Yourls
CVE-2021-3734
HIGH
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A06:2025 - Insecure Design
ASVS 5.0
V3 - Web Frontend Security Clickjacking prevention, X-Frame-Options
|
| Impact | CVSS score of 8.8 (HIGH). Attack characteristics: network attack vector, low complexity, no privileges required, user interaction required. Public proof-of-concept exploit code is available. |
| Exploit ScenarioDerived | This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the high-severity affected system. |
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Alert meAnalysisAI
yourls is vulnerable to Improper Restriction of Rendered UI Layers or Frames. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available.
RemediationAI
A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 1 package in composer
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
This vulnerability is classified under CWE-1021. yourls is vulnerable to Improper Restriction of Rendered UI Layers or Frames Affected products include: Yourls.
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
DescriptionNVD
yourls is vulnerable to Improper Restriction of Rendered UI Layers or Frames
Threat Intelligence Overview
NVD
CVE.org
EPSS
GitHub
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Cross-Site Scripting occurs when an application accepts untrusted data and sends it to a web browser without proper validation or encoding.
Affected Products (CPE)NVD
YOURLS through 1.7.3 is affected by a type juggling vulnerability in the api component that can result in login bypass.
Stored XSS in YOURLS 1.5.1 through 1.10.3 enables unauthenticated attackers to inject arbitrary JavaScript into per-link
Cross-Site Request Forgery (CSRF) in GitHub repository yourls/yourls prior to 1.8.3. Rated high severity (CVSS 7.4), thi
yourls is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'). Rated medi
Cross-site scripting (XSS) vulnerability in the administrator panel in Yourls 1.7 allows remote attackers to inject arbi
yourls is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'). Rated medi
Multiple Stored Cross Site Scripting (XSS) vulnerabilities exist in the YOURLS Admin Panel, Versions 1.5 - 1.7.10. Rated
Path traversal in YOURLS before 1.10.5 lets an attacker escalate a pre-planted PHP file into code execution: the keyword
Exploit-DB