Auth bypass in Orangescrum
CVE-2021-47721
Orangescrum 1.8.0 contains a privilege escalation vulnerability that allows authenticated users to take over other project-assigned accounts by manipulating session cookies. Attackers can extract the victim's unique ID from the page source and replace their own session cookie to gain unauthorized access to another user's account.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (37.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 37.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: -0.000
Affected products
- Orangescrum — versions 1.8.0
Weakness classification (CWE)
References
- www.exploit-db.com/exploits/50551 (Exploit, exploit)
- www.orangescrum.org/ (Product, product)
- www.vulncheck.com/advisories/orangescrum-authenticated-privilege-escalation-via… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2021-47721?
- CVE-2021-47721 is a high-severity vulnerability in Orangescrum, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 8.8/10. Published 2025-12-23.
- How severe is CVE-2021-47721?
- High severity. CVSS v3 base score is 8.8 out of 10.