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CVE-2026-63135— YOURLS: Stored XSS in referrer statistics chart via crafted Referer header

Quick assessment

Affected
YOURLS YOURLS
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

YOURLS 是一个自托管、可定制的 URL 短链接服务，采用 PHP 编写。从版本 1.5.1 至 1.10.4，YOURLS 会通过 yourls_get_referrer()、yourls_sanitize_url_safe() 以及 yourls_log_redirect() 函数存储 HTTP Referer 头信息，随后在 yourls-infos.php 中对这些值进行汇总聚合，并通过 yourls_get_domain()、yourls_stats_pie() 和 yourls_google_arr

CVSS 8.2 · High EPSS 0.25% · P16

Affected Version Matrix 1

VendorProduct Version RangeStatus
YOURLS YOURLS >= 1.5.1, < 1.10.4 affected
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I. Basic Information for CVE-2026-63135

Vulnerability Information
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Vulnerability Title
YOURLS: Stored XSS in referrer statistics chart via crafted Referer header
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
YOURLS YOURLS >= 1.5.1, < 1.10.4 -

II. Public POCs for CVE-2026-63135

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 7930 chars
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III. Intelligence Information for CVE-2026-63135

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Patches & Fixes for CVE-2026-63135 (2)

Vendor Advisories for CVE-2026-63135 (1)

Vendor Pages for CVE-2026-63135 (1)

IV. Related Vulnerabilities

Same vendor: YOURLS
Same weakness: CWE-79

V. Comments for CVE-2026-63135

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