CVE-2021-47721Public exploitNetwork attack vector

Account takeover via unbound session cookie

Published Dec 23, 2025 · Updated Mar 5, 2026

Authorization bypass in Orangescrum 1.8.0 allows remote authenticated users to take over another project member's account via a session cookie. The dashboard page source exposes each assigned user's uniq_id, and the server accepts that value in the USER_UNIQ cookie without binding it to the authenticated account. Project membership is required, and successful substitution grants the victim's application session and associated access.

CVSS severity8.7
High
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in Orangescrum 1.8.0 allows remote authenticated users to take over another project member's account via a session cookie. The dashboard page source exposes each assigned user's uniq_id, and the server accepts that value in the USER_UNIQ cookie without binding it to the authenticated account. Project membership is required, and successful substitution grants the victim's application session and associated access.

The record

CVE
CVE-2021-47721
Published
Dec 23, 2025
Updated
Mar 5, 2026
Vendor
Andolasoft Inc.
Product
Orangescrum
Classifications
CWE-639, T1550.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 23, 2025CVE publishedPublication date reported by the CVE source.
  2. Mar 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.8.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Andolasoft Inc. · Orangescrumversion=1.8.0

Published CVSS scores

8.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.7VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-639Authorization Bypass Through User-Controlled Key
T1550.004Use Alternate Authentication Material: Web Session Cookie

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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