CVE-2020-26173: An incorrect access control implementation in Tangro Business Workflow before 1.18.1 allows an attacker to dow

Q: How do I fix CVE-2020-26173?

business workflow: upgrade to 1.18.1. Exact commands for each OS are on this page.

Q: Is CVE-2020-26173 being exploited?

CVE-2020-26173 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2020-26173 affect?

CVE-2020-26173 affects business workflow. Severity is low (CVSS 3.1). An incorrect access control implementation in Tangro Business Workflow before 1.18.1 allows an attacker to download documents (PDF) by providing a valid document ID and token. No further authentication is required.

Q: How urgent is CVE-2020-26173?

Priority 29/100. Public exploit reference

Routine

LOW 3.1UPGRADE

CVE-2020-26173 is a low-severity flaw (CVSS 3.1) affecting business workflow. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An incorrect access control implementation in Tangro Business Workflow before 1.18.1 allows an attacker to download documents (PDF) by providing a valid document ID and token. No further authentication is required.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	3.1 (Low)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.7% (top 45%)
CISA exploited list	No
Weakness	CWE-306, CWE-639
Published	2020-12-18
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: tangro

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2020-12-18 10:15 UTCPublished CVE record published
2026-06-17 03:07 UTCUpdated Record last modified

tangro business workflow UPGRADE

Affected: < 1.18.1

Fixed in: 1.18.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy business-workflow || rpm -q business-workflow || business-workflow --version

2. UPGRADE to 1.18.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade business-workflow

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade business-workflow

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-26173?

business workflow: upgrade to 1.18.1. Exact commands for each OS are on this page.

Is CVE-2020-26173 being exploited?

CVE-2020-26173 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-26173 affect?

CVE-2020-26173 affects business workflow. Severity is low (CVSS 3.1). An incorrect access control implementation in Tangro Business Workflow before 1.18.1 allows an attacker to download documents (PDF) by providing a valid document ID and token. No further authentication is required.

How urgent is CVE-2020-26173?

Priority 29/100. Public exploit reference

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References

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