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2.1

Deep Chat 2.5.1 lets malicious links run code

CVE-2026-108852 · published 7 days ago
Summary

The Deep Chat version 2.5.1 web interface does not properly check links written in Markdown, so an attacker can insert a link that runs JavaScript when someone clicks it. This can happen in AI responses, user messages, or imported conversation history, potentially giving the attacker control over the page you are viewing. Update to a patched version or apply a filter that blocks JavaScript links to protect your users.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
ovidijusparsiunas deep chat <= 2.5.1
Original advisory text
Deep Chat through 2.5.1 XSS via Markdown Link Validation Bypass
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.
References
Fix within
Internet-facing 60 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker partial control
Severity
2.1 Low
Exploitation
<1% chance of attack within 30 days
Type
CWE-79Cross-site Scripting (XSS)
Timeline
Published11 Oct 2026
Updated16 Oct 2026
First seen11 Oct 2026
Sources
CVE-2026-108852 · NVD
CVE-2026-108852 · MITRE
CVE-2026-108852 · OSV
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