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TI-2021-22454 Aliases CVE-2021-47839GHSA-j84q-hxmx-jr5m

Marky 0.0.1 - Persistent Cross-Site Scripting

Priority MEDIUM 56CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
Passive
Attack complexity
Low
Attack requirements
None
Impact type
Cross-site scripting
Confidentiality · integrity · availability
Low · Low · None
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00464 40th percentileScored 2026-11-07
Public exploit Yes 2 exploit referencesTagged by the CNA
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
vesparnyMarky0.0.1—No fix listedCNA
  • Marky Vendorvesparny Affected 0.0.1 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

Not affected: 2 products
  • Logging Subsystem for Red Hat OpenShift
  • Red Hat Satellite 6

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-47839
  2. 2026-10-03 Alias added: GHSA-j84q-hxmx-jr5m

References

Exploit 2

Other 1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences