Security readout for executives and security teams
Plain-English summary
CVE-2022-4036 lets attackers bypass CAPTCHA protection in the WordPress Appointment Hour Booking plugin through version 1.3.72. The issue reduces trust in booking forms and can enable automated abuse, but the provided sources show limited confidentiality impact and no evidence of active exploitation.
Executive priority
Treat as a moderate web-exposure issue. It is not presented as actively exploited, but public booking workflows can be abused at scale, so remediation should be scheduled promptly for affected WordPress sites.
Technical view
The plugin used an insufficiently strong hash for the CAPTCHA secret and exposed that secret to users in a cookie. The CVSS 3.1 score is 5.3: network reachable, low complexity, no privileges, no user interaction, with low confidentiality impact and no integrity or availability impact.
Likely exposure
Exposure is likely limited to public WordPress sites running Appointment Hour Booking – Booking Calendar version 1.3.72 or earlier, especially where CAPTCHA is relied on to control booking-form abuse.
Exploitation context
The source bundle does not show CISA KEV listing or cited active exploitation. The issue is still practical for unauthenticated remote abuse because the attack complexity is low and booking forms are commonly public.
Researcher notes
The key evidence is Wordfence’s advisory and the CVE description. The bundle does not provide exploit status beyond non-KEV status. Avoid assuming broader WordPress or CAPTCHA impacts outside this specific plugin and affected version range.
Mitigation direction
- Inventory WordPress sites using Appointment Hour Booking.
- Upgrade the plugin to a version newer than 1.3.72 if available.
- Check Wordfence and WordPress plugin guidance for current fixed versions.
- Disable or restrict exposed booking forms until vulnerable instances are updated.
- Monitor booking submissions for spam, scraping, or suspicious automation.
Validation and detection
- Confirm installed plugin versions across WordPress environments.
- Flag any Appointment Hour Booking version 1.3.72 or earlier.
- Review public booking pages that rely on plugin CAPTCHA controls.
- Check web logs for unusual unauthenticated booking-form activity.
- Verify remediation by confirming the updated plugin version.
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
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CWE-804: Exact CWE lookup
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Open ATT&CK lookupCredential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2022-4036 mapping review
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Open ATT&CK lookup- Severity
- Medium
- CVSS
- 5.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/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:L/PR:N/UI:N/S:U/C:L/I:N/A:N3.91.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.wordfence.com/threat-intel/vulnerabilities/id/f62d28bd-fa33-4f0b-a116-5aacc05bfa3a?source=cveCVE reference
- https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=2803896%40appointment-hour-booking&new=2803896%40appointment-hour-booking&sfp_email=&sfph_mail=CVE reference
- https://www.wordfence.com/vulnerability-advisories-continued/#CVE-2022-4036CVE reference
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.
Guessable CAPTCHA
Guessable CAPTCHA represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.