TI-2020-13821 Aliases CVE-2020-20290 GHSA-7fxc-vwm3-9www

Directory traversal vulnerability in the yccms 3.3 project.

LOW 36CWE-22Published 2021-02-01 · Updated 2024-08-04

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: None · High · None
Fix status: No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA.

Summary

Directory traversal vulnerability in the yccms 3.3 project. The delete, deletesite, and deleteAll functions' improper judgment of the request parameters, triggers a directory traversal vulnerability.

Why it matters now

EPSS 0.01346 71st percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:yccms:yccms:3.3:::::::*	3.3	Vulnerable	Yccms

cpe:2.3:a:yccms:yccms:3.3:*:*:*:*:*:*:* Versions 3.3 Vulnerable ·Yccms

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2020-20290
2026-10-03 Alias added: GHSA-7fxc-vwm3-9www

References

Exploit 1

https://blog.jiguang.xyz/posts/yccms-directory-traversal-vulnerability-report/

TI-2020-13819 Unrestricted file upload vulnerability in the yccms 3.3 project. CVSS 3.1CRITICAL 9.8
TI-2020-13820 Sql injection vulnerability in the yccms 3.3 project. CVSS 3.1CRITICAL 9.8
TI-2025-39515 YCCMS 3.4 contains a stored cross-site scripting (XSS) vulnerability in the article… CVSS 3.1MEDIUM 6.1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences