CVE-2024-33300Public exploitNetwork attack vector

Code execution via data-URL iframe rendering

Published May 1, 2024 · Updated Aug 2, 2024

Cross-site scripting in Typora 1.0.0 through 1.7.0 allows attackers to execute code when a crafted Markdown document is rendered. The live Markdown preview renders an iframe whose data:text/html URL embeds a script payload without neutralizing the active content. The payload must be placed in a Markdown document processed by the desktop editor; successful exploitation runs script in its rendering context.

CVSS severity7.3
High
EPSS probability0.55%
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 Typora 1.0.0 through 1.7.0 allows attackers to execute code when a crafted Markdown document is rendered. The live Markdown preview renders an iframe whose data:text/html URL embeds a script payload without neutralizing the active content. The payload must be placed in a Markdown document processed by the desktop editor; successful exploitation runs script in its rendering context.

The record

CVE
CVE-2024-33300
Published
May 1, 2024
Updated
Aug 2, 2024
Vendor
Qiyun (Shanghai) Technology Ltd.
Product
Typora
Classifications
CWE-79, T1204.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 1, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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=*

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Qiyun (Shanghai) Technology Ltd. · Typoraversion=*

Published CVSS scores

7.3CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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')
T1204.002User Execution: Malicious File

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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