CVE Explorer

CVE-2026-21871

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 without page reload. However, if the URL argument is embedded into generated JavaScript without proper escaping, a crafted payload can break out of the intended string context and execute arbitrary Jav

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:a60b483cd0d435b5e2db55c4b838b5a15532da8f7da1e25739bbaf7db2e240ac

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"product":"nicegui","vendor":"zauberzeug","versions":[{"status":"affected","version":">= 2.13.0, < 3.5.0"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:4059554a0a7268bbaee823bc7b5078bb2c76c77f1be412b8266d7514f0657f92 · sha256:2f0f2fa64e78390b… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.1,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:4059554a0a7268bbaee823bc7b5078bb2c76c77f1be412b8266d7514f0657f92 · sha256:2f0f2fa64e78390b… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion

{"cweId":"CWE-79","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:4059554a0a7268bbaee823bc7b5078bb2c76c77f1be412b8266d7514f0657f92 · sha256:2f0f2fa64e78390b… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions

{"name":"https://github.com/zauberzeug/nicegui/releases/tag/v3.5.0","tags":["x_refsource_MISC"],"url":"https://github.com/zauberzeug/nicegui/releases/tag/v3.5.0"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:4059554a0a7268bbaee823bc7b5078bb2c76c77f1be412b8266d7514f0657f92 · sha256:2f0f2fa64e78390b… · /containers/cna/references/1

{"name":"https://github.com/zauberzeug/nicegui/security/advisories/GHSA-7grm-h62g-5m97","tags":["x_refsource_CONFIRM"],"url":"https://github.com/zauberzeug/nicegui/security/advisories/GHSA-7grm-h62g-5m97"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:4059554a0a7268bbaee823bc7b5078bb2c76c77f1be412b8266d7514f0657f92 · sha256:2f0f2fa64e78390b… · /containers/cna/references/0

Attribution and limitations

CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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