vesparny Marky 0.0.1 Markdown File cross site scripting

Summaryinfo

A vulnerability has been found in vesparny Marky 0.0.1 and classified as problematic. Affected is an unknown function of the component Markdown File Handler. This manipulation causes cross site scripting. The identification of this vulnerability is CVE-2021-47839. It is possible to initiate the attack remotely. Furthermore, there is an exploit available.

Detailsinfo

A vulnerability classified as problematic was found in vesparny Marky 0.0.1. Affected by this vulnerability is an unknown part of the component Markdown File Handler. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. The summary by CVE is:

Marky 0.0.1 contains a persistent cross-site scripting vulnerability that allows attackers to inject malicious scripts into markdown files. Attackers can upload crafted markdown files with embedded JavaScript payloads that execute when the file is opened, potentially enabling remote code execution.

The weakness was shared by TaurusOmar as 49831. It is possible to read the advisory at exploit-db.com. This vulnerability is known as CVE-2021-47839 since 01/14/2026. The exploitation appears to be easy. The attack can be launched remotely. It demands that the victim is doing some kind of user interaction. Technical details are unknown but a public exploit is available. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

It is possible to download the exploit at exploit-db.com. It is declared as proof-of-concept.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at Exploit-DB (49831). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

• vesparny

Name

• Marky

Version

• 0.0.1

CPE 2.3info

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CPE 2.2info

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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