Simple 301 Redirects by BetterLinks - 2.0.0 – 2.0.3 - Arbitrary Plugin Activation

published 2021-06-14 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-11269

cvss: 8.8; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 2.6%; EPSS 2.6% chance of exploitation in 30 days, percentile 85%
public exploits: 0; none known

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.

Patch / fix

fixed in 1

wpdeveloper simple_301_redirects 2.0.4

Exploit prediction

2.60% chance of exploitation in the next 30 days, higher than 85% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

wordfence.com https://www.wordfence.com/blog/2021/05/severe-vulnerabilities-patched-in-simple-301-redirects-by-betterlinks-plugin/ referenced PoC, tagged "exploit" by a source, unverified
wpscan.com https://wpscan.com/vulnerability/be356530-5e00-4f27-8177-b80f3c1ae6e8 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	6.5	AV:N/AC:L/Au:S/C:P/I:P/A:P

Affected products

Unknown Simple 301 Redirects by BetterLinks

Classification

Weakness

CWE-862 Missing Authorization

Technology feeds

WordPress rss critical rss

References

wordfence.com /blog/2021/05/severe-vulnerabilities-patched-in-simple-301-redirects-by-betterlinks-plugin/
exploit, third-party-advisory
wpscan.com /vulnerability/be356530-5e00-4f27-8177-b80f3c1ae6e8
exploit, third-party-advisory

Sources

CVE List CVE-2021-24356
NVD CVE-2021-24356

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.

Summary