Security readout for executives and security teams
Plain-English summary
CVE-2021-36854 affects the Booking Ultra Pro WordPress plugin version 1.1.4 and earlier. It is a CSRF issue, meaning a logged-in WordPress user could be tricked into causing unwanted plugin actions. The rated impact is medium, with limited integrity and availability impact and no cited confidentiality impact.
Executive priority
Treat as a targeted WordPress plugin risk, not an emergency internet-wide crisis. Prioritize affected public-facing booking sites, especially those with active administrators, because successful CSRF could alter site or booking-related state.
Technical view
The CVE describes multiple CWE-352 cross-site request forgery vulnerabilities in Booking Ultra Pro for WordPress <= 1.1.4. CVSS 3.1 is 5.4: network reachable, low complexity, no attacker privileges, user interaction required, unchanged scope, no confidentiality impact, and low integrity/availability impact.
Likely exposure
Exposure is limited to WordPress sites running Booking Ultra Pro plugin version 1.1.4 or earlier. The source bundle provides no CPEs, no install-base detail, and no confirmed affected configurations beyond the plugin version condition.
Exploitation context
The bundle does not cite active exploitation, and the CVE is not listed as KEV. Practical abuse requires user interaction, likely involving a logged-in WordPress user being induced to trigger unintended state-changing actions.
Researcher notes
Evidence is limited to the CVE description, CVSS vector, CWE, Patchstack reference, and WordPress plugin reference. The bundle does not include endpoint details, proof of concept, fixed version, vendor advisory text, or exploitation evidence.
Mitigation direction
- Inventory WordPress sites for Booking Ultra Pro installations.
- Flag any Booking Ultra Pro version 1.1.4 or earlier.
- Check Patchstack and WordPress plugin guidance for available vendor remediation.
- Disable or remove the affected plugin where operationally acceptable until remediated.
- Limit privileged WordPress sessions and booking-management access.
Validation and detection
- Confirm installed Booking Ultra Pro versions from WordPress plugin inventory.
- Compare findings against the affected range: version 1.1.4 or earlier.
- Review WordPress audit records for unexpected plugin or booking changes.
- Assess whether privileged users are exposed to untrusted links or email workflows.
- Track the CVE, Patchstack, and plugin page for updated remediation details.
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-352: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. 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-2021-36854 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
- Medium
- CVSS
- 5.4 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
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:R/S:U/C:N/I:L/A:L2.82.5Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.4MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
Source materials
- CVE List V5 sourceCVE List V5
- https://patchstack.com/database/vulnerability/booking-ultra-pro/wordpress-booking-ultra-pro-plugin-1-1-4-multiple-cross-site-request-forgery-csrf-vulnerabilities?_s_id=cveCVE reference · x_refsource_CONFIRM
- https://wordpress.org/plugins/booking-ultra-pro/CVE 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.
Cross-Site Request Forgery (CSRF)
Cross-Site Request Forgery (CSRF) represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.