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CVE-2026-50190— Shaarli vulnerable to stored XSS via raw bookmark title in document <title> element on public permalink page

Quick assessment

Affected
shaarli Shaarli
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.

Shaarli Community Shaarli是Shaarli Community社区开源的一款个人书签管理工具。 Shaarli Community Shaarli 0.16.3之前版本存在跨站脚本漏洞，该漏洞源于在文件application/front/controller/visitor/BookmarkListController.php中，permalink处理程序将原始书签标题拼接到pagetitle模板变量，且RainTPL模板未进行HTML转义，可能导致存储型跨站脚本攻击，攻击者可通过

CVSS 8.6 · High EPSS 0.44% · P36

Affected Version Matrix 1

VendorProduct Version RangeStatus
shaarli Shaarli < 0.16.3 affected
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I. Basic Information for CVE-2026-50190

Vulnerability Information
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Vulnerability Title
Shaarli vulnerable to stored XSS via raw bookmark title in document <title> element on public permalink page
Source: CVE Program / CVE List V5
Vulnerability Description
Shaarli is a personal bookmarking service. Versions prior to 0.16.3 are vulnerable to stored XSS in `application/front/controller/visitor/BookmarkListController.php`. The `permalink` handler concatenates the raw `$bookmark->getTitle()` into the `pagetitle` template variable and the RainTPL template emits it into the document `<title>` element without HTML escaping. A bookmark title containing `</title><script>...</script>` closes the document title early and the injected script executes in the Shaarli origin for any visitor of `/shaare/{hash}`. Shaarli's metadata fetcher copies a remote page's `<title>` text verbatim into the local bookmark title, so an attacker who hosts an attacker-controlled URL and convinces an administrator to bookmark it plants the payload with no further interaction — and the resulting permalink fires for every visitor including the administrator on first save, providing a one-shot administrator account takeover. Version 0.16.3 fixes the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:L/SC:N/SI:N/SA: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
Vulnerability Title
Shaarli Community Shaarli 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Shaarli Community Shaarli是Shaarli Community社区开源的一款个人书签管理工具。 Shaarli Community Shaarli 0.16.3之前版本存在跨站脚本漏洞，该漏洞源于在文件application/front/controller/visitor/BookmarkListController.php中，permalink处理程序将原始书签标题拼接到pagetitle模板变量，且RainTPL模板未进行HTML转义，可能导致存储型跨站脚本攻击，攻击者可通过
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
shaarli Shaarli < 0.16.3 -

II. Public POCs for CVE-2026-50190

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Reproduced successfully in a real sandbox · Below is the actual recording of building the environment and exploiting the vulnerability.
Success marker: VULNERABLE: unescaped bookmark title in <title> — injected <script> present in raw HTML: </title><script>document.write("PROOF_aef707c72ac85250")</script>
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III. Intelligence Information for CVE-2026-50190

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Vendor Advisories for CVE-2026-50190 (1)

IV. Related Vulnerabilities

Same product: Shaarli
Same vendor: shaarli
Same weakness: CWE-79

V. Comments for CVE-2026-50190

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