Tealium iQ Tag Management security updates, in plain English

Tealium iQ Tag Management

267 sites report using it · on drupal.org · 1 security update explained here

This module connects the website to a marketing system that lets you manage tracking tags and vendors.

Below is every security update for Tealium iQ Tag Management 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.

Tealium iQ Tag Management

Critical · 267 sites report using it · SA-CONTRIB-2026-064 · on drupal.org · Week of 24 June 2026

An ordinary account on the site could write malicious data directly to a tracking field. They could view any hidden information on the website and alter any files including the underlying code.

Who could do thisOnly someone with a login on your site.
Does it apply to youA site is affected if an attacker has the access right to edit a piece of content with a Tealium field attached and the data feed module is set to accept all changes or the attacker has another way to edit field values directly.
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 Tealium iQ Tag Management to 8.x-2.4.

For developers: what the fix changed

The fix adds the `['allowed_classes' => FALSE]` option to `unserialize()` calls in `FieldItemNormalizer.php`, `TealiumiqFieldItem.php`, `TealiumiqWidget.php`, and `Helper.php` to prevent PHP object injection.

8.x-2.3 to 8.x-2.4 2 commits, 4 files.

src/Normalizer/FieldItemNormalizer.php +1 −1 fix
src/Plugin/Field/FieldType/TealiumiqFieldItem.php +1 −1 fix
src/Plugin/Field/FieldWidget/TealiumiqWidget.php +1 −1 fix
src/Service/Helper.php +1 −1 fix

Full diff, 8.x-2.3 to 8.x-2.4

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

Get in touch

Tell me who you are, what your organisation does, and what you need. That might be a Drupal site that needs looking after, an upgrade to get done before December, or an agency that needs Drupal cover.

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 charities, membership bodies and research organisations, and with the agencies that look after their websites. Not recruiters.

Or start smaller and connect with me on LinkedIn. That's where I post what I find digging around in charity and grants data, and where the free tools turn up first.

Tealium iQ Tag Management

Tealium iQ Tag Management

Send me your Drupal site's address.

Get in touch

Links

Reference