Drupal AlternativeCommerce (Basket) security updates, in plain English

Drupal AlternativeCommerce (Basket)

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

This software adds an online shop and checkout to a website.

Below is every security update for Drupal AlternativeCommerce (Basket) 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.

Drupal AlternativeCommerce (Basket)

Highly critical · 510 sites report using it · SA-CONTRIB-2026-038 · on drupal.org · Week of 27 May 2026

A person without an account could send specific data to the website to run their own computer code. This would let them view any private information stored on the site. They could also alter any content or change the underlying software itself.

Who could do thisAnyone visiting the site. No login needed.
Does it apply to youThis applies if a specific chain of code exists in the website software or its additions.
Has it been used in attacksNo sign of it.
How urgentDrupal rates this highly critical. Cyber Essentials expects a fix within 14 days. Do it this week.

Tell your developerUpdate Drupal AlternativeCommerce (Basket) to 2.1.17.

For developers: what the fix changed

Replaces `serialize()` and `unserialize()` with `json_encode()` and `json_decode()` for `payInfo` in `src/BasketOrderForm.php` and `src/Controller/Pages.php`, adding a fallback to a safe `unserialize()` with `allowed_classes` set to `FALSE` for legacy data.

Also in this release Added CSRF token validation for API actions, hardened payment callback order finalization, and fixed negative values in basket count calculation.

2.1.16 to 2.1.17 6 commits, 6 files.

basket.libraries.yml +1 −0
basket.module +4 −0
misc/basket.js +6 −2
src/BasketOrderForm.php +11 −11 fix
src/Controller/Pages.php +50 −3 fix
src/Query/BasketQuery.php +1 −1

Full diff, 2.1.16 to 2.1.17

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.

Drupal AlternativeCommerce (Basket)

Drupal AlternativeCommerce (Basket)

Send me your Drupal site's address.

Get in touch

Links

Reference