CVE-2026-84916: Drupal Islandora advanced search access bypass via AJAX

CVE-2026-84916 · Severity: info · Published 2026-10-22

The islandora_advanced_search module for Drupal, which enables dynamic search and block updates, fails to properly verify access permissions on an AJAX endpoint. An unauthenticated attacker who knows or guesses a block's machine ID could retrieve restricted block content that should be hidden based on access control rules. Exploitation requires knowledge of specific block identifiers and is limited in scope since the submodule is not widely used in modern configurations.

Technologies: Packagist:Https://Packages.Drupal.Org/8 Drupal/Islandora. Vendors: Drupal, Packagist:Https://Packages.Drupal.Org/8.

Quick answers

Is CVE-2026-84916 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-84916 being exploited in the wild.
How severe is CVE-2026-84916?
Informational severity, published 22 October 2026.
Which products and versions are affected?
Drupal Islandora <2.19.0; Packagist:Https://Packages.Drupal.Org/8 Drupal/Islandora ECOSYSTEM:introduced=0,fixed=2.19.0.
Is there a fix for CVE-2026-84916?
Yes. Packagist:Https://Packages.Drupal.Org/8 Drupal/Islandora: upgrade to 2.19.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-84916 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2026-84916?
Check whether you run Drupal Islandora or Packagist:Https://Packages.Drupal.Org/8 Drupal/Islandora at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • Packagist:Https://Packages.Drupal.Org/8 Drupal/Islandora: upgrade to 2.19.0 or later

Technical details

The islandora_advanced_search submodule exposes a publicly accessible AJAX endpoint that processes arbitrary block IDs without sufficient access control validation. An unauthenticated attacker can submit crafted requests to retrieve the contents of blocks protected by block access restrictions or visibility rules, provided they can identify or brute-force valid block machine IDs. The vulnerability has been fixed in version 2.19.0.

Affected products

  • Drupal Islandora <2.19.0

Identifiers

  • CVE-2026-84916
  • DRUPAL-CONTRIB-2026-126

Timeline

  • 2026-09-02: disclosed

References

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