Executive Summary

CVE-2025-69727 is an Incorrect Access Control vulnerability in INDEX-EDUCATION PRONOTE versions prior to 2025.2.8. The issue lies in the way the software constructs direct URLs to user profile images using predictable identifiers like user IDs and names.

Because there are no proper authorization checks or rate-limiting mechanisms, an unauthenticated or unauthorized attacker can guess or know these identifiers and retrieve profile pictures by crafting requests to these URLs.

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Impact Analysis

This vulnerability allows unauthorized individuals to access user profile images without authentication. This can lead to privacy violations as sensitive user information (profile pictures) can be accessed and potentially misused.

Additionally, the lack of rate-limiting means attackers can perform mass retrieval of profile images, increasing the scale of the privacy breach.

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Compliance Impact

I don't know

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Detection Guidance

This vulnerability can be detected by attempting to access user profile images through crafted URLs based on predictable user identifiers such as user IDs and sanitized usernames.

A practical approach is to iterate over a list of known or guessed user IDs and usernames, replacing whitespace with underscores, and then constructing URLs to profile images using the pattern described in the vulnerability.

For example, you can use command-line tools like curl or wget to send HTTP requests to these constructed URLs and check if the profile images are accessible without authentication.

• Use a script or command to generate URLs like: https://demo.index-education.net/pronote/<path> where <path> is built from user IDs and sanitized usernames.
• Example curl command to test access: curl -I https://demo.index-education.net/pronote/path_to_profile_image
• Automate requests over a range of user IDs and usernames to detect unauthorized access to profile images.

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Mitigation Strategies

Immediate mitigation steps include applying the official update to INDEX-EDUCATION PRONOTE version 2025.2.8 or later, where this vulnerability has been fixed.

Until the update can be applied, restrict access to the affected components by implementing proper authorization checks and rate-limiting on the server side to prevent unauthorized and mass retrieval of profile images.

Additionally, monitor access logs for unusual patterns of requests targeting user profile images and block suspicious IP addresses if necessary.

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