CVE-2026-63135: YOURLS has stored XSS in referrer statistics chart via crafted Referer header

high Affects yourls/yourls. Feed 2026.10.29.3, updated 2026-10-29; published 2026-08-21.

YOURLS has stored XSS in referrer statistics chart via crafted Referer header

Package: yourls/yourls Composer
Affected versions: >=1.5.1 and <1.10.4
Fixed in: 1.10.4
Severity: high CVSS 8.2
Exploitation: not on CISA KEV · EPSS 0% (36.7th percentile)
Published: 2026-08-21
Source: osv.dev

References

Am I affected?

Find out in one command. phpwarden checks your composer.lock against this advisory and 20,000+ others, ranked by real-world exploitation (CISA KEV + EPSS). Free, offline, open data.

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

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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