← Vulnerability feed

Vulnerability record · CVE-2021-3783 · published 15 September 2021

CVE-2021-3783: Yourls cross-site scripting vulnerability

Yourls · Yourls

yourls is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

6.1 CVSS 3.1 Medium EPSS 0.70% · top 48.9% CWE-79 · Cross-site scripting
6.1CVSS 3.1 base score, v2 4.3
0.70%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

yourls is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/yourls/yourls/commit/94f6bab91182142c96ff11f481585b445449efd4 PatchThird Party Advisory
https://huntr.dev/bounties/b688e553-d0d9-4ddf-95a3-ff4b78004984 Issue TrackingPatchThird Party Advisory
https://github.com/yourls/yourls/commit/94f6bab91182142c96ff11f481585b445449efd4 PatchThird Party Advisory
https://huntr.dev/bounties/b688e553-d0d9-4ddf-95a3-ff4b78004984 Issue TrackingPatchThird Party Advisory

Track CVE-2021-3783 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

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%8.8CVE-2021-3734Yourls clickjacking vulnerabilityyourls is vulnerable to Improper Restriction of Rendered UI Layers or FramesEPSS 0.40%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%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%6.1CVE-2026-42897Microsoft Exchange Server XSS enables spoofingMicrosoft Exchange Server and Exchange Server Subscription Edition fail to neutralize input during web page generation, a cross-site scripting flaw (…KEVEPSS 0.52%analysed

Source: NIST National Vulnerability Database (record CVE-2021-3783), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.