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Fencer Intel
high 7.2

CVE-2021-39608 in the critical feed json

Remote Code Execution (RCE) vulnerabilty exists in FlatCore-CMS 2.0.7 via the upload addon plugin, which could let a remote malicious user…

published 5y ago modified 4mo ago also EUVD-2021-25965

cvss
7.2
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
45.9%
EPSS 45.9% chance of exploitation in 30 days, percentile 98%
public exploits
1
Exploit-DB

Summary

Remote Code Execution (RCE) vulnerabilty exists in FlatCore-CMS 2.0.7 via the upload addon plugin, which could let a remote malicious user exeuct arbitrary php code.

Is CVE-2021-39608 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Timeline

  1. Published
  2. First public exploit (EDB-50262)

Exploit prediction

45.95% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • EDB-50262 FlatCore CMS 2.0.7 - Remote Code Execution (RCE) (Authenticated) webapps, 2021-09-06
  • github.com https://github.com/flatCore/flatCore-CMS/issues/52 referenced PoC, tagged "exploit" by a source, unverified
  • packetstormsecurity.com http://packetstormsecurity.com/files/164047/FlatCore-CMS-2.0.7-Remote-Code-Execution.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 7.2 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 9.0 AV:N/AC:L/Au:S/C:C/I:C/A:C

Classification

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

References

Sources

Fencer Intel 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.