Vulnerability identifier: #VU55867

Vulnerability risk: Low

CVSSv3.1: 5.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-37916

CWE-ID: CWE-79

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Joplin
Client/Desktop applications / Software for archiving

Vendor: Joplinapp

Description

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data within the "button" and "form" in the note body. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Joplin: 2.0.1 - 2.0.8

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External links
http://github.com/laurent22/joplin/commit/feaecf765368f2c273bea3a9fa641ff0da7e6b26
http://github.com/laurent22/joplin/releases/tag/v2.0.9

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.