CVE-2020-26174

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.2% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2020-12-18 · updated 2026-06-17
Weakness: CWE-434

Description

tangro Business Workflow before 1.18.1 requests a list of allowed filetypes from the server and restricts uploads to the filetypes contained in this list. However, this restriction is enforced in the browser (client-side) and can be circumvented. This allows an attacker to upload any file as an attachment to a workitem.

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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