CVE-2025-56683Public exploitNetwork attack vector

Code execution via unsanitized plugin README rendering

Published Oct 9, 2025 · Updated Oct 9, 2025

DOM-based XSS in Logseq 0.10.9 allows remote attackers to execute code when a crafted plugin README is rendered in the marketplace. The marketplace parses attacker-controlled README Markdown with marked.parse() and assigns the resulting unsanitized HTML to innerHTML. Exploitation requires a user to load the malicious plugin README; injected JavaScript can invoke exposed external-protocol handling to launch native applications.

CVSS severity9.6
Critical
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

DOM-based XSS in Logseq 0.10.9 allows remote attackers to execute code when a crafted plugin README is rendered in the marketplace. The marketplace parses attacker-controlled README Markdown with marked.parse() and assigns the resulting unsanitized HTML to innerHTML. Exploitation requires a user to load the malicious plugin README; injected JavaScript can invoke exposed external-protocol handling to launch native applications.

The record

CVE
CVE-2025-56683
Published
Oct 9, 2025
Updated
Oct 9, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 9, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 9, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.6CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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