CVE Explorer

CVE-2026-31876

Notesnook is a note-taking app focused on user privacy & ease of use. Prior to 3.3.9, a Stored Cross-Site Scripting (XSS) vulnerability existed in Notesnook's editor embed component when rendering Twitter/X embed URLs. The tweetToEmbed() function in component.tsx interpolated the user-supplied URL directly into an HTML string without escaping, which was then assigned to the srcdoc attribute of an <iframe>. This vulnerability is fixed in 3.3.9.

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:b43fdeb22138629c1c14bc05a9a2150227d21d536b14f0247869db36a5f680db

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"product":"notesnook","vendor":"streetwriters","versions":[{"status":"affected","version":"< 3.3.9"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:7393a8b66c5a24d320b7dfd5dbeb23e3bfe82057b9e85235c82881e61c701a51 · sha256:8e859e3415ab50ad… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.4,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/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:v2:7393a8b66c5a24d320b7dfd5dbeb23e3bfe82057b9e85235c82881e61c701a51 · sha256:8e859e3415ab50ad… · /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:v2:7393a8b66c5a24d320b7dfd5dbeb23e3bfe82057b9e85235c82881e61c701a51 · sha256:8e859e3415ab50ad… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions

{"name":"https://github.com/streetwriters/notesnook/commit/e87f5e5f899f45df28d7c0f33f15e9178d1fbcb7","tags":["x_refsource_MISC"],"url":"https://github.com/streetwriters/notesnook/commit/e87f5e5f899f45df28d7c0f33f15e9178d1fbcb7"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:7393a8b66c5a24d320b7dfd5dbeb23e3bfe82057b9e85235c82881e61c701a51 · sha256:8e859e3415ab50ad… · /containers/cna/references/1

{"name":"https://github.com/streetwriters/notesnook/security/advisories/GHSA-jprx-2w2h-4rh5","tags":["x_refsource_CONFIRM"],"url":"https://github.com/streetwriters/notesnook/security/advisories/GHSA-jprx-2w2h-4rh5"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:7393a8b66c5a24d320b7dfd5dbeb23e3bfe82057b9e85235c82881e61c701a51 · sha256:8e859e3415ab50ad… · /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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