What’s Vulnerable › Vulnerabilities

CVE-2021-26835

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-06-18 · updated 2026-06-17
• Weakness: CWE-79

Description

No filtering of cross-site scripting (XSS) payloads in the markdown-editor in Zettlr 1.8.7 allows attackers to perform remote code execution via a crafted file.

Affected products

• Zettlr: 1.8.7

References

• https://github.com/Zettlr/Zettlr/issues/1716
• https://github.com/Zettlr/Zettlr/releases/tag/v1.8.9
• https://github.com/Zettlr/Zettlr/issues/1716
• https://github.com/Zettlr/Zettlr/releases/tag/v1.8.9

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