My Calendar < 3.2.18 - Subscriber+ Reflected Cross-Site Scripting
Priority LOW 25CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-79.
Summary
The My Calendar WordPress plugin before 3.2.18 does not sanitise and escape the callback parameter of the mc_post_lookup AJAX action (available to any authenticated user) before outputting it back in the response, leading to a Reflected Cross-Site Scripting issue
Why it matters now
EPSS 0.0062 49th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed My Calendar (Unknown): 3.2.18
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Unknown | My Calendar | 3.2.18 to before 3.2.18 | 3.2.18 | Patch available | CNA |
- My Calendar VendorUnknown Affected 3.2.18 to before 3.2.18 Fixed in 3.2.18 Patch available CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:my_calendar_project:my_calendar:*:*:*:*:*:wordpress:*:* | before 3.2.18 | Vulnerable | My Calendar Project |
- cpe:2.3:a:my_calendar_project:my_calendar:*:*:*:*:*:wordpress:*:* Versions before 3.2.18 Vulnerable ·My Calendar Project
Remediation
- Fix · CNA My Calendar (Unknown) Fixed in 3.2.18
Timeline
- 2026-10-02 Threatist record created from CVE-2021-24927
- 2026-10-03 Alias added: GHSA-gcvg-gpgp-f6cf
References
More My Calendar Project My Calendar vulnerabilities
- TI-2023-09612 WordPress My Calendar Plugin <= 3.4.3 is vulnerable to Cross Site Request Forgery (CSRF) CVSS 3.1HIGH 8.8
- TI-2022-23504 WordPress My Calendar Plugin <= 3.3.24.1 is vulnerable to Cross Site Request Forgery (CSRF) CVSS 3.1HIGH 8.8
- TI-2019-11795 The my-calendar plugin before 3.1.10 for WordPress has XSS. CVSS 3.0MEDIUM 6.1
Sources
- CVE-2021-24927 · CVE Program
- CVE-2021-24927 · NVD
- FIRST EPSS
- GHSA-gcvg-gpgp-f6cf · 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