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Fencer Vulns
critical 9.8

CVE-2023-4521 in the critical feed json

Import XML and RSS Feeds < 2.1.5 - Unauthenticated RCE

published 2023-09-25 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-54376

cvss
9.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
40.8%
EPSS 40.8% chance of exploitation in 30 days, percentile 98%
public exploits
0
none known, plus a Nuclei check

Summary

The Import XML and RSS Feeds WordPress plugin before 2.1.5 contains a web shell, allowing unauthenticated attackers to perform RCE. The plugin/vendor was not compromised and the files are the result of running a PoC for a previously reported issue (https://wpscan.com/vulnerability/d4220025-2272-4d5f-9703-4b2ac4a51c42) and not deleting the created files when releasing the new version.

Patch / fix

  • Unknown Import XML and RSS Feeds 2.1.5

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
total
Assessed
18 mo ago

Exploit prediction

40.83% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • Nuclei template Import XML and RSS Feeds < 2.1.5 - Unauthenticated RCE nuclei detection template
  • wpscan.com https://wpscan.com/vulnerability/de2cdb38-3a9f-448e-b564-a798d1e93481 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

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

Affected products

  • Unknown Import XML and RSS Feeds

Classification

Technology feeds

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.