Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-48821— Shaarli: DOM-based Cross-Site Scripting (XSS) in Thumbnail Synchronizer

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 0.16.1及之前版本存在跨站脚本漏洞，该漏洞源于Thumbnail Synchronizer功能中未对AJAX响应中的书签标题进行清理，直接通过innerHTML插入DOM，可能导致管理员用户受跨站脚本攻击，进而造成会话劫持、权限提升、后门注入和完全破解。以下版本受到影响：0.16.1及之前版本。

CVSS 5.8 · Medium EPSS 0.18% · P7

Affected Version Matrix 1

VendorProduct Version RangeStatus
shaarli Shaarli < 0.16.2 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-48821

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Shaarli: DOM-based Cross-Site Scripting (XSS) in Thumbnail Synchronizer
Source: CVE Program / CVE List V5
Vulnerability Description
Shaarli is a personal bookmarking service. Versions 0.16.1 and prior contain a DOM-based Cross-Site Scripting (XSS) vulnerability in the Thumbnail Synchronizer feature. When an administrator runs the thumbnail update process, malicious bookmark titles are returned via an AJAX response and inserted into the DOM using innerHTML without proper sanitization. The issue originates from the interaction between the backend thumbnail update endpoint and the frontend JavaScript responsible for rendering update progress. On the backend, the ThumbnailsController::ajaxUpdate method returns bookmark data formatted using the 'raw' formatter. This includes the unescaped bookmark title in the JSON response. On the client side, the script thumbnails-update.js processes this AJAX response and dynamically updates the progress interface. Administrators using the thumbnail synchronization feature are affected and exploitation could lead to session hijacking, privilege escalation, backdoor injection and full compromise. 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 0.16.1及之前版本存在跨站脚本漏洞，该漏洞源于Thumbnail Synchronizer功能中未对AJAX响应中的书签标题进行清理，直接通过innerHTML插入DOM，可能导致管理员用户受跨站脚本攻击，进而造成会话劫持、权限提升、后门注入和完全破解。以下版本受到影响：0.16.1及之前版本。
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-2026-48821

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-48821

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-48821 (1)

Vendor Pages for CVE-2026-48821 (1)

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

CVE-2026-48822 5.8 MEDIUM Shaarli has Stored Cross-Site Scripting (XSS) via Markdown Reference Links
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-2026-48821

No comments yet

Leave a comment