ICS Calendar <= 12.1.1 - Unauthenticated Stored Cross-Site Scripting
ICS Calendar has a cross-site scripting issue. Unsafe script can run in another user's browser if the vulnerable feature is used.
Quick answer
ICS Calendar should be reviewed and updated if it matches the affected versions. The recommended fix is to apply the vendor-supported patched version or the mitigation steps below, then retest the public website with Fixnx.
Who is affected
Affected versions
- ICS Calendar up to and including 12.1.1
Fixed versions
- ICS Calendar 12.1.1.1 or later
How to fix it
Update ICS Calendar. The old version can let unsafe script run in a user or admin browser.
- Back up the site and database.
- Update ICS Calendar to ICS Calendar 12.1.1.1 or later.
- Clear all site and plugin caches.
- Review recent posts, settings, forms, and widgets for unknown script.
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Verify the fix
- Confirm the installed version is ICS Calendar 12.1.1.1 or later.
- Test the affected feature and confirm script input is blocked or cleaned.
Related categories
Trusted references
FAQ
What is affected by CVE-2026-59516?
ICS Calendar versions listed as affected should be reviewed: ICS Calendar up to and including 12.1.1.
What should I fix first?
Start with internet-facing sites, admin panels, login flows, plugins, themes, modules, packages, and systems that process user-controlled input or sensitive data.
How do I confirm the fix worked?
Apply the patched version or mitigation, clear caches where relevant, retest the affected workflow, and run a new Fixnx scan to verify public website exposure signals.
How are Fixnx security risk categories chosen?
Fixnx keeps one canonical risk page and assigns only broad, relevant categories such as ecosystem, technology area, or vulnerability class.