Mermaid Diagram Field security updates, in plain English

Mermaid Diagram Field

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

This module lets you add diagrams to a piece of content or display them in a pop up window.

Below is every security update for Mermaid Diagram Field 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.

Mermaid Diagram Field

Moderately critical · 304 sites report using it · SA-CONTRIB-2026-180 · on drupal.org · Week of 23 September 2026

An ordinary account on the site could view diagram content in a pop up window without the correct access rights. They could see hidden charts meant for other users. They could not alter the diagrams.

Who could do thisOnly someone with a login on your site.
Does it apply to youThis applies if the pop up display option is turned on for the diagram field or if the attacker knows the exact web address of the pop up.
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 Mermaid Diagram Field to 1.0.10.

For developers: what the fix changed

The fix changes MermaidModalController::build in src/Controller/MermaidModalController.php to load the default revision instead of the latest revision and adds explicit view access checks for the entity and the field.

Also in this release Added a hook for CSV export in mermaid_diagram_field.module.

1.0.9 to 1.0.10 2 commits, 2 files.

mermaid_diagram_field.module +54 −0
src/Controller/MermaidModalController.php +10 −3 fix

Full diff, 1.0.9 to 1.0.10

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

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Mermaid Diagram Field

Mermaid Diagram Field

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