How severe is CVE-2026-3884?

CVE-2026-3884 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-3884 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-3884?

CVE-2026-3884 affects Spin.js. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-3884?

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

Does CVE-2026-3884 have an EU (EUVD) identifier?

Yes. CVE-2026-3884 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-11105.

When was CVE-2026-3884 published?

CVE-2026-3884 was published on 2026-03-11 and last updated on 2026-06-17.

CVE-2026-3884

CVE-2026-3884 is a medium-severity vulnerability in Spin.js with a CVSS 3.x base score of 6.1. 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 6.1)
CVSS v4: 2.0
EPSS exploit prediction: 0% (5th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-11105
Weakness: CWE-79
Affected product: Spin.js
Published: 2026-03-11
Last modified: 2026-06-17

Description

Versions of the package spin.js before 3.0.0 are vulnerable to Cross-site Scripting (XSS) via the spin() function that allows a creation of more than 1 alert for each 'target' element. An attacker would need to set an arbitrary key-value pair on Object.prototype through a crafted URL achieving a prototype pollution first, before being able to execute arbitrary JavaScript in the context of the user's browser.

Frequently asked questions

What is CVE-2026-3884?: Versions of the package spin.js before 3.0.0 are vulnerable to Cross-site Scripting (XSS) via the spin() function that allows a creation of more than 1 alert for each 'target' element. An attacker would need to set an arbitrary key-value pair on Object.prototype through a crafted URL achieving a prototype pollution first, before being able to execute arbitrary JavaScript in the context of the user's browser.
How severe is CVE-2026-3884?: CVE-2026-3884 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-3884 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-3884?: CVE-2026-3884 affects Spin.js. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-3884?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-3884 have an EU (EUVD) identifier?: Yes. CVE-2026-3884 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-11105.
When was CVE-2026-3884 published?: CVE-2026-3884 was published on 2026-03-11 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:spin.js:spin.js:*:*:*:*:*:node.js:*:*

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