Cross-Site Scripting Vulnerability in Typora's Mermaid Rendering Component
CVE-2026-82805

5.3MEDIUM

Key Information:

Vendor

Typora

Status
Typora
Vendor
CVE Published:
31 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-82805?

A cross-site scripting vulnerability exists in Typora versions up to 1.13.8 and 1.14.6, affecting the Mermaid Rendering Engine. This flaw allows for the manipulation of the classDef/style argument, which can be exploited remotely. The vulnerability has been publicly disclosed, and users are advised to upgrade to version 1.14.8, where this issue has been addressed. The vendor responded promptly to the issue, showcasing their commitment to security.

Affected Version(s)

Typora 1.13.0

Typora 1.13.1

Typora 1.13.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-82805 - Proof of Concept

References

https://vuldb.com/vuln/397225
vdb-entrytechnical-description
https://vuldb.com/vuln/397225/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-82805
third-party-advisory

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

z0ng (VulDB User)
VulDB CNA Team
.