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CVE-2026-48822— Shaarli has Stored Cross-Site Scripting (XSS) via Markdown Reference Links

Quick assessment

Affected
shaarli Shaarli
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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社区开源的一套网站克隆工具。 Shaarli Community shaarli 0.16.2之前版本存在跨站脚本漏洞，该漏洞源于BookmarkMarkdownFormatter.php中的filterProtocols方法在处理Markdown引用样式链接时未能正确过滤javascript: URI，可能导致存储型跨站脚本漏洞。

CVSS 5.8 · Medium EPSS 0.17% · P6

Affected Version Matrix 1

VendorProduct Version RangeStatus
shaarli Shaarli < 0.16.2 affected
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I. Basic Information for CVE-2026-48822

Vulnerability Information
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Vulnerability Title
Shaarli has Stored Cross-Site Scripting (XSS) via Markdown Reference Links
Source: CVE Program / CVE List V5
Vulnerability Description
Shaarli is a personal bookmarking service. Versions 0.16.1 and prior contain a stored Cross-Site Scripting (XSS) vulnerability in the Markdown-to-HTML conversion process used in the Bookmark Description field. An authenticated user can inject a malicious javascript: URI inside a Markdown link. The vulnerability originates in the filterProtocols method within BookmarkMarkdownFormatter.php.This method attempts to sanitize Markdown links by filtering dangerous protocols (such as javascript:) before rendering. It uses the following regular expression: (#]\((.*?)\)#is). This regex is designed to detect inline Markdown links, but it fails to detect Markdown reference-style links because reference-style links are resolved by the Markdown parser after preprocessing. The filterProtocols method never inspects the actual URL used in these references and as a result, an attacker can supply a javascript: URI inside a reference definition. This issue has been fixed in version 0.16.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:H/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
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社区开源的一套网站克隆工具。 Shaarli Community shaarli 0.16.2之前版本存在跨站脚本漏洞，该漏洞源于BookmarkMarkdownFormatter.php中的filterProtocols方法在处理Markdown引用样式链接时未能正确过滤javascript: URI，可能导致存储型跨站脚本漏洞。
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 < 0.16.2 -

II. Public POCs for CVE-2026-48822

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III. Intelligence Information for CVE-2026-48822

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Vendor Advisories for CVE-2026-48822 (1)

Vendor Pages for CVE-2026-48822 (1)

Same Patch Batch · shaarli · 2026-06-17 · 3 CVEs total

CVE-2026-48821 5.8 MEDIUM Shaarli: DOM-based Cross-Site Scripting (XSS) in Thumbnail Synchronizer
CVE-2026-48823 4.8 MEDIUM Shaarli has Stored Cross-Site Scripting (XSS) via Tags Search

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-48822

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