What’s Vulnerable › Vulnerabilities

CVE-2021-20727

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-05-27 · updated 2026-06-17
• Weakness: CWE-79

Description

Cross-site scripting vulnerability in Zettlr from 0.20.0 to 1.8.8 allows an attacker to execute an arbitrary script by loading a file or code snippet containing an invalid iframe into Zettlr.

Affected products

• Zettlr: from 0.20.0 through 1.8.8

References

• https://github.com/Zettlr/Zettlr
• https://jvn.jp/en/jp/JVN98239374/index.html
• https://www.zettlr.com/
• https://github.com/Zettlr/Zettlr
• https://jvn.jp/en/jp/JVN98239374/index.html
• https://www.zettlr.com/

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