Security readout for executives and security teams
Plain-English summary
This affects WordPress sites using Qube One’s Redirection for Contact Form 7 plugin version 2.4.0 or older, but only when the AccessiBe extension is also present. An unauthenticated attacker could change plugin options and inject script content into footer HTML, creating confidentiality and integrity risk for site visitors.
Executive priority
Prioritize externally reachable WordPress sites that use this plugin combination. The issue is high severity, unauthenticated, and can affect visitor-facing content, but the evidence provided does not confirm active exploitation.
Technical view
CVE-2021-36913 is an unauthenticated options-change and content-injection issue in Redirection for Contact Form 7 <= 2.4.0. The provided record says exploitation requires the AccessiBe extension. CVSS 3.1 is 7.5, with network access, high complexity, no privileges, no user interaction, changed scope, high confidentiality impact, and low integrity impact.
Likely exposure
Exposure is likely limited to WordPress installations running Redirection for Contact Form 7 <= 2.4.0 with the AccessiBe extension installed. Sites without this plugin combination are not indicated as affected by the provided sources.
Exploitation context
The source bundle does not show CISA KEV listing or confirmed active exploitation. The described impact is unauthenticated configuration modification and footer script injection, which could affect visitor trust and data confidentiality if a vulnerable site is reachable.
Researcher notes
Do not generalize this to all Contact Form 7 deployments. The affected product is Qube One Redirection for Contact Form 7 <= 2.4.0, with AccessiBe required. The bundle does not provide exploit details, a named fixed version, or observed exploitation evidence.
Mitigation direction
- Inventory WordPress sites for Redirection for Contact Form 7 and AccessiBe.
- Upgrade beyond 2.4.0 only if vendor guidance confirms a fixed release.
- Disable or remove the vulnerable plugin combination if no fixed guidance is available.
- Review plugin options and footer HTML for unexpected script content.
- Check Patchstack and WordPress plugin guidance before restoring normal use.
Validation and detection
- Confirm installed Redirection for Contact Form 7 version on each WordPress site.
- Confirm whether the AccessiBe extension is installed or enabled.
- Review footer HTML output for unauthorized injected scripts.
- Review recent plugin option changes for unexplained modifications.
- Document whether each site is vulnerable, remediated, or not affected.
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-284: 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-2021-36913 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
- High
- CVSS
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N
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 vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N2.24.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N
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.
Improper Access Control
Improper Access Control represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.