YOURLS up to 1.10.3 Statistics Chart Builder yourls-infos.php yourls_get_referrer cross site scripting

Summaryinfo

A vulnerability was found in YOURLS up to 1.10.3. It has been rated as problematic. This issue affects the function yourls_get_referrer of the file yourls-infos.php of the component Statistics Chart Builder. Performing a manipulation results in cross site scripting. This vulnerability was named CVE-2026-63135. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability was found in YOURLS up to 1.10.3. It has been classified as problematic. This affects the function yourls_get_referrer of the file yourls-infos.php of the component Statistics Chart Builder. The manipulation with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. This is going to have an impact on integrity. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-63135 since 07/15/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

By approaching the search of inurl:yourls-infos.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 1.10.4 eliminates this vulnerability.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Name

• YOURLS

Version

• 1.10.0
• 1.10.1
• 1.10.2
• 1.10.3

Website

• Product: https://github.com/YOURLS/YOURLS/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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