Diff security updates, in plain English

Diff

74,550 sites report using it · on drupal.org · 1 security update explained here

This module lets people see the exact words that were added or removed between different saved versions of content.

Below is every security update for Diff 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.

Diff

Moderately critical · 74,550 sites report using it · SA-CONTRIB-2026-096 · on drupal.org · Week of 12 August 2026

A visitor could see the history of changes for certain pieces of data if they already had the access right to view the current version. They could read past versions of this data that should have been kept private. They could not make any changes to the content or its history.

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 moderately critical. Include it in your next routine update, within the month.

Tell your developerUpdate Diff to 2.0.1 or 2.1.1, whichever branch you are on.

For developers: what the fix changed

The fix updates the entity access requirement in src/Routing/DiffRouteProvider.php to check for the 'view all revisions' permission instead of just the 'view' permission.

2.0.0 to 2.0.1 1 commit, 1 file.

src/Routing/DiffRouteProvider.php +1 −1 fix

Full diff, 2.0.0 to 2.0.1 · Full diff, 2.1.0 to 2.1.1

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.

Diff

Diff

Send me your Drupal site's address.

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Reference