---
id: CVE-2026-63135
title: 'YOURLS is a self-hosted, customizable URL shortener written in PHP'
summary: >-
  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 …
severity: high
cvss: 8.2
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:N'
cwe:
  - CWE-79
vendor: yourls
product: yourls/yourls
affected:
  - 'yourls/yourls >= 1.5.1, <= 1.10.3'
patched:
  - yourls/yourls 1.10.4
published: '2026-08-21'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T21:06:39.057'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-63135'
references:
  - url: >-
      https://github.com/YOURLS/YOURLS/commit/e1e93476655107e6caab34e52259eb1c91079ec7
    label: security-advisories@github.com
  - url: 'https://github.com/YOURLS/YOURLS/pull/4107'
    label: security-advisories@github.com
  - url: 'https://github.com/YOURLS/YOURLS/releases/tag/1.10.4'
    label: security-advisories@github.com
  - url: 'https://github.com/YOURLS/YOURLS/security/advisories/GHSA-5h77-88j3-r659'
    label: security-advisories@github.com
  - url: 'https://github.com/YOURLS/YOURLS/security/advisories/GHSA-5h77-88j3-r659'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://github.com/advisories/GHSA-5h77-88j3-r659'
tags:
  - nvd
  - ghsa
  - composer
epss: 0.00425
epssPercentile: 0.34069
aliases:
  - GHSA-5h77-88j3-r659
ecosystem: composer
ingestedAt: '2026-08-21T21:22:19.393Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-63135)

Affected packages:

- `yourls/yourls >= 1.5.1, <= 1.10.3`

Patched in:

- `yourls/yourls 1.10.4`

Source: https://github.com/advisories/GHSA-5h77-88j3-r659