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Fencer Vulns
high 8.1

CVE-2021-23394 in the critical feed json

Remote Code Execution (RCE)

published 2021-06-13 5 y ago modified 2026-07-08 4 mo ago also GHSA-qm58-cvvm-c5qr , EUVD-2021-1383

cvss
8.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
18.9%
EPSS 18.9% chance of exploitation in 30 days, percentile 97%
public exploits
0
none known, plus a Nuclei check

Summary

The package studio-42/elfinder before 2.1.58 are vulnerable to Remote Code Execution (RCE) via execution of PHP code in a .phar file. NOTE: This only applies if the server parses .phar files as PHP.

Patch / fix

  • packagist studio-42/elfinder 2.1.58
  • n/a studio-42/elfinder 2.1.58

Exploit prediction

18.93% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • Nuclei template elFinder < 2.1.58 - Remote Code Execution nuclei detection template
  • github.com https://github.com/Studio-42/elFinder/issues/3295 referenced PoC, tagged "exploit" by a source, unverified
  • blog.sonarsource.com https://blog.sonarsource.com/elfinder-case-study-of-web-file-manager-vulnerabilities/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
packagist studio-42/elfinder
<2.1.58
2.1.58

Affected products

  • n/a studio-42/elfinder

Classification

Weakness
  • CWE-434 Unrestricted Upload of File with Dangerous Type

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.