CVE-2018-13433: Boostnote v0.11.7 allows XSS during highlighting of Markdown text, as demonstrated by an onerror attribute of

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MEDIUM 6.1DOWNGRADE

CVE-2018-13433 is a medium-severity flaw (CVSS 6.1) affecting boostnote. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Boostnote v0.11.7 allows XSS during highlighting of Markdown text, as demonstrated by an onerror attribute of an IMG element.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.9% (top 41%)
CISA exploited list	No
Weakness	CWE-79
Published	2018-07-08
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: boostnote

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

Am I affected?

Timeline

2018-07-08 12:29 UTCPublished CVE record published
2026-06-17 01:39 UTCUpdated Record last modified

boostnote boostnote DOWNGRADE

Affected: 0.11.7

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.11.7

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.11.7 (Debian / Ubuntu)

apt-cache madison boostnote sudo apt install boostnote=<VERSION_BEFORE_0.11.7> sudo apt-mark hold boostnote

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

dnf --showduplicates list boostnote sudo dnf downgrade boostnote-<VERSION_BEFORE_0.11.7> sudo dnf versionlock add boostnote

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-2018-13433?

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

Is CVE-2018-13433 being exploited?

CVE-2018-13433 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-2018-13433 affect?

CVE-2018-13433 affects boostnote. Severity is medium (CVSS 6.1). Boostnote v0.11.7 allows XSS during highlighting of Markdown text, as demonstrated by an onerror attribute of an IMG element.

How urgent is CVE-2018-13433?

Priority 41/100. Public exploit reference

Related CVEs

CVE-2021-41392 CRITICAL 9.8 UPGRADE static/main-preload.js in Boost Note through 0.22.0 allows remote command execution
CVE-2020-19924 MEDIUM 5.4 DOWNGRADE In Boostnote 0.12.1, exporting to PDF contains opportunities for XSS attacks.
CVE-2019-12184 MEDIUM 5.4 DOWNGRADE There is XSS in browser/components/MarkdownPreview.js in BoostIO Boostnote 0.11.15 via a label named flowchart
CVE-2019-12136 MEDIUM 5.4 DOWNGRADE There is XSS in BoostIO Boostnote 0.11.15 via a label named mermaid, as demonstrated by a crafted SRC attribut

References

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