TI-2022-19117 Aliases CVE-2022-40276 GHSA-gq8w-3h98-m48x

Improper input validation in Zettlr

LOW 25CWE-20Published 2022-11-03 · Updated 2025-05-02

Key facts

Attack vector: Local
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: High · None · None
Fix status: No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA.

Summary

Zettlr version 2.3.0 allows an external attacker to remotely obtain arbitrary local files on any client that attempts to view a malicious markdown file through Zettlr. This is possible because the application does not have a CSP policy (or at least not strict enough) and/or does not properly validate the contents of markdown files before rendering them.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00391 33rd percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	Zettlr	2.3.0	—	No fix listed	CNA

Zettlr Vendor— Affected 2.3.0 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:zettlr:zettlr:2.3.0:::::::*	2.3.0	Vulnerable	Zettlr

cpe:2.3:a:zettlr:zettlr:2.3.0:*:*:*:*:*:*:* Versions 2.3.0 Vulnerable ·Zettlr

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2022-40276
2026-10-03 Alias added: GHSA-gq8w-3h98-m48x

References

Exploit 1

https://fluidattacks.com/advisories/avicii/

Advisory 1

https://github.com/Zettlr/Zettlr

TI-2021-08459 No filtering of cross-site scripting (XSS) payloads in the markdown-editor in Zettlr… CVSS 3.1MEDIUM 6.1
TI-2021-03953 Cross-site scripting in Hendrik Erz Zettlr CVSS 3.1MEDIUM 6.1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences