CVE-2021-47838

5.1 mediumEPSS 0.4%

Medium (5.1). EPSS 0.4% chance of exploitation in the next 30 days.

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.

Severity

CVSS 4.0

5.1 medium

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N

CVSS 3.1

7.2 high

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

EPSS: 0.4% chance of exploitation in the next 30 days; higher than 38% of CVEs (scores of 2026-10-31)
CWE: CWE-79
Published: 2026-01-16
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

References

https://github.com/dvcrn/markright
https://imgur.com/a/VOsgKbZ
https://www.exploit-db.com/exploits/49834
https://www.vulncheck.com/advisories/markright-persistent-cross-site-scripting
https://www.vulncheck.com/advisories/markright-persistent-cross-site-scripting

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