CVE-2026-82805Public exploitNetwork attack vector

Command execution via unsanitized Mermaid styles

Published Aug 31, 2026 · Updated Aug 31, 2026

Cross-site scripting in Typora 1.13.0 through 1.13.8 and 1.14.0 through 1.14.6 allows attackers to execute commands via crafted Markdown. Mermaid style values accept a closing style tag and are concatenated into CSS written through innerHTML without encoding; loose rendering skips final sanitization. Opening the malicious file triggers injected JavaScript, which can reach the exposed Node.js require function and launch child processes.

CVSS severityUnavailable
Unscored
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Cross-site scripting in Typora 1.13.0 through 1.13.8 and 1.14.0 through 1.14.6 allows attackers to execute commands via crafted Markdown. Mermaid style values accept a closing style tag and are concatenated into CSS written through innerHTML without encoding; loose rendering skips final sanitization. Opening the malicious file triggers injected JavaScript, which can reach the exposed Node.js require function and launch child processes.

The record

CVE
CVE-2026-82805
Published
Aug 31, 2026
Updated
Aug 31, 2026
Vendor
Qiyun (Shanghai) Technology Ltd.
Product
Typora
Classifications
CWE-94, CWE-79, T1059.007, T1204.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 31, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 31, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=1.13.0
  2. Affected versionversion=1.13.1
  3. Affected versionversion=1.13.2
  4. Affected versionversion=1.13.3
  5. Affected versionversion=1.13.4
  6. Affected versionversion=1.13.5
  7. Affected versionversion=1.13.6
  8. Affected versionversion=1.13.7
  9. Affected versionversion=1.13.8
  10. Affected versionversion=1.14.0
  11. Affected versionversion=1.14.1
  12. Affected versionversion=1.14.2
  13. Affected versionversion=1.14.3
  14. Affected versionversion=1.14.4
  15. Affected versionversion=1.14.5
  16. Affected versionversion=1.14.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Qiyun (Shanghai) Technology Ltd. · Typoraversion=1.13.0; version=1.13.1; version=1.13.2; version=1.13.3; version=1.13.4; version=1.13.5; version=1.13.6; version=1.13.7; version=1.13.8; version=1.14.0; version=1.14.1; version=1.14.2; version=1.14.3; version=1.14.4; version=1.14.5; version=1.14.6

Published CVSS scores

4.3VulDB CNACVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N/E:P/RL:O/RC:C
5.3VulDB CNACVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P
5.0VulDB CNAAV:N/AC:L/Au:N/C:N/I:P/A:N/E:POC/RL:OF/RC:C
4.3VulDB CNACVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N/E:P/RL:O/RC:C

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 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-94Improper Control of Generation of Code ('Code Injection')
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript
T1204.002Malicious File

Public exploit references

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo