CVE-2021-47839

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.

CVSS v4.0

5.1 MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1

7.2 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

EPSS

0.43% chance of exploitation in the next 30 days, 36th percentile

Published

2026-01-16

Updated

2026-07-15

Proof-of-concept exploits (2)

• https://www.exploit-db.com/exploits/49831
• https://imgur.com/a/qclfrUx

References

• CVE Record
• NVD entry

Related

• CVE-2021-47838
• CVE-2021-47840
• CVE-2021-47837
• CVE-2021-47841
• CVE-2021-47836
• CVE-2021-47842