped URL in ui.navigate.history.push() / replace()

NiceGUI is a Python-based UI framework. From versions 2.13.0 to 3.4.1, there is a XSS risk in NiceGUI when developers pass attacker-controlled strings into ui.navigate.history.push or ui.navigate.history.replace. These helpers are documented as History API wrappers for updating the browser URL...

ai-plays-jackbox (>=0.0.1, <=0.3.2), aignostics (>=0.2.200, <=0.2.226) +33 more potentially affected by CVE-2026-21871 via nicegui (>=2.16.1, <=3.3.1)

nicegui PYPI version =2.16.1, =0.0.1, =0.2.200, =0.3.0, =0.1.3, =0.8.0, =1.11.0b1, =0.13.24, =0.4.24, =0.2.14, =0.30.0, =0.30.8 and more Source cves: CVE-2026-21871 Source advisory: MEND:CVE-2026-21871...

PT-2026-2113

Name of the Vulnerable Software and Affected Versions NiceGUI versions 2.10.0 through 3.4.1 Description NiceGUI is a Python-based UI framework. An unauthenticated attacker can exhaust Redis connections by repeatedly opening and closing browser tabs on any NiceGUI application using Redis-backed...

PT-2026-2112

Name of the Vulnerable Software and Affected Versions NiceGUI versions 2.22.0 through 3.4.1 Description NiceGUI is a Python-based UI framework. An unsafe implementation in the pushstate event listener used by ui.sub pages allows an attacker to manipulate the fragment identifier of the URL, even...

PT-2026-2111

Name of the Vulnerable Software and Affected Versions NiceGUI versions 2.22.0 through 3.4.1 Description NiceGUI is a Python-based UI framework susceptible to a cross-site scripting XSS issue. The problem stems from an unsafe implementation within the click event listener used by ui.sub pages,...

NiceGUI cross-site scripting vulnerability

NiceGUI is an easy-to-use, Python-based UI framework from NiceGUI Open Source. A cross-site scripting vulnerability exists in NiceGUI versions 2.22.0 through 3.4.1, which stems from an insecure implementation of the pushstate event listener that could lead to the manipulation of URL fragment...

NiceGUI cross-site scripting vulnerability

NiceGUI is NiceGUI open source an easy to use, Python based UI framework. A cross-site scripting vulnerability exists in NiceGUI versions 2.13.0 through 3.4.1, which stems from a cross-site scripting risk in the ui.navigate.history.push or replace function...

CVE-2026-21874: Missing Release of Resource after Effective Lifetime

NiceGUI is a Python-based UI framework. From versions v2.10.0 to 3.4.1, an unauthenticated attacker can exhaust Redis connections by repeatedly opening and closing browser tabs on any NiceGUI application using Redis-backed storage. Connections are never released, leading to service degradation wh...

PT-2026-2110

Name of the Vulnerable Software and Affected Versions NiceGUI versions 2.13.0 through 3.4.1 Description NiceGUI is a Python-based UI framework susceptible to a cross-site scripting XSS issue. The issue arises when developers provide attacker-controlled strings to the ui.navigate.history.push or...

CVE-2026-21872: Improper Neutralization of Input During Web Page Generation

NiceGUI is a Python-based UI framework. From versions 2.22.0 to 3.4.1, an unsafe implementation in the click event listener used by ui.subpages, combined with attacker-controlled link rendering on the page, causes XSS when the user actively clicks on the link. This issue has been patched in versi...

NiceGUI security vulnerability

NiceGUI is an easy-to-use, Python-based UI framework open-sourced by NiceGUI. A security vulnerability exists in NiceGUI versions v2.10.0 through 3.4.1, which originates from an unauthenticated attacker who can exhaust Redis connections, potentially resulting in a service degradation...