GHSA-6mp4-q625-mxjp: YOURLS is vulnerable to XSS through JSONP and Callback request parameters

high Affects yourls/yourls. Feed 2026.10.29.3, updated 2026-10-29; published 2025-12-30.

YOURLS is vulnerable to XSS through JSONP and Callback request parameters

Package: yourls/yourls Composer
Affected versions: <=1.10.2
Fixed in: no fix recorded
Severity: high CVSS 7.1
Exploitation: not on CISA KEV
Published: 2025-12-30
Source: osv.dev

References

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# PHP projects (recommended)
composer require --dev phpwarden/phpwarden
# then
vendor/bin/phpwarden deps composer.lock

# or, without Composer
pipx install phpwarden   &&   phpwarden deps composer.lock

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Install docs How findings are ranked

Related advisories

CVE-2019-14537 critical Access of Resource Using Incompatible Type ('Type Confusion') in yourls/yourls same package: yourls/yourls
CVE-2022-0088 low Cross-Site Request Forgery in YOURLS same package: yourls/yourls
CVE-2021-3785 medium Cross-site Scripting in yourls same package: yourls/yourls
CVE-2020-27388 medium YOURLS Stored Cross Site Scripting (XSS) same package: yourls/yourls
CVE-2021-3783 medium Cross-site Scripting in yourls same package: yourls/yourls
CVE-2026-62858 medium YOURLS: Unauthenticated File Inclusion same package: yourls/yourls