Security readout for executives and security teams
Plain-English summary
CVE-2026-1987 affects the WordPress Scheduler Widget plugin through version 0.1.6. Any logged-in user with Subscriber-level access or higher could modify scheduler events they do not own if they know the event ID. This is mainly an integrity and availability risk for sites relying on scheduled events.
Executive priority
Treat as a moderate-priority WordPress plugin issue. Prioritize sites where public registration, many subscriber accounts, or customer-facing scheduling workflows exist. It is less urgent than unauthenticated remote code execution, but it can undermine trust in published scheduling data.
Technical view
The plugin’s event update handler, identified as scheduler_widget_ajax_save_event(), lacks proper authorization and ownership checks. The issue is an IDOR/CWE-639 pattern, with related missing authorization concerns. The CVSS 3.1 score is 5.4, requiring network access and low privileges, with no user interaction.
Likely exposure
Exposure is limited to WordPress sites running Scheduler Widget up to and including 0.1.6, where untrusted or broadly assigned subscriber accounts exist. Public sources do not identify broader platform impact.
Exploitation context
The source bundle does not show CISA KEV listing or cited evidence of active exploitation. Exploitation requires authenticated access and knowledge of an event ID, but no user interaction is required once authenticated.
Researcher notes
Sources identify an IDOR in the event save AJAX function using an id parameter without ownership verification. No patch version is named in the provided material. Avoid assuming exploit availability beyond the documented authenticated modification condition.
Mitigation direction
- Inventory WordPress sites for Scheduler Widget installations and versions.
- Restrict subscriber or low-privilege account creation where not required.
- Review vendor and WordPress plugin guidance for an updated or corrected release.
- Disable the plugin if event integrity is business-critical and no fix is available.
- Monitor scheduler event changes for unexpected edits by low-privilege users.
Validation and detection
- Confirm whether Scheduler Widget is installed and at version 0.1.6 or earlier.
- Review plugin code or vendor notes for authorization checks on event updates.
- Check logs for event modifications by subscriber-level or unexpected accounts.
- Verify whether business processes rely on scheduler event accuracy.
- Track the CVE and vendor pages for remediation updates.
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-639: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. 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-2026-1987 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:L/UI:N/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:L/UI:N/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:L/UI:N/S:U/C:N/I:L/A:L
Source materials
- CVE List V5 sourceCVE List V5
- https://www.wordfence.com/threat-intel/vulnerabilities/id/fd5f370c-743f-41f1-80ab-7f0805cae38c?source=cveCVE reference
- https://plugins.trac.wordpress.org/browser/scheduler-widget/trunk/scheduler-widget.php#L158CVE reference
- https://plugins.trac.wordpress.org/browser/scheduler-widget/tags/0.1.6/scheduler-widget.php#L158CVE reference
- https://owasp.org/www-project-web-security-testing-guide/latest/4-Web_Application_Security_Testing/05-Authorization_Testing/04-Testing_for_Insecure_Direct_Object_ReferencesCVE reference
- https://cwe.mitre.org/data/definitions/639.htmlCVE reference
- https://cwe.mitre.org/data/definitions/862.htmlCVE 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.
Authorization Bypass Through User-Controlled Key
Authorization Bypass Through User-Controlled Key represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.