Security readout for executives and security teams
Plain-English summary
This flaw let logged-in WordPress users install plugins through Simple 301 Redirects by BetterLinks when the site ran vulnerable versions. Arbitrary plugin installation can create a route to broader site compromise, especially where many users have accounts. The bundle does not show active exploitation or a CVSS score.
Executive priority
Prioritize remediation on public WordPress sites, especially portals with many user accounts. Treat vulnerable installations as a credible site-integrity risk, but avoid assuming active exploitation without further evidence.
Technical view
CVE-2021-24354 is a CWE-862 authorization failure in the plugin's AJAX handling. Before version 2.0.4, missing capability checks and an insufficient nonce check allowed authenticated users to install arbitrary plugins on vulnerable WordPress sites.
Likely exposure
Exposure is limited to WordPress sites running Simple 301 Redirects by BetterLinks versions 2.0.0 through 2.0.3, with at least one authenticated user account capable of reaching the vulnerable AJAX action.
Exploitation context
The provided sources state that authentication is required. They do not cite CISA KEV inclusion, public exploitation, or active exploitation in the wild. Risk is still meaningful because plugin installation can materially change site behavior and security posture.
Researcher notes
The source bundle identifies authorization and nonce weaknesses but does not include CVSS details, exploit telemetry, or a complete affected CPE record. Validate exposure by plugin version and authenticated-user model, then review plugin changes during the vulnerable period.
Mitigation direction
- Upgrade Simple 301 Redirects by BetterLinks to version 2.0.4 or later.
- Check the vendor and Wordfence guidance for any additional remediation notes.
- Review WordPress user accounts and remove unnecessary authenticated access.
- Audit recently installed plugins for unexpected or unauthorized additions.
Validation and detection
- Confirm the installed plugin version is 2.0.4 or later.
- Inventory sites running Simple 301 Redirects by BetterLinks.
- Review WordPress plugin installation history for suspicious changes.
- Verify only intended administrators can install plugins.
- Check logs for unusual authenticated activity around plugin management.
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-2021-24354 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/8638b36c-6641-491f-b9df-5db3645e4668CVE 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.