What is CVE-2023-38884?

CVE-2023-38884 is a high-severity vulnerability in Os4ed Opensis, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 7.5/10. Published 2023-11-20.

How severe is CVE-2023-38884?

High severity. CVSS v3 base score is 7.5 out of 10.

Auth bypass in Os4ed Opensis

CVE-2023-38884

An Insecure Direct Object Reference (IDOR) vulnerability in the Community Edition version 9.0 of openSIS Classic allows an unauthenticated remote attacker to access any student's files by visiting '/assets/studentfiles/<studentId>-<filename>'

Vulnerability class: IDOR (Insecure Direct Object Reference)

Published 2023-11-20 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.009 (57.6th percentile), scored 2026-10-03.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 57.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Os4ed Opensis — versions 9.0

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

github.com/OS4ED/openSIS-Classic (Release Notes)
www.os4ed.com/ (Product)
github.com/dub-flow/vulnerability-research/tree/main/CVE-2023-38884 (Vendor Advisory)

Frequently asked questions

What is CVE-2023-38884?: CVE-2023-38884 is a high-severity vulnerability in Os4ed Opensis, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 7.5/10. Published 2023-11-20.
How severe is CVE-2023-38884?: High severity. CVSS v3 base score is 7.5 out of 10.