My Calendar – Accessible Event Manager <= 3.7.3 — Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode Attributes
CVE-2026-2355Published · Updated Action summary
Affected: ≤3.7.3Update to 3.7.4 or newer
All remediation steps- Severity
- Medium6.4
- CVSS
- 6.4CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:NWhat does this vector mean?
AV:NAttack vector- Network
AC:LAttack complexity- Low
PR:LPrivileges required- Low
UI:NUser interaction- None
S:CScope- Changed
C:LConfidentiality- Low
I:LIntegrity- Low
A:NAvailability- None
- Weakness
- CWE-79 Cross-Site Scripting
- Required access
- Unknown
- Exploit prediction (EPSS)
- No score
- CISA KEV
- Not listed
On this page8
Am I affected?
My Calendar – Accessible Event Manager my-calendar
- Affected≤ 3.7.3
- Patched in3.7.4
Update to 3.7.4 or newer.
You are affected if you run ≤ 3.7.3. Version 3.7.4 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under My Calendar – Accessible Event Manager.
- No admin access? Run a passive check of your site. It reads public files only.
What to do
- Update to version 3.7.4, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch My Calendar – Accessible Event Manager to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to Muhammad Yudha - DJ.
The My Calendar – Accessible Event Manager plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the `template` attribute of the `[my_calendar_upcoming]` shortcode in all versions up to, and including, 3.7.3. This is due to the use of `stripcslashes()` on user-supplied shortcode attribute values in the `mc_draw_template()` function, which decodes C-style hex escape sequences (e.g., `\x3c` to `<`) at render time, bypassing WordPress's `wp_kses_post()` content sanitization that runs at save time. 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.
Exploits & references
Proof-of-concept & detection
No public proof-of-concept or detection template is known for this vulnerability.
Advisories & patches
- Advisorywordfence.com
Related CVEs
More in My Calendar – Accessible Event Manager
All 24| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| Medium6.5 | 3.8.11 - Unauthenticated Arbitrary Shortcode Execution 3.8.8 – <3.8.11Update to 3.8.11 | CVE-2026-119714 | |
| Critical9.8 | Unauthenticated Privilege Escalation to 'mcs' Parameter via Reflected Shortcode Injection into 'above' Attribute ≤3.8.7Update to 3.4.25 or 3.5.22 or 3.6.18 or 3.7.18 or 3.8.8 | CVE-2026-104798 | |
| Medium6.4 | Authenticated (Contributor+) Stored Cross-Site Scripting via 'fallback' Shortcode Attribute ≤3.8.3Update to 3.8.4 | CVE-2026-77186 | |
| Medium6.4 | Authenticated (Contributor+) Stored Cross-Site Scripting via 'before' and 'after' Shortcode Attributes ≤3.8.3Update to 3.8.4 | CVE-2026-77187 | |
| High7.5 | Unauthenticated SQL Injection via 'mc_auth' and 'mc_host' Parameters ≤3.7.8Update to 3.7.9 | CVE-2026-6854 |
- Medium6.53.8.11 - Unauthenticated Arbitrary Shortcode Execution
3.8.8 – <3.8.11Update to 3.8.11
- Critical9.8Unauthenticated Privilege Escalation to 'mcs' Parameter via Reflected Shortcode Injection into 'above' Attribute
≤3.8.7Update to 3.4.25 or 3.5.22 or 3.6.18 or 3.7.18 or 3.8.8
- Medium6.4Authenticated (Contributor+) Stored Cross-Site Scripting via 'fallback' Shortcode Attribute
≤3.8.3Update to 3.8.4
- Medium6.4Authenticated (Contributor+) Stored Cross-Site Scripting via 'before' and 'after' Shortcode Attributes
≤3.8.3Update to 3.8.4
- High7.5Unauthenticated SQL Injection via 'mc_auth' and 'mc_host' Parameters
≤3.7.8Update to 3.7.9
Same weakness (Cross-Site Scripting)
All Cross-Site Scripting| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| High7.2 | Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header | CVE-2026-120688 | |
| Critical9.8 | Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission | CVE-2026-125055 | |
| Critical9.8 | Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter | CVE-2026-119077 | |
| Medium5.3 | Unauthenticated Sensitive Information Exposure in 'search' Parameter | CVE-2026-121518 |
- High7.2Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header
EZ SQL Reports Shortcode Widget and DB Backup
≤5.25.25Update to 5.26.45
- Critical9.8Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission
Chatterbug Forms – Fast, Flexible WordPress Form Builder
≤1.0.2Update to 1.1
- Critical9.8Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter
ELEX WordPress HelpDesk & Customer Ticketing System
≤3.3.9Update to 3.4.0
- Medium5.3Unauthenticated Sensitive Information Exposure in 'search' Parameter
Customer Reviews for WooCommerce
≤5.127.0Update to 5.128.0
Timeline
CVE published
Severity medium, CVSS 6.4
Record last updated
Sources & licenses
Wordfence record- Vulnerability data
- Wordfence Intelligence. Copyright 2012-2026 Defiant Inc. Licensed under the CC BY-SA 4.0.
- CVE® identifiers
- Copyright 1999-2026 The MITRE Corporation. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
- CVSS / CWE
- National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
- VulnCrest content
- Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.