Calendar <= 1.3.16 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'event_desc'
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.
Summary
The Calendar plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'event_desc' parameter in all versions up to, and including, 1.3.16 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page, granted they can convince an administrator to enable lower privilege users to manage calendar events via the plugin settings.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| kieranoshea | Calendar | up to 1.3.16 | — | No fix listed | CNA |
- Calendar Vendorkieranoshea Affected up to 1.3.16 Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2025-14548
- 2026-10-03 Alias added: GHSA-hj2f-hxvq-38r7
References
Other 4
- https://www.wordfence.com/threat-intel/vulnerabilities/id/2e61489d-a433-4d44-bb12-8c84204922b9?source=cve
- https://plugins.trac.wordpress.org/browser/calendar/trunk/calendar.php#L2154
- https://plugins.trac.wordpress.org/browser/calendar/trunk/calendar.php#L899
- https://plugins.trac.wordpress.org/changeset?new=3419088%40calendar%2Ftrunk&old=3122280%40calendar%2Ftrunk
More kieranoshea vulnerabilities
- TI-2025-11903 Donation <= 1.0 - Admin+ SQLi CVSS 3.1MEDIUM 4.1
- TI-2024-02641 Calendar <= 1.3.14 - Authenticated (Contributor+) SQL Injection via Shortcode CVSS 3.1HIGH 8.8
- TI-2013-02359 Cross-site request forgery (CSRF) vulnerability in the Calendar plugin before 1.3.3 for… CVSS 2.0MEDIUM 6.8
- TI-2018-13371 The Kieran O'Shea Calendar plugin before 1.3.11 for WordPress has Stored XSS via the… CVSS 3.0MEDIUM 5.4
Sources
- CVE-2025-14548 · CVE Program
- CVE-2025-14548 · NVD
- FIRST EPSS
- GHSA-hj2f-hxvq-38r7 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences