Security readout for executives and security teams
Plain-English summary
This vulnerability affects older Kieran O'Shea Calendar WordPress plugin installations. A user able to create calendar events or categories in wp-admin could store malicious script content in event titles or category names, causing it to run later in an administrator's browser.
Executive priority
Treat this as a cleanup and exposure-reduction item rather than an emergency based on the provided evidence. Prioritize affected public WordPress properties and sites with many admin or editor users.
Technical view
CVE-2018-18872 is stored cross-site scripting in the Kieran O'Shea Calendar plugin before 1.3.11 for WordPress. Reported inputs are event_title during calendar add actions and category name during calendar category creation. The bundle provides no CVSS, CWE, or detailed privilege requirements.
Likely exposure
Exposure is likely limited to WordPress sites running the Kieran O'Shea Calendar plugin before version 1.3.11, especially where multiple users can access wp-admin calendar or category creation features.
Exploitation context
The source bundle does not show CISA KEV listing or other evidence of active exploitation. Exploitation appears to require access to plugin administrative workflows, but exact required role and permissions are not stated in the provided sources.
Researcher notes
Evidence is sparse: no CVSS, CWE, exploit status, or role requirement is provided. Validation should focus on installed plugin versions, reachable wp-admin workflows, and whether untrusted users can create affected calendar records.
Mitigation direction
- Inventory WordPress sites for the Kieran O'Shea Calendar plugin and installed version.
- Update to 1.3.11 or later if vendor guidance confirms that version is available.
- If updates are unavailable, disable or replace the plugin after business review.
- Restrict wp-admin access and plugin management permissions to trusted users.
- Review vendor or WordPress security guidance for any additional remediation details.
Validation and detection
- Confirm whether any site runs the plugin below version 1.3.11.
- Check calendar event titles and category names for unexpected script-like content.
- Review WordPress user roles with access to calendar event or category creation.
- Verify the plugin is updated, disabled, or removed on affected sites.
- Monitor administrative pages for unusual browser alerts or content rendering issues.
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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CVE-2018-18872 mapping review
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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://wpvulndb.com/vulnerabilities/9141CVE reference · x_refsource_MISC
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.