CVE-2021-47839

Marky 0.0.1 - Persistent Cross-Site Scripting

HIGH
7.2
CVSS Score
Published: January 16, 2026 at 07:09 PM UTC
Updated: July 15, 2026 at 02:17 AM UTC
2 products affected across 2 vendorsMarkyMarky

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Severity
HIGH7.2
Exploit prediction
EPSS 0.5%
SSVC
PoC

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (7)

Product
Source: cverecord
https://github.com/vesparny/marky
Exploit
Source: cverecord
https://imgur.com/a/qclfrUx
Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/security/cve/CVE-2021-47839
Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://bugzilla.redhat.com/show_bug.cgi?id=2430451

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.2HIGHVulnCheck
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-79

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