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CVE-2026-108852— Deep Chat through 2.5.1 XSS via Markdown Link Validation Bypass

Quick assessment

Affected
OvidijusParsiunas Deep Chat
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.

Deep Chat 2.5.1 版本存在跨站脚本（XSS）漏洞，攻击者可注入 协议的链接，原因是 禁用了 Remarkable 的链接验证功能。攻击者可在 AI 响应内容、 内容或已加载的历史记录中构造恶意 Markdown 链接；当受害者点击这些链接时，将在嵌入页面中执行恶意脚本。

CVSS 4.7 · Medium EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise

Affected Version Matrix 1

VendorProduct Version RangeStatus
OvidijusParsiunas Deep Chat 1.4.7≤ 2.5.1 affected
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I. Basic Information for CVE-2026-108852

Vulnerability Information
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Vulnerability Title
Deep Chat through 2.5.1 XSS via Markdown Link Validation Bypass
Source: CVE Program / CVE List V5
Vulnerability Description
Deep Chat through 2.5.1 contains a cross-site scripting vulnerability that allows attackers to inject javascript: links because RemarkableConfig.createNew disables Remarkable link validation. Attackers can place crafted Markdown links in AI responses, addMessage content, or loaded history to execute script in the embedding page when victims click them.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/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
OvidijusParsiunas Deep Chat 1.4.7 ~ 2.5.1 -

II. Public POCs for CVE-2026-108852

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-108852

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Patches & Fixes for CVE-2026-108852 (1)

Vendor Advisories for CVE-2026-108852 (1)

Security Blog Posts for CVE-2026-108852 (1)

IV. Related Vulnerabilities

Same weakness: CWE-79

V. Comments for CVE-2026-108852

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