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MEDIUM severity

Cross-site scripting in JoplinGHSA-q26w-wjj2-22vv

MEDIUMFix: laurent22/joplin@fd90a49

GHSA-q26w-wjj2-22vv is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in joplin. 2 public exploit references exist, so weaponization risk is real. A fix is available for joplin — see the affected versions and patch details below.

Also known asCVE-2020-28249
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
2 known
Exploitation data as of Oct 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
3.1%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs87th percentile — riskier than 87% of all scored CVEsHighest risk
0.00%1.28%2.57%3.85%0.4%3.1%Apr 26Aug 26Oct 26

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

How urgent is this, really

GHSA-q26w-wjj2-22vv by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,386 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

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
1Kdownloads / week

Description

Joplin 1.2.6 for Desktop allows XSS via a LINK element in a note.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
📦npmjoplinall versions1.3.11npm install joplin@1.3.11

Affected Products

1 product · 1 configurations
Application
joplinjoplin_project
1 version
1.2.6
Exploits & PoCs
2

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

EDB-49024webappsmultiple

Joplin 1.2.6 - 'link' Cross Site Scripting

by Philip Holbrook · Nov 9, 2020

Exploit-DB Source

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 1.3.11 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-q26w-wjj2-22vv 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

Joplin allows XSS via a LINK element in a note.
O3 Security · Impact-Aware SCA

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Cross-site scripting in Joplin (Medium 6.1)