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Fencer Vulns
medium 4.2

CVE-2021-23562 json

Arbitrary File Upload

published 2021-12-03 4 y ago modified 2026-06-17 4 mo ago also GHSA-rp2c-jrgp-cvr8 , EUVD-2021-2581

cvss
4.2
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.0%
EPSS 1.0% chance of exploitation in 30 days, percentile 63%
public exploits
0
none known

Summary

This affects the package plupload before 2.3.9. A file name containing JavaScript code could be uploaded and run. An attacker would need to trick a user to upload this kind of file.

Patch / fix

  • npm plupload 2.3.9
  • n/a plupload 2.3.9

Exploit prediction

1.03% chance of exploitation in the next 30 days, higher than 63% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 4.2 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
NVD 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P
GitHub 3.1 4.2 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
npm plupload
<2.3.9
2.3.9

Affected products

  • n/a plupload

Classification

Weakness
  • CWE-434 Unrestricted Upload of File with Dangerous Type
  • CWE-75 Failure to Sanitize Special Elements into a Different Plane

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.