Peter Brady, Drupal developer and private AI consultant

Drupal security updates, in plain English · Module

Theme Negotiation by Rules

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

This module allows a website to display pages with different designs based on specific conditions.

Below is every security update for Theme Negotiation by Rules 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.

Theme Negotiation by Rules

Moderately critical · 129 sites report using it · SA-CONTRIB-2026-012 · on drupal.org · Week of 25 February 2026

The module uses insecure web requests to turn design rules on or off. Someone could trick an administrator into clicking a link to change these rules. They could not view private details but they could alter website settings.

  • Who could do thisAnyone visiting the site. No login needed.
  • Does it apply to youA site is affected if an attacker knows the internal system name of a design rule.
  • 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 Theme Negotiation by Rules to 1.2.1.

For developers: what the fix changed

Adds CSRF token requirements to the enable and disable routes in theme_rule.routing.yml.

1.2.0 to 1.2.1 1 commit, 1 file.

  • theme_rule.routing.yml +2 −0 fix

Full diff, 1.2.0 to 1.2.1

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

Not sure what your site is running?

Send me your Drupal site's address.

I'll tell you what I can see from outside, what the Drupal 10 end of life on 9 December means for it, and what it would cost to have me keep it patched. There's no charge for that and no obligation. peter@peterbrady.co.uk

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.

peter@peterbrady.co.uk

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.

Peter Brady, Drupal developer and private AI consultant

PNB Technologies Limited
55 Yew Tree Road, Ormskirk
Lancashire, L39 1NT, United Kingdom

Company Reg: 07166600
VAT Reg: GB986726850

© 2026 Peter Brady. All rights reserved.

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