CVE-2022-40276: Zettlr version 2.3.0 allows an external attacker to remotely obtain arbitrary local files on any client that a

Routine

MEDIUM 5.5DOWNGRADE

CVE-2022-40276 is a medium-severity flaw (CVSS 5.5) affecting zettlr. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.4% (top 68%)
CISA exploited list	No
Weakness	CWE-20
Published	2022-11-03
Last modified	2026-06-17

Publisher (CNA): Fluid Attacks · Vendor: zettlr

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-11-03 20:15 UTCPublished CVE record published
2026-06-17 05:01 UTCUpdated Record last modified

zettlr zettlr DOWNGRADE

Affected: 2.3.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.3.0

1. Check installed version

apt-cache policy zettlr || rpm -q zettlr || zettlr --version

2. No fixed release: DOWNGRADE to a release before 2.3.0 (Debian / Ubuntu)

apt-cache madison zettlr sudo apt install zettlr=<VERSION_BEFORE_2.3.0> sudo apt-mark hold zettlr

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list zettlr sudo dnf downgrade zettlr-<VERSION_BEFORE_2.3.0> sudo dnf versionlock add zettlr

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2022-40276?

zettlr: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2022-40276 being exploited?

CVE-2022-40276 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2022-40276 affect?

CVE-2022-40276 affects zettlr. Severity is medium (CVSS 5.5). 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

How urgent is CVE-2022-40276?

Priority 32/100. Public exploit reference

Related CVEs

CVE-2021-26835 MEDIUM 6.1 DOWNGRADE No filtering of cross-site scripting (XSS) payloads in the markdown-editor in Zettlr 1.8.7 allows attackers to
CVE-2021-20727 MEDIUM 6.1 UPGRADE Cross-site scripting vulnerability in Zettlr from 0.20.0 to 1.8.8 allows an attacker to execute an arbitrary s

References

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