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CVE-2026-108852

Status: DeferredLow (2.1)—
Severity2.1Low · CVSS 4.0
Exploitation probability0.18 %higher than 8% of CVEs
Active exploitationNonot in the CISA catalog
Public exploitNot knownno public code found

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.

CVSS

Base score
2.1
Version
4.0
Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days
0.18 %
Percentile among all scored CVEs
8
Score date
10/20/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

XSS via Markdown links en aplicación web (CWE-79, UI:A); ejecuta JavaScript en navegador cuando la víctima hace clic en enlace malicioso insertado en respuestas o historial.

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

ATT&CK mitigations that cover these techniques

Restrict Web-Based ContentUser TrainingExecution PreventionBehavior Prevention on EndpointDisable or Remove Feature or ProgramApplication Isolation and Sandboxing

Affected technologies (1)

⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.

Deep Chat — Deep ChatAI

CWEs

References

Show 4 references

Raw JSON (NVD)

Show
{
  "id": "CVE-2026-108852",
  "cveTags": [],
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          "version": "2.0.3",
          "timestamp": "2026-10-13T15:49:27.731577Z"
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          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
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      "affectedData": [
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          "repo": "https://github.com/OvidijusParsiunas/deep-chat",
          "vendor": "OvidijusParsiunas",
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      "url": "https://github.com/OvidijusParsiunas/deep-chat",
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    {
      "url": "https://github.com/OvidijusParsiunas/deep-chat/blob/2.5.1/component/src/views/chat/messages/remarkable/remarkableConfig.ts#L74-L78",
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      "url": "https://hackmd.io/@1ExmmukzRMWN7B4gQ4W-4Q/ovidijusparsiunas-deep-chat-markdown-scheme-validation",
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      "lang": "en",
      "value": "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."
    }
  ],
  "lastModified": "2026-10-16T19:18:44.867",
  "sourceIdentifier": "disclosure@vulncheck.com"
}