TI-2021-14834 Aliases CVE-2021-36686 GHSA-4jqw-vfmj-9rmh

Cross Site Scripting (XSS) vulnerability in yapi 1.9.1 allows attackers to execute…

MEDIUM 58CWE-79Published 2023-01-26 · Updated 2025-04-01

Key facts

Attack vector: Network
Privileges required: Low
User interaction: Required
Attack complexity: Low
Impact type: Cross-site scripting
Confidentiality · integrity · availability: Low · Low · None
Fix status: No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and GitHub. Impact type from CWE-79.

Summary

Cross Site Scripting (XSS) vulnerability in yapi 1.9.1 allows attackers to execute arbitrary code via the /interface/api edit page.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00564 47th 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

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA
—	yapi-vendor (npm)	up to 1.9.1	—	No fix listed	GHSA-4jqw-vfmj-9rmh

— Vendor— Affected all versions Fixed in — No fix listed CNA
yapi-vendor (npm) Vendor— Affected up to 1.9.1 Fixed in — No fix listed GHSA-4jqw-vfmj-9rmh

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:ymfe:yapi:1.9.1:::::::*	1.9.1	Vulnerable	Ymfe

cpe:2.3:a:ymfe:yapi:1.9.1:*:*:*:*:*:*:* Versions 1.9.1 Vulnerable ·Ymfe

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2021-36686
2026-10-03 Alias added: GHSA-4jqw-vfmj-9rmh

References

Exploit 1

https://github.com/YMFE/yapi/issues/2190

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2021-36686

Other 2

TI-2025-43010 An issue pertaining to CWE-400: Uncontrolled Resource Consumption was discovered in YMFE… CVSS 3.1HIGH 7.5
TI-2025-43009 An issue pertaining to CWE-295: Improper Certificate Validation was discovered in YMFE… CVSS 3.1HIGH 7.4
TI-2018-12520 An issue was discovered in YMFE YApi 1.3.23. CVSS 3.0MEDIUM 5.4
TI-2025-43011 An issue pertaining to CWE-79: Improper Neutralization of Input During Web Page… CVSS 3.1MEDIUM 5.4
TI-2021-09224 Weak JSON Web Token (JWT) signing secret generation in YMFE YApi through 1.9.2 allows… CVSS 3.1MEDIUM 5.1

Sources

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