In tangro Business Workflow before 1.18.1, knowing an attachment ID, it is possible to download workitem attachments without being authenti…

published 2020-12-18 5y ago modified 2026-06-17 4mo ago also EUVD-2020-18803

cvss: 5.3; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.9%; EPSS 0.9% chance of exploitation in 30 days, percentile 59%
public exploits: 0; none known

In tangro Business Workflow before 1.18.1, knowing an attachment ID, it is possible to download workitem attachments without being authenticated.

Patch / fix

fixed in 1

tangro business_workflow 1.18.1

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Exploit prediction

0.90% chance of exploitation in the next 30 days, higher than 59% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

blog.to.com https://blog.to.com/advisory-tangro-bwf-1-17-5-multiple-vulnerabilities/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	3.1	5.3	CVSS:3.1/AC:L/AV:N/A:N/C:L/I:N/PR:N/S:U/UI:N
CNA	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
NVD	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:P/I:N/A:N

Classification

Weakness

CWE-639 Authorization Bypass Through User-Controlled Key

References

blog.to.com /advisory-tangro-bwf-1-17-5-multiple-vulnerabilities/
exploit, third-party-advisory
tangro.de /
product

Sources

CVE List CVE-2020-26178
NVD CVE-2020-26178

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