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Vulnerability record · CVE-2021-3734 · published 26 August 2021
CVE-2021-3734: Yourls clickjacking vulnerability
Yourls · Yourls
yourls is vulnerable to Improper Restriction of Rendered UI Layers or Frames
8.8 CVSS 3.1 High EPSS 0.40% · top 67.8% CWE-1021 · ClickjackingCWE-352 · Cross-site request forgery
8.8CVSS 3.1 base score, v2 6.8
0.40%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
17 Jun 2026Last modified by NVD
Description
yourls is vulnerable to Improper Restriction of Rendered UI Layers or Frames
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Affected products
1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.
References
| Link | Tags |
|---|---|
| https://github.com/yourls/yourls/commit/0a70acdcfb5fcbc63dbc5750018d608288eba3fe | PatchThird Party Advisory |
| https://huntr.dev/bounties/dd2e2dbe-efe5-49ec-be11-7a7e7c41debd | ExploitIssue TrackingThird Party Advisory |
| https://github.com/yourls/yourls/commit/0a70acdcfb5fcbc63dbc5750018d608288eba3fe | PatchThird Party Advisory |
| https://huntr.dev/bounties/dd2e2dbe-efe5-49ec-be11-7a7e7c41debd | ExploitIssue TrackingThird Party Advisory |
Track CVE-2021-3734 inside VULONE
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Related vulnerabilities
Same products first, then exploited flaws of the same weakness class.
9.8CVE-2019-14537Yourls type confusion vulnerabilityYOURLS through 1.7.3 is affected by a type juggling vulnerability in the api component that can result in login bypass.EPSS 6.1%7.4CVE-2022-0088Yourls cross-site request forgery vulnerabilityCross-Site Request Forgery (CSRF) in GitHub repository yourls/yourls prior to 1.8.3.EPSS 2.0%6.1CVE-2021-3783Yourls cross-site scripting vulnerabilityyourls is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')EPSS 0.70%5.4CVE-2021-3785Yourls cross-site scripting vulnerabilityyourls is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')EPSS 0.72%5.4CVE-2020-27388Yourls cross-site scripting vulnerabilityMultiple Stored Cross Site Scripting (XSS) vulnerabilities exist in the YOURLS Admin Panel, Versions 1.5 - 1.7.10. An authenticated user must modify …EPSS 0.72%5.0CVE-2011-3824Yourls information exposure vulnerabilityYour Own URL Shortener (YOURLS) 1.5 allows remote attackers to obtain sensitive information via a direct request to a .php file, which reveals the in…EPSS 1.2%4.3CVE-2014-8488Yourls cross-site scripting vulnerabilityCross-site scripting (XSS) vulnerability in the administrator panel in Yourls 1.7 allows remote attackers to inject arbitrary web script or HTML via …EPSS 1.9%
Source: NIST National Vulnerability Database (record CVE-2021-3734), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.
