CVE-2021-36686 Cross-site Scripting in yapi-vendor

Medium 5.4 Published 26 Jan 2023 Updated 1 Apr 2025

Attackers can execute arbitrary code via XSS in the YAPI interface API edit page, compromising user sessions and data.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2021-36686?

CVE-2021-36686 is a medium-severity cross-site scripting vulnerability in n/a, published on 26 Jan 2023. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

Official description

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

Weakness: CWE-79

Which versions are affected by CVE-2021-36686?

2 open source packages ship an affected version, including yapi-vendor. It affects 1 product.

Package	Affected	Fixed in
`yapi-vendor` npm	All versions to `1.9.1`	None
`yapi-vendor` npm	All versions to `1.9.1`	None

Products include Ymfe Yapi.

How do I fix CVE-2021-36686?

No fix has been published for CVE-2021-36686 yet. Limit exposure of the affected software until one is available.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2021-36686 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-36686 exists.

Sources

Also known as CVE-2021-33237, GHSA-4jqw-vfmj-9rmh.