CVE-2023-5256: Drupal core - Critical - Cache poisoning - SA-CORE-2023-006

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-09-28 · updated 2026-06-17
Weakness: CWE-200

Description

In certain scenarios, Drupal's JSON:API module will output error backtraces. With some configurations, this may cause sensitive information to be cached and made available to anonymous users, leading to privilege escalation. This vulnerability only affects sites with the JSON:API module enabled, and can be mitigated by uninstalling JSON:API. The core REST and contributed GraphQL modules are not affected.

Affected products

Drupal: from 8.7.0 before 9.5.11; from 10.0.0 before 10.0.11; from 10.1.0 before 10.1.4 — fixed in 10.0.11, 10.1.4, 9.5.11

How to fix

Upgrade to a fixed version: Drupal 10.0.11, 10.1.4, 9.5.11. Check the vendor advisory for mitigations.

References

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