Auth bypass in Grimmory-Tools Grimmory
CVE-2026-93954
A security vulnerability has been detected in grimmory-tools grimmory up to 3.3.3/3.4.1. Affected is the function AppSettingController.getAppSettings of the file backend/src/main/java/org/booklore/controller/AppSettingController.java of the component Settings API Endpoint. Such manipulation leads to incorrect authorization. The attack can be launched remotely. The exploit has been disclosed publicly and may be used. The name of the patch is 2b66ca6df8110f6b512e030b54c16b9fbe318f17. Applying a patch is advised to resolve this issue. PR #2558, merged as 53abc8b, moved the OIDC secret into a dedicated setting, but did not by itself restrict GET /api/v1/settings.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (33.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 33.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Grimmory-Tools Grimmory — versions 3.3.0, 3.3.1, 3.3.2
Weakness classification (CWE)
References
- vuldb.com/vuln/407913 (technical-description, vdb-entry)
- vuldb.com/vuln/407913/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-93954 (third-party-advisory)
- vuldb.com/submit/943919 (third-party-advisory)
- github.com/grimmory-tools/grimmory/issues/2430 (issue-tracking, exploit)
- github.com/grimmory-tools/grimmory/pull/2647 (issue-tracking, patch)
- github.com/grimmory-tools/grimmory/commit/2b66ca6df8110f6b512e030b54c16b9fbe318… (patch)
- github.com/grimmory-tools/grimmory/ (product)
Frequently asked questions
- What is CVE-2026-93954?
- CVE-2026-93954 is a medium-severity vulnerability in Grimmory-Tools Grimmory, classified under Improper Authorization. CVSS score: 4.3/10. Published 2026-09-19.
- How severe is CVE-2026-93954?
- Medium severity. CVSS v3 base score is 4.3 out of 10.