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CVE-2026-42090

Notesnook is a note-taking app focused on user privacy & ease of use. Prior to Notesnook Web/Desktop version 3.3.15 and prior to Notesnook iOS/Android version 3.3.20, a stored XSS vulnerability in the note export flow can be escalated to remote code execution in the desktop app. The root cause is that exported note fields such as title, headline, and content are inserted into the generated HTML template without HTML escaping. When the note is later exported to PDF, Notesnook renders that HTML in
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:748f84dbe1a008181dc606fa2ecc781d1c22ec85998ffd975232d5e2d0d9587e
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"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:v2:2d9d57fa06083cc3c63a38ecee669686f0dc2b510d74fcd6aea688076e10939d · sha256:81e157d34741c91a… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-94","description":"CWE-94: Improper Control of Generation of Code ('Code Injection')","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:2d9d57fa06083cc3c63a38ecee669686f0dc2b510d74fcd6aea688076e10939d · sha256:81e157d34741c91a… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

1 source assertion
{"product":"notesnook","vendor":"streetwriters","versions":[{"status":"affected","version":"Notesnook Web/Desktop < 3.3.15"},{"status":"affected","version":"Notesnook iOS/Android < 3.3.20"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:2d9d57fa06083cc3c63a38ecee669686f0dc2b510d74fcd6aea688076e10939d · sha256:81e157d34741c91a… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":9.6,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:2d9d57fa06083cc3c63a38ecee669686f0dc2b510d74fcd6aea688076e10939d · sha256:81e157d34741c91a… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"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:v2:2d9d57fa06083cc3c63a38ecee669686f0dc2b510d74fcd6aea688076e10939d · sha256:81e157d34741c91a… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-94","description":"CWE-94: Improper Control of Generation of Code ('Code Injection')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:2d9d57fa06083cc3c63a38ecee669686f0dc2b510d74fcd6aea688076e10939d · sha256:81e157d34741c91a… · /containers/cna/problemTypes/1/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/streetwriters/notesnook/releases/tag/3.3.20-android","tags":["x_refsource_MISC"],"url":"https://github.com/streetwriters/notesnook/releases/tag/3.3.20-android"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:2d9d57fa06083cc3c63a38ecee669686f0dc2b510d74fcd6aea688076e10939d · sha256:81e157d34741c91a… · /containers/cna/references/1
{"name":"https://github.com/streetwriters/notesnook/releases/tag/v3.3.15","tags":["x_refsource_MISC"],"url":"https://github.com/streetwriters/notesnook/releases/tag/v3.3.15"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:2d9d57fa06083cc3c63a38ecee669686f0dc2b510d74fcd6aea688076e10939d · sha256:81e157d34741c91a… · /containers/cna/references/2
{"name":"https://github.com/streetwriters/notesnook/security/advisories/GHSA-fjm8-jg78-89h4","tags":["x_refsource_CONFIRM"],"url":"https://github.com/streetwriters/notesnook/security/advisories/GHSA-fjm8-jg78-89h4"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:2d9d57fa06083cc3c63a38ecee669686f0dc2b510d74fcd6aea688076e10939d · sha256:81e157d34741c91a… · /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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