---
id: CVE-2026-88065
title: >-
  `tts-be` is a backend for a timetable selector that aims to help students
  better choose their class schedules
summary: >-
  `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}/ph…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-200
  - CWE-306
  - CWE-639
vendor: NIAEFEUP
product: tts-be
affected:
  - tts-be < 2.1.0
published: '2026-09-15'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T14:17:12.413'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-88065'
references:
  - url: 'https://github.com/NIAEFEUP/tts-be/security/advisories/GHSA-fpfp-hr42-fvpm'
    label: security-advisories@github.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-16T13:58:01.235301Z'
epss: 0.00509
epssPercentile: 0.40868
ingestedAt: '2026-09-15T20:44:02.614Z'
---

## Overview

`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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.