CVE-2026-88065

`tts-be` application has a Broken Access Control vulnerability

State: Published
Severity: 7.5 High
Published: Sep 15, 2026
Updated: Sep 16, 2026
Reserved: Sep 9, 2026

Description

`tts-be` is a backend for a timetable selector that aims to help students better choose their class schedules. Versions prior to 2.1.0 have a Broken Access Control vulnerability across several API endpoints (such as `/api/student/{id}/photo` and `/api/course_unit/{id}/exchange/metadata`). By chaining these unauthenticated endpoints, a remote attacker can use the backend as an open proxy to bypass authorization checks, allowing for the enumeration and extraction of sensitive Personally Identifiable Information (PII) from upstream university systems. The exposed data includes full names, student IDs, class schedules, and photos. This issue was fixed in version 2.1.0.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N	GitHub_M

Weaknesses

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
CWE-306 Missing Authentication for Critical Function
CWE-639 Authorization Bypass Through User-Controlled Key

Affected Products

Product	Versions
tts-beNIAEFEUP	< 2.1.0Affected

References

https://github.com/NIAEFEUP/tts-be/security/advisories/GHSA-fpfp-hr42-fvpm

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