How severe is CVE-2026-31876?

CVE-2026-31876 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-31876 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-31876?

CVE-2026-31876 primarily affects Streetwriters Notesnook Desktop. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-31876?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-31876 have an EU (EUVD) identifier?

Yes. CVE-2026-31876 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-11286.

When was CVE-2026-31876 published?

CVE-2026-31876 was published on 2026-03-11 and last updated on 2026-06-17.

CVE-2026-31876

CVE-2026-31876 is a medium-severity vulnerability in Streetwriters Notesnook Desktop with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
EPSS exploit prediction: 0% (7th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-11286
Weakness: CWE-79
Affected product: Streetwriters Notesnook Desktop
Published: 2026-03-11
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-31876?: CVE-2026-31876 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-31876 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-31876?: CVE-2026-31876 primarily affects Streetwriters Notesnook Desktop. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-31876?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-31876 have an EU (EUVD) identifier?: Yes. CVE-2026-31876 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-11286.
When was CVE-2026-31876 published?: CVE-2026-31876 was published on 2026-03-11 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:streetwriters:notesnook_desktop:*:*:*:*:*:*:*:*
cpe:2.3:a:streetwriters:notesnook_mobile:*:*:*:*:*:android:*:*
cpe:2.3:a:streetwriters:notesnook_mobile:*:*:*:*:*:iphone_os:*:*

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