CVE-2026-21873
CVSS v3
6.1
MEDIUM
EPSS Score
0.3 %
exploit probability, as of 2026-10-19
CISA KEV
No
known exploited
Exploitation
—
SSVC status
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Affected and fixed versions
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Packages
- niceguiPyPIfrom 2.22.0 · fixed in 3.5.0
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.
Technical details
- Published
- 2026-01-08
Frequently asked questions
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.