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Not in CISA KEV
MEDIUM severity

CVE-2020-27388 — yourls

MEDIUMFix: YOURLS/YOURLS#2761

CVE-2020-27388 is a medium-severity (CVSS 5.4) Cross-site Scripting (XSS) vulnerability in yourls/yourls. A fix is available for yourls/yourls — see the affected versions and patch details below.

YOURLS Stored Cross Site Scripting (XSS)

Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 7, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.7%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs54th percentile — riskier than 54% of all scored CVEsHighest risk
0.06%0.46%0.86%1.25%0.6%0.7%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🐘yourls/yourls

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

Multiple Stored Cross Site Scripting (XSS) vulnerabilities exist in the YOURLS Admin Panel, Versions 1.5 - 1.7.10. An authenticated user must modify a PHP plugin with a malicious payload and upload it, resulting in multiple stored XSS issues.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistyourls/yourls≥ 1.5&&< 1.81.8composer require yourls/yourls:^1.8

Affected Products

1 product · 1 configurations
Application
yourlsyourls
≥ 1.5 && ≤ 1.7.10
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for yourls/yourls, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update yourls/yourls to 1.8 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-27388 is resolved across your whole dependency graph.

  3. Workarounds

    Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

Multiple Stored Cross Site Scripting (XSS) vulnerabilities exist in the YOURLS Admin Panel, Versions 1.5 - 1.7.10. An authenticated user must modify a PHP plugin with a malicious payload and upload it, resulting in multiple stored XSS issues.
O3 Security · Impact-Aware SCA

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CVE-2020-27388: yourls XSS — Fixed in 1.8