Cross-site scripting in Deep Chat via Markdown links
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Active
- Attack complexity
- Low
- Attack requirements
- Present
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- None · None · None
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-79.
Summary
Deep Chat from 1.4.7 through 2.5.1 contains a cross-site scripting flaw (CWE-79). Its Markdown link validation is disabled, so javascript: links are not filtered out of rendered content. An unauthenticated remote attacker can place a crafted Markdown link in AI responses, addMessage content, or loaded history, and script runs in the embedding page when a victim clicks it.
Written with Claude Haiku 5.5 from the sources below · 2026-10-29
Description from the CNA
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| OvidijusParsiunas | Deep Chat | 1.4.7 – 2.5.1 | — | No fix listed | CNA |
- Deep Chat VendorOvidijusParsiunas Affected 1.4.7 – 2.5.1 Fixed in — No fix listed CNA
Remediation
The sources list no fixed version for Deep Chat.
Written with Claude Haiku 5.5 from the sources below · 2026-10-29
Timeline
- 2026-10-11 Threatist record created from CVE-2026-108852
- 2026-10-11 Alias added: GHSA-qvgf-g4p8-x92p
- 2026-10-13 CISA SSVC decision points changed
References
Sources
- CVE-2026-108852 · CVE Program
- CVE-2026-108852 · NVD
- FIRST EPSS
- GHSA-qvgf-g4p8-x92p · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences