Date iCal security updates, in plain English

Date iCal

6,144 sites report using it · on drupal.org · 1 security update explained here

This module lets a website export its calendar as a data feed and import external calendars.

Below is every security update for Date iCal 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.

Date iCal

Critical · 6,144 sites report using it · SA-CONTRIB-2026-037 · on drupal.org · Week of 13 May 2026

A visitor without an account could view any private information on the website by looking at the calendar data feeds. They could read all hidden data on the site. They could not alter or delete any information.

Who could do thisAnyone visiting the site. No login needed.
Does it apply to youAny site using this module.
Has it been used in attacksNo sign of it.
How urgentDrupal rates this critical. Cyber Essentials expects a fix within 14 days. Do it this week.

Tell your developerUpdate Date iCal to 4.0.15.

For developers: what the fix changed

The fix adds access checks for entities and fields to the feed method in src/Controller/DateIcalController.php and sanitises user input in the download method. It also strips HTML tags from the rrule field in src/DateICal.php.

Also in this release The release also fixes an issue with finding the frequency in raw RRULEs.

4.0.14 to 4.0.15 2 commits, 2 files.

src/Controller/DateIcalController.php +65 −11 fix
src/DateICal.php +1 −1 fix

Full diff, 4.0.14 to 4.0.15

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

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Date iCal

Date iCal

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