Fullcalendar View security updates, in plain English

Fullcalendar View

23,814 sites report using it · on drupal.org · 1 security update explained here

This module provides a plugin that integrates a calendar view format powered by a JavaScript library.

Below is every security update for Fullcalendar View that this site has covered, newest first. Each one says who could exploit it, whether it applies to your site, how urgent it is, and what to tell your developer. If your site uses this module and you are not sure which version, that is the first question to ask whoever looks after it.

Fullcalendar View

Moderately critical · 23,814 sites report using it · SA-CONTRIB-2026-244 · on drupal.org · Week of 21 October 2026

The module allows a user to update fields on a piece of content without checking field level access. An ordinary account on the site could alter or add data to these fields. They could not view any hidden information.

Who could do thisOnly someone with a login on your site.
Does it apply to youAn attacker must have access to update the piece of content itself.
Has it been used in attacksNo sign of it.
How urgentDrupal rates this moderately critical. Include it in your next routine update, within the month.

Tell your developerUpdate Fullcalendar View to 5.2.6.

For developers: what the fix changed

The fix adds a check for field level edit access and field type in `src/Controller/CalendarEventController.php` by introducing a new `isWritableDateField` method. It also adds entity validation before saving.

5.2.5 to 5.2.6 1 commit, 1 file.

src/Controller/CalendarEventController.php +70 −0 fix

Full diff, 5.2.5 to 5.2.6

The comparison is against the release immediately before the fix. If your site is on an older release, more will have changed.

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If I can help, I'll say so and suggest a call. If I can't, I'll tell you straight away rather than waste your time.

For context: I work mainly with UK membership bodies, charities and research organisations, and with the agencies that look after their websites. Not recruiters.

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Fullcalendar View

Fullcalendar View

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