Security readout for executives and security teams
Plain-English summary
Simple 301 Redirects by BetterLinks before 2.0.4 allowed authenticated WordPress users to activate plugins already installed on the site. This could unexpectedly enable dormant functionality or vulnerable plugins. Business urgency depends on whether the plugin is deployed and whether untrusted users have accounts.
Executive priority
Treat as a near-term WordPress hygiene issue, not an emergency based on current evidence. Prioritize sites with public registration, many contributors, or dormant plugins that could increase impact if activated.
Technical view
The vulnerable AJAX action simple301redirects/admin/activate_plugin lacked proper capability checks and had insufficient nonce validation. Authenticated users could activate arbitrary installed plugins on affected Simple 301 Redirects by BetterLinks versions before 2.0.4. The source bundle does not provide CVSS, detailed role requirements, or proof of active exploitation.
Likely exposure
Exposure is limited to WordPress sites running Simple 301 Redirects by BetterLinks versions before 2.0.4, especially sites allowing low-trust authenticated users. Risk increases if sensitive or vulnerable plugins are installed but inactive.
Exploitation context
The provided sources describe authenticated exploitation of an AJAX action. CISA KEV status is false, and the bundle provides no cited evidence of active exploitation in the wild.
Researcher notes
Evidence supports CWE-862: missing authorization checks on a plugin activation AJAX path. The affected range is described as before 2.0.4, specifically 2.0.0 through 2.0.3 in the title. Severity metadata is incomplete, so impact assessment should be environment-specific.
Mitigation direction
- Upgrade Simple 301 Redirects by BetterLinks to version 2.0.4 or later.
- Review vendor and Wordfence guidance for any additional hardening advice.
- Remove unused inactive plugins from WordPress installations.
- Restrict or remove untrusted WordPress user accounts where possible.
Validation and detection
- Inventory WordPress sites for Simple 301 Redirects by BetterLinks installations.
- Confirm installed plugin versions are 2.0.4 or later.
- Review WordPress users with authenticated access, especially low-trust roles.
- Check recently activated plugins for unexpected changes.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-862: Authorization and privilege behavior lookup
Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-24356 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://www.wordfence.com/blog/2021/05/severe-vulnerabilities-patched-in-simple-301-redirects-by-betterlinks-plugin/CVE reference · x_refsource_MISC
- https://wpscan.com/vulnerability/be356530-5e00-4f27-8177-b80f3c1ae6e8CVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Missing Authorization
Missing Authorization represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.