What’s Vulnerable › Vulnerabilities

CVE-2020-26176

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-12-18 · updated 2026-06-17
• Weakness: CWE-922

Description

An issue was discovered in tangro Business Workflow before 1.18.1. No (or broken) access control checks exist on the /api/document/<DocumentID>/attachments API endpoint. Knowing a document ID, an attacker can list all the attachments of a workitem, including their respective IDs. This allows the attacker to gather valid attachment IDs for workitems that do not belong to them.

Affected products

• Tangro Business Workflow: before 1.18.1 — fixed in 1.18.1

How to fix

Upgrade to a fixed version: Tangro Business Workflow 1.18.1. Check the vendor advisory for mitigations.

References

• https://blog.to.com/advisory-tangro-bwf-1-17-5-multiple-vulnerabilities/
• https://www.tangro.de/
• https://blog.to.com/advisory-tangro-bwf-1-17-5-multiple-vulnerabilities/
• https://www.tangro.de/

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