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CVE-2026-25516

NiceGUI is a Python-based UI framework. The ui.markdown() component uses the markdown2 library to convert markdown content to HTML, which is then rendered via innerHTML. By default, markdown2 allows raw HTML to pass through unchanged. This means that if an application renders user-controlled content through ui.markdown(), an attacker can inject malicious HTML containing JavaScript event handlers. Unlike other NiceGUI components that render HTML (ui.html(), ui.chat_message(), ui.interactive_image
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:5041ef30410a4368e7c42fe7804c23ad04767610dc7b91fcd0b5a6356a022924
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"nicegui","vendor":"zauberzeug","versions":[{"status":"affected","version":"< 3.7.0"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:ae2d32eebab4fb00019e13b38af7bc6238869f1a80601f4ebf9b1e5b53877711 · sha256:5c824d14d14dae7e… · /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:ae2d32eebab4fb00019e13b38af7bc6238869f1a80601f4ebf9b1e5b53877711 · sha256:5c824d14d14dae7e… · /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:ae2d32eebab4fb00019e13b38af7bc6238869f1a80601f4ebf9b1e5b53877711 · sha256:5c824d14d14dae7e… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"name":"https://github.com/zauberzeug/nicegui/commit/f1f7533577875af7d23f161ed3627f73584cb561","tags":["x_refsource_MISC"],"url":"https://github.com/zauberzeug/nicegui/commit/f1f7533577875af7d23f161ed3627f73584cb561"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:ae2d32eebab4fb00019e13b38af7bc6238869f1a80601f4ebf9b1e5b53877711 · sha256:5c824d14d14dae7e… · /containers/cna/references/1
{"name":"https://github.com/zauberzeug/nicegui/security/advisories/GHSA-v82v-c5x8-w282","tags":["x_refsource_CONFIRM"],"url":"https://github.com/zauberzeug/nicegui/security/advisories/GHSA-v82v-c5x8-w282"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:ae2d32eebab4fb00019e13b38af7bc6238869f1a80601f4ebf9b1e5b53877711 · sha256:5c824d14d14dae7e… · /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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