CVE-2021-23439

CVE-2021-23439 is a medium-severity vulnerability in Johndatserakis File-upload-with-preview with a CVSS 3.x base score of 4.2. 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

Description

This affects the package file-upload-with-preview before 4.2.0. A file containing malicious JavaScript code in the name can be uploaded (a user needs to be tricked into uploading such a file).

Frequently asked questions

What is CVE-2021-23439?
This affects the package file-upload-with-preview before 4.2.0. A file containing malicious JavaScript code in the name can be uploaded (a user needs to be tricked into uploading such a file).
How severe is CVE-2021-23439?
CVE-2021-23439 has a CVSS 3.x base score of 4.2, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-23439 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-23439?
CVE-2021-23439 affects Johndatserakis File-upload-with-preview. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-23439?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-23439 published?
CVE-2021-23439 was published on 2021-09-05 and last updated on 2026-06-17.

References

Affected products (1)

Other CWE-79 (Cross-site Scripting (XSS)) vulnerabilities

Browse all CWE-79 (Cross-site Scripting (XSS)) vulnerabilities →