What’s Vulnerable › Vulnerabilities

CVE-2023-27485: Insufficient verification of authorisation when accessing subresults in thmmniii/fbs-core

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-03-07 · updated 2026-06-17
• Weakness: CWE-863

Description

thmmniii/fbs-core is an open source feedback system for students. In versions prior to 1.5.3 when querying `subresults`, it is possible to query `subresults` from other users due to insufficient authorisation. This is only possible for logged-in users and it is not possible to associate the subresults with a specific user. This bug was fixed in commit `f1ae67d8bb2`and released with version 1.5.3. Users are advised to upgrade. There are no known workarounds for this issue.

Affected products

• thm-mni-ii feedbacksystem: before 1.5.3 — fixed in 1.5.3

How to fix

Upgrade to a fixed version: thm-mni-ii feedbacksystem 1.5.3. Check the vendor advisory for mitigations.

References

• https://github.com/thm-mni-ii/feedbacksystem/commit/f1ae67d8bb2286a8eb15949038473d41b1358493
• https://github.com/thm-mni-ii/feedbacksystem/releases/tag/v1.5.3
• https://github.com/thm-mni-ii/feedbacksystem/security/advisories/GHSA-fhq8-p3w6-mmgr
• https://thm-mni-ii.github.io/feedbacksystem/api-docs/#tag/Submission/operation/getCourseTaskSubmissionSubresults
• https://github.com/thm-mni-ii/feedbacksystem/commit/f1ae67d8bb2286a8eb15949038473d41b1358493
• https://github.com/thm-mni-ii/feedbacksystem/releases/tag/v1.5.3
• https://github.com/thm-mni-ii/feedbacksystem/security/advisories/GHSA-fhq8-p3w6-mmgr
• https://thm-mni-ii.github.io/feedbacksystem/api-docs/#tag/Submission/operation/getCourseTaskSubmissionSubresults

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