CVE-2021-47838

Markright 1.0 contains a persistent cross-site scripting vulnerability that allows attackers to embed malicious payloads in markdown files. Attackers can upload specially crafted markdown files that execute arbitrary JavaScript when opened, potentially enabling remote code execution on the victim's system.

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

0.42% chance of exploitation in the next 30 days, 35th percentile

Published

2026-01-16

Proof-of-concept exploits (2)

• https://www.exploit-db.com/exploits/49834
• https://imgur.com/a/VOsgKbZ

References

• CVE Record
• NVD entry

Related

• CVE-2021-47837
• CVE-2021-47839
• CVE-2021-47836
• CVE-2021-47840
• CVE-2021-47835
• CVE-2021-47841