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MEDIUM severity

Joplin Cross Site Scripting Vulnerability via NOSCRIPT tagsGHSA-phj8-2p6x-hq5r

MEDIUMFix: laurent22/joplin@9c20d59

GHSA-phj8-2p6x-hq5r is a medium-severity (CVSS 5.4) Cross-site Scripting (XSS) vulnerability in joplin. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for joplin — see the affected versions and patch details below.

Also known asCVE-2021-33295
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Nov 12, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.9%probability of exploitation in next 30 days
Lower Risk+0.01%
Lower risk than most CVEs59th percentile — riskier than 59% of all scored CVEsHighest risk
0.00%0.46%0.91%1.37%0.3%0.9%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

3other npm packages depend on this — each one inherits the vulnerability until it's patched upstream
joplinnpm
2Kdownloads / week

Description

Cross Site Scripting (XSS) vulnerability in Joplin Desktop App before 1.8.5 allows attackers to execute aribrary code due to improper sanitizing of html.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
📦npmjoplinall versions1.8.5npm install joplin@1.8.5

Affected Products

1 product · 1 configurations
Application
joplinjoplin_project
< 1.8.5
range
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

Cross Site Scripting (XSS) vulnerability in Joplin Desktop App before 1.…

the-it-wonders.blogspot.comNVDJun 2022

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for joplin, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update joplin to 1.8.5 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-phj8-2p6x-hq5r is resolved across your whole dependency graph.

  3. Workarounds

    Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

Cross Site Scripting (XSS) vulnerability in Joplin Desktop App before 1.8.5 allows attackers to execute aribrary code due to improper sanitizing of html.
O3 Security · Impact-Aware SCA

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Joplin Cross Site Scripting Vulnerability via NOSCRIPT tags