Security readout for executives and security teams
Plain-English summary
CVE-2026-3658 affects the Simply Schedule Appointments WordPress booking plugin. Sites running versions up to 1.6.10.0 may allow unauthenticated attackers to read sensitive database data through SQL injection, including usernames, emails, and password hashes. This is a data-confidentiality risk for public WordPress sites using the plugin.
Executive priority
Prioritize remediation for public websites using this booking plugin, especially sites storing customer or account data. Treat as a near-term patch or disable decision, not a routine backlog item.
Technical view
The flaw is CWE-89 SQL injection in the plugin’s handling of the user-controlled 'fields' parameter. The CVSS 3.1 score is 7.5, with network access, low complexity, no privileges, and no user interaction required. Sources cite insufficient escaping and insufficient SQL query preparation, enabling appended SQL to extract database information.
Likely exposure
Internet-facing WordPress sites with Appointment Booking Calendar / Simply Schedule Appointments installed at versions up to and including 1.6.10.0 are the likely exposed population.
Exploitation context
The source bundle does not show CISA KEV listing or cited active exploitation. The issue is still serious because it is unauthenticated, remotely reachable, and targets database confidentiality.
Researcher notes
Wordfence and CVE describe unauthenticated SQL injection via 'fields'. WordPress Trac references identify relevant model/API code paths and a changeset. The provided sources do not establish active exploitation, a weaponized public exploit, or a named fixed release.
Mitigation direction
- Inventory WordPress sites for the Simply Schedule Appointments plugin.
- Upgrade the plugin to a version newer than 1.6.10.0 if available.
- If no fixed version is available, follow vendor guidance or temporarily disable the plugin.
- Restrict administrative access and monitor WordPress for suspicious database-related errors.
- Review exposed sites for possible credential or user-data disclosure.
Validation and detection
- Confirm installed plugin name and version on each WordPress site.
- Flag any installation at version 1.6.10.0 or older.
- Review vendor changelog and WordPress Trac changeset 3485143.
- Check logs for unusual requests involving the 'fields' parameter.
- Assess whether exposed database data requires credential resets or user notification workflows.
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-89: Database access and collection lookup
Injection into data stores can inform collection, data access, and exfiltration detection reviews. 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 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 lookupDatabase behavior lookup
The CVE wording references database injection or access, so collection and exfiltration review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-3658 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:L/PR:N/UI:N/S:U/C:H/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:H/I:N/A:N3.93.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.wordfence.com/threat-intel/vulnerabilities/id/67c7b9b2-e73f-47fe-aecc-14e998a607c8?source=cveCVE reference
- https://plugins.trac.wordpress.org/browser/simply-schedule-appointments/trunk/includes/lib/td-util/class-td-db-model.php#L1171CVE reference
- https://plugins.trac.wordpress.org/browser/simply-schedule-appointments/trunk/includes/lib/td-util/class-td-api-model.php#L140CVE reference
- https://plugins.trac.wordpress.org/browser/simply-schedule-appointments/trunk/includes/class-appointment-type-model.php#L907CVE reference
- https://plugins.trac.wordpress.org/changeset/3485143/CVE 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.
Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.