CVE-2026-3367 json
Lockme OAuth2 calendars integration <= 2.11.0 - Authenticated (Administrator+) Stored Cross-Site Scripting via 'App ID' Setting
published 2026-07-11 3 mo ago modified 2026-07-13 3 mo ago also EUVD-2026-43124
- cvss
- 4.4
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 35%
- public exploits
- 0
- none known
Summary
The Lockme OAuth2 calendars integration plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'App ID' setting in all versions up to, and including, 2.11.0. This is due to insufficient input sanitization and output escaping. The register_setting() call on line 197 lacks a sanitize callback, allowing unsanitized data to be stored via update_option(). When the settings page is rendered, the stored value is echoed directly into an HTML input's value attribute without esc_attr() on line 212. This makes it possible for authenticated attackers, with administrator-level access and above, to inject arbitrary web scripts in the settings page that will execute whenever a user accesses the plugin settings page. Multiple fields are affected: App ID (client_id), App Secret (client_secret), Bookings ID prefix (id_prefix), and API domain (api_domain). This vulnerability is particularly impactful in WordPress multisite installations where administrators of individual sites should not be able to execute JavaScript affecting other users.
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 3 mo ago
Exploit prediction
0.41% chance of exploitation in the next 30 days, higher than 35% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 4.4 | CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N |
Affected products
- lustmored Lockme calendars integration
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/800b1a44-4173-4b8e-bc69-9a64218e64d6?source=cve
- plugins.trac.wordpress.org /browser/lockme-calendars-integration/trunk/src/Plugin.php#L212
- plugins.trac.wordpress.org /browser/lockme-calendars-integration/tags/2.9.3/src/Plugin.php#L212
- plugins.trac.wordpress.org /browser/lockme-calendars-integration/trunk/src/Plugin.php#L223
- plugins.trac.wordpress.org /browser/lockme-calendars-integration/tags/2.9.3/src/Plugin.php#L223
- plugins.trac.wordpress.org /browser/lockme-calendars-integration/trunk/src/Plugin.php#L245
- plugins.trac.wordpress.org /browser/lockme-calendars-integration/tags/2.9.3/src/Plugin.php#L245
- plugins.trac.wordpress.org /browser/lockme-calendars-integration/trunk/src/Plugin.php#L256
- plugins.trac.wordpress.org /browser/lockme-calendars-integration/tags/2.9.3/src/Plugin.php#L256
- plugins.trac.wordpress.org /browser/lockme-calendars-integration/trunk/src/Plugin.php#L197
- plugins.trac.wordpress.org /browser/lockme-calendars-integration/tags/2.9.3/src/Plugin.php#L197
- plugins.trac.wordpress.org /browser/lockme-calendars-integration/trunk/src/Plugin.php#L54
- plugins.trac.wordpress.org /browser/lockme-calendars-integration/tags/2.9.3/src/Plugin.php#L54
- plugins.trac.wordpress.org /changeset?reponame=&old=3495564%40lockme-calendars-integration&new=3495564%40lockme-calendars-integration
Sources
- CVE List CVE-2026-3367
- NVD CVE-2026-3367
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.