VulnerabilityModified
CVE-2021-26835
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.
MEDIUM 6.1EPSS 1.29%
Does this matter?
Lower severity and a low EPSS score (1.29%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 6.1 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- EPSS
- 1.29% probability · 70th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-79
- Affected
- zettlr/zettlr
- Source
- cve@mitre.org
EPSS 1.3% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://github.com/Zettlr/Zettlr/issues/1716Exploit, Issue Tracking, Patch, Third Party Advisory
- https://github.com/Zettlr/Zettlr/releases/tag/v1.8.9Release Notes, Third Party Advisory
- https://github.com/Zettlr/Zettlr/issues/1716Exploit, Issue Tracking, Patch, Third Party Advisory
- https://github.com/Zettlr/Zettlr/releases/tag/v1.8.9Release Notes, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.