Signature pad widget security updates, in plain English

Signature pad widget

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

This module lets users create and save electronic signatures as images.

Below is every security update for Signature pad widget 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.

Signature pad widget

Critical · 215 sites report using it · SA-CONTRIB-2026-285 · on drupal.org · Week of 28 October 2026

The module does not properly clean user submitted content before saving it. Someone could upload a malicious file to run unsafe scripts and change or add data. They could not do this without the ability to submit a signature.

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 Signature pad widget to 8.x-1.15.

For developers: what the fix changed

The fix introduces SVG sanitisation using the `enshrined/svg-sanitize` library in `SignWidgetController::save` and adds image validation to ensure uploaded files are valid PNGs in `SendSignForm::saveSign` and `SignWidget::massageFormValues`.

Also in this release The release also adds a new permission, implements CSRF token protection for AJAX requests, and refactors hook implementations to use attributes.

8.x-1.12 to 8.x-1.15 9 commits, 18 files including 5 tests.

README.md +1 −1
composer.json +3 −0 fix
js/build/signature.js +1 −1
js/ckeditor5_plugins/signature/src/InsertSignatureCommand.js +10 −5
js/sign_widget.js +17 −11
sign_widget.module +6 −28
sign_widget.permissions.yml +3 −0
sign_widget.routing.yml +5 −2
sign_widget.services.yml +5 −0
src/Controller/SignWidgetController.php +70 −3 fix
src/Form/SendSignForm.php +46 −7 fix
src/Hook/SignWidgetHooks.php +56 −0

Full diff, 8.x-1.12 to 8.x-1.15

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 membership bodies, charities 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.

Signature pad widget

Signature pad widget

Send me your Drupal site's address.

Get in touch

Links

Reference