CVE-2024-40643Public exploit

Arbitrary code execution via non-letter HTML tag parsing

Published Sep 9, 2024 · Updated Sep 9, 2024

Cross-site scripting in Joplin for Desktop before 3.0.15 allows local users to execute arbitrary code by rendering a crafted note. The forked htmlparser2 Tokenizer treats a less-than sign followed by a non-letter as a tag start, creating a sanitizer and browser parsing mismatch that admits injected tags. User interaction is required to render attacker-controlled note content, after which JavaScript can access Electron's Node context to read local files or execute commands.

CVSS severity8.6
High
EPSS probability0.79%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Joplin for Desktop before 3.0.15 allows local users to execute arbitrary code by rendering a crafted note. The forked htmlparser2 Tokenizer treats a less-than sign followed by a non-letter as a tag start, creating a sanitizer and browser parsing mismatch that admits injected tags. User interaction is required to render attacker-controlled note content, after which JavaScript can access Electron's Node context to read local files or execute commands.

The record

CVE
CVE-2024-40643
Published
Sep 9, 2024
Updated
Sep 9, 2024
Vendor
Joplin Project
Product
Joplin
Classifications
CWE-79, T1204
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 9, 2024CVE publishedPublication date reported by the CVE source.
  2. Sep 9, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <3.0.15
  2. Affected versionversion=< 3.0.15

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Joplin Project · Joplinversion=0 <3.0.15; version=< 3.0.15

Published CVSS scores

8.6GitHubCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
9.6NVDCVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204User 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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