CVE-2021-40375

MEDIUM

Apperta Foundation OpenEyes 3.5.1 - Info Disclosure

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2021-40375. PoCs published by DCKento.

AI-analyzed exploit summary This repository contains a detailed writeup describing an improper access control vulnerability (CVE-2021-40375) in OpenEyes 3.5.1, where sensitive patient information is exposed in the page source despite a 'Forbidden' message. The reproduction steps outline how a low-privileged user can exploit this flaw to access PII and medical data.

Description

Apperta Foundation OpenEyes 3.5.1 allows remote attackers to view the sensitive information of patients without having the intended level of privilege. Despite OpenEyes returning a Forbidden error message, the contents of a patient's profile are still returned in the server response. This response can be read in an intercepting proxy or by viewing the page source. Sensitive information returned in responses includes patient PII and medication records or history.

Exploits (1)

nomisec WRITEUP 2 stars
by DCKento · poc
https://github.com/DCKento/CVE-2021-40375

This repository contains a detailed writeup describing an improper access control vulnerability (CVE-2021-40375) in OpenEyes 3.5.1, where sensitive patient information is exposed in the page source despite a 'Forbidden' message. The reproduction steps outline how a low-privileged user can exploit this flaw to access PII and medical data.

Classification
Writeup 100%
Attack Type
Info Leak
Complexity
Trivial
Reliability
Reliable
Target: OpenEyes 3.5.1
Auth required
Prerequisites: Access to a low-privileged user account · Valid patient profile URL
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (2)

Core 2
Core References
Product, Vendor Advisory x_refsource_misc
https://openeyes.apperta.org/
Exploit, Third Party Advisory x_refsource_misc
https://github.com/DCKento/CVE-2021-40375

Scores

CVSS v3 6.5
EPSS 0.0162
EPSS Percentile 73.1%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Details

CWE
CWE-200
Status published
Products (1)
apperta/openeyes 3.5.1
Published Apr 06, 2022
Tracked Since Feb 18, 2026