Simple 301 Redirects 2.0.0 — 2.0.3 - Authenticated Arbitrary Plugin Activation
CVE-2021-24356Published · Updated Action summary
Affected: 2.0.0 – 2.0.3Update to 2.0.4 or newer
All remediation steps- Severity
- High8.8
- CVSS
- 8.8CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HWhat does this vector mean?
AV:NAttack vector- Network
AC:LAttack complexity- Low
PR:LPrivileges required- Low
UI:NUser interaction- None
S:UScope- Unchanged
C:HConfidentiality- High
I:HIntegrity- High
A:HAvailability- High
- Weakness
- CWE-862 Missing Authorization
- Required access
- Unknown
- Exploit prediction (EPSS)
- No score
- CISA KEV
- Not listed
On this page8
Am I affected?
Simple 301 Redirects by BetterLinks – Easy Redirect Manager simple-301-redirects
- Affected2.0.0 – 2.0.3
- Patched in2.0.4
Update to 2.0.4 or newer.
You are affected if you run 2.0.0 – 2.0.3. Version 2.0.4 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Simple 301 Redirects by BetterLinks – Easy Redirect Manager.
- No admin access? Run a passive check of your site. It reads public files only.
What to do
- Update to version 2.0.4, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch Simple 301 Redirects by BetterLinks – Easy Redirect Manager to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to Chloe Chamberland.
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.
Exploits & references
Proof-of-concept & detection
No public proof-of-concept or detection template is known for this vulnerability.
Advisories & patches
- Advisorywordfence.com
Related CVEs
More in Simple 301 Redirects by BetterLinks – Easy Redirect Manager
All 7| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| Medium4.3 | Missing Authorization via clicked ≤2.0.7Update to 2.0.8 | CVE-2023-47761 | |
| Medium5.4 | Cross-Site Request Forgery via 'clicked' <2.0.8Update to 2.0.8 | — | |
| Medium4.3 | 2.0.3 - Authenticated Wildcard Activation and Retrieval 2.0.0 – 2.0.3Update to 2.0.4 | CVE-2021-24355 | |
| High8.8 | 2.0.3 - Unauthenticated Redirect Import 2.0.0 – 2.0.3Update to 2.0.4 | CVE-2021-24353 | |
| High8.8 | 2.0.3 - Authenticated Arbitrary Plugin Installation 2.0.0 – 2.0.3Update to 2.0.4 | CVE-2021-24354 |
- Medium4.3Missing Authorization via clicked
≤2.0.7Update to 2.0.8
- Medium5.4Cross-Site Request Forgery via 'clicked'
<2.0.8Update to 2.0.8
- Medium4.32.0.3 - Authenticated Wildcard Activation and Retrieval
2.0.0 – 2.0.3Update to 2.0.4
- High8.82.0.3 - Unauthenticated Redirect Import
2.0.0 – 2.0.3Update to 2.0.4
- High8.82.0.3 - Authenticated Arbitrary Plugin Installation
2.0.0 – 2.0.3Update to 2.0.4
Same weakness (Missing Authorization)
All Missing Authorization| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| High7.2 | Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header | CVE-2026-120688 | |
| Critical9.8 | Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission | CVE-2026-125055 | |
| Critical9.8 | Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter | CVE-2026-119077 | |
| Medium5.3 | Unauthenticated Sensitive Information Exposure in 'search' Parameter | CVE-2026-121518 |
- High7.2Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header
EZ SQL Reports Shortcode Widget and DB Backup
≤5.25.25Update to 5.26.45
- Critical9.8Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission
Chatterbug Forms – Fast, Flexible WordPress Form Builder
≤1.0.2Update to 1.1
- Critical9.8Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter
ELEX WordPress HelpDesk & Customer Ticketing System
≤3.3.9Update to 3.4.0
- Medium5.3Unauthenticated Sensitive Information Exposure in 'search' Parameter
Customer Reviews for WooCommerce
≤5.127.0Update to 5.128.0
Timeline
CVE published
Severity high, CVSS 8.8
Record last updated
Sources & licenses
Wordfence record- Vulnerability data
- Wordfence Intelligence. Copyright 2012-2026 Defiant Inc. Licensed under the CC BY-SA 4.0.
- CVE® identifiers
- Copyright 1999-2026 The MITRE Corporation. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
- CVSS / CWE
- National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
- VulnCrest content
- Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.