CVE-2026-63135
YOURLS: Stored XSS in referrer statistics chart via crafted Referer header
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.
INFO
Published Date :
Aug. 21, 2026, 9:17 p.m.
Last Modified :
Oct. 14, 2026, 9:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | HIGH | MITRE-CVE |
Solution
- Update YOURLS to version 1.10.4.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-63135.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-63135 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-63135
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-63135 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-63135 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Oct. 14, 2026
Action Type Old Value New Value Added Translation Title: YOURLS, Description: YOURLS es un acortador de URL autoalojado y personalizable escrito en PHP. Desde la versión 1.5.1 hasta la 1.10.4, YOURLS almacena el encabezado HTTP Referer a través de yourls_get_referrer(), yourls_sanitize_url_safe() y yourls_log_redirect(), luego agrega el valor en yourls-infos.php y pasa el dominio derivado a través de yourls_get_domain(), yourls_stats_pie() y yourls_google_array_to_data_table(). El generador de gráficos concatena etiquetas en JavaScript en línea sin escape de cadenas de JavaScript, por lo que un atacante no autenticado puede envenenar las estadísticas de una URL corta existente con un referente manipulado. Cuando un administrador o un visor de la página de estadísticas pública abre la página de estadísticas afectada, el JavaScript controlado por el atacante se ejecuta en el origen de YOURLS y puede acceder a datos visibles para el administrador, el token de firma de la API y acciones privilegiadas del mismo origen. Este problema está corregido en la versión 1.10.4. -
CVE Modified by [email protected]
Aug. 26, 2026
Action Type Old Value New Value Added Reference https://github.com/YOURLS/YOURLS/commit/e1e93476655107e6caab34e52259eb1c91079ec7 Added Reference https://github.com/YOURLS/YOURLS/pull/4107 Added Reference https://github.com/YOURLS/YOURLS/releases/tag/1.10.4 Added Reference https://github.com/YOURLS/YOURLS/security/advisories/GHSA-5h77-88j3-r659 Removed Reference https://github.com/YOURLS/YOURLS/commit/e1e93476655107e6caab34e52259eb1c91079ec7 Removed Reference https://github.com/YOURLS/YOURLS/pull/4107 Removed Reference https://github.com/YOURLS/YOURLS/releases/tag/1.10.4 Removed Reference https://github.com/YOURLS/YOURLS/security/advisories/GHSA-5h77-88j3-r659 -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Aug. 26, 2026
Action Type Old Value New Value Added Reference https://github.com/YOURLS/YOURLS/security/advisories/GHSA-5h77-88j3-r659 Added SSVC {'id': 'CVE-2026-63135', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-08-26T17:40:19.146156Z'} -
New CVE Received by [email protected]
Aug. 21, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'YOURLS', 'product': 'YOURLS', 'versions': [{'status': 'affected', 'version': '>= 1.5.1, < 1.10.4'}]}] Added 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:N Added CWE CWE-79 Added Reference https://github.com/YOURLS/YOURLS/commit/e1e93476655107e6caab34e52259eb1c91079ec7 Added Reference https://github.com/YOURLS/YOURLS/pull/4107 Added Reference https://github.com/YOURLS/YOURLS/releases/tag/1.10.4 Added Reference https://github.com/YOURLS/YOURLS/security/advisories/GHSA-5h77-88j3-r659