CVE-2020-26176 Missing authorization in n/a

Medium 4.3 Published 18 Dec 2020 Updated 4 Aug 2024

Attackers can list attachments for any workitem by guessing document IDs due to missing access control checks on the API endpoint.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2020-26176?

CVE-2020-26176 is a medium-severity missing authorization vulnerability in n/a, published on 18 Dec 2020. Any signed-in user can exploit it over the network, with no action from the victim.

Official 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.

Weakness: CWE-922

Which versions are affected by CVE-2020-26176?

It affects 1 product.

Products include Tangro Business Workflow.

How do I fix CVE-2020-26176?

No fix has been published for CVE-2020-26176 yet. Limit exposure of the affected software until one is available.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2020-26176 being exploited?

There is no known exploitation of CVE-2020-26176 in the wild and no public exploit code.

Sources

Also known as GHSA-w664-p7q3-cm25.