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Public proof of conceptFix available

CVE-2021-24356

A public proof of concept exists; no exploitation attested.

  • Published2021-06-14
  • Fixed in2.0.4
  • WeaknessCWE-862

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

In the Simple 301 Redirects by BetterLinks WordPress plugin before 2.0.4, a lack of capability checks and insufficient nonce check on the AJAX action, simple301redirects/admin/activate_plugin, made it possible for authenticated users to activate arbitrary plugins installed on vulnerable sites.

Timeline

dates in UTC
  1. 2021-06-1414:15CVE publishedNVD

Versions per branch

NVD
Wpdeveloper simple 301 redirects
BranchAffectedFixed in
2.0≥ 2.0.0, < 2.0.42.0.4

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

  1. Update Wpdeveloper simple 301 redirects to 2.0.4

Detection

read 2026-11-01 01:02 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVSS 3.18.8read 2026-10-23
  • NVDCVSS 2.06.5read 2026-10-23
  • CNAweakness (CWE)CWE-862known since 2026-10-23
  • NVDweakness (CWE)CWE-862read 2026-10-23
  • FIRST EPSSEPSS score2.6 %2026-11-04
  • PoC-in-GitHubproof of concept1known since 2026-11-01

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
2021-06-14
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2021-24356?

In the Simple 301 Redirects by BetterLinks WordPress plugin before 2.0.4, a lack of capability checks and insufficient nonce check on the AJAX action, simple301redirects/admin/activate_plugin, made it possible for authenticated users to activate arbitrary plugins installed on vulnerable sites.

Is CVE-2021-24356 actively exploited?

Active exploitation of CVE-2021-24356 has not been confirmed. Its EPSS score was 2.6% on 2026-11-04, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-24356?

CVE-2021-24356 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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