{"apiVersion":"1.0","identifier":"CVE-2026-63135","description":"YOURLS is a self-hosted, customizable URL shortener written in PHP. From 1.5.1 until 1.10.4, YOURLS stores the HTTP Referer header through yourls_get_referrer(), yourls_sanitize_url_safe(), and yourls_log_redirect(), then aggregates the value in yourls-infos.php and passes the derived domain through yourls_get_domain(), yourls_stats_pie(), and yourls_google_array_to_data_table(). The chart builder concatenates labels into inline JavaScript without JavaScript-string escaping, so an unauthenticated attacker can poison the statistics of an existing short URL with a crafted referrer. When an administrator or public stats-page viewer opens the affected statistics page, attacker-controlled JavaScript executes in the YOURLS origin and can access admin-visible data, the API signature token, and privileged same-origin actions. This issue is fixed in version 1.10.4.","publishedAt":"2026-08-21T21:17:01","lastModifiedAt":"2026-08-26T18:16:56","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-63135","cvssScore":8.2,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:N","epssProbability":0.00247,"riskScore":0.84,"affectedProduct":"YOURLS","affectedVersions":">=1.5.1,<1.10.4","vulnerabilityType":"Web app","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-63135","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-63135","en":"https://www.redsauce.net/en/cves/CVE-2026-63135","fr":"https://www.redsauce.net/fr/cves/CVE-2026-63135","pt":"https://www.redsauce.net/pt/cves/CVE-2026-63135","de":"https://www.redsauce.net/de/cves/CVE-2026-63135","sk":"https://www.redsauce.net/sk/cves/CVE-2026-63135","el":"https://www.redsauce.net/el/cves/CVE-2026-63135"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-63135"}}