CVE-2026-108852

MEDIUM 4.7

Deep Chat through 2.5.1 XSS via Markdown Link Validation Bypass

CVSS Score

4.7

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-79
Vendor	ovidijusparsiunas
Product	deep chat
Published	Oct 11, 2026

Stay Ahead of the Next One

Get instant alerts for ovidijusparsiunas deep chat

Be the first to know when new medium vulnerabilities affecting ovidijusparsiunas deep chat are published — delivered to Slack, Telegram or Discord.

Get Free Alerts → Free · No credit card · 60 sec setup

CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Affected Versions

OvidijusParsiunas / Deep Chat

1.4.7 ≤ 2.5.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

hackmd.io: https://hackmd.io/@1ExmmukzRMWN7B4gQ4W-4Q/ovidijusparsiunas-deep-chat-markdown-scheme-validation github.com: https://github.com/OvidijusParsiunas/deep-chat/blob/2.5.1/component/src/views/chat/messages/remarkable/remarkableConfig.ts#L74-L78 github.com: https://github.com/OvidijusParsiunas/deep-chat vulncheck.com: https://www.vulncheck.com/advisories/deep-chat-through-2.5.1-xss-via-markdown-link-validation-bypass

Credits

hieuPenguinnn