High 7.2Published Jan 16, 2026

CVE-2021-47839Marky 0.0.1 - Persistent Cross-Site Scripting

Updated under an hour ago (Oct 27, 2026, 11:30 AM ET)

Does this affect you?

It affects vesparny Marky and 2 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for vesparny Marky

Exploited in the last 30 days

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: 7.2 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Weakness (CWE): CWE-79
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Deferred
Record last updated: Jul 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

vesparny Marky vesparny:marky (from the name)	0.0.1	CNA record
Red Hat Logging Subsystem for Red Hat OpenShift redhat:logging	5	CISA ADP
Red Hat Red Hat Satellite 6 redhat:satellite	6	CISA ADP

References

References

https://www.exploit-db.com/exploits/49831	exploit
https://github.com/vesparny/marky	product
https://imgur.com/a/qclfrUx	exploit
https://www.vulncheck.com/advisories/marky-persistent-cross-site-scripting	third-party-advisory
https://access.redhat.com/security/cve/CVE-2021-47839
https://bugzilla.redhat.com/show_bug.cgi?id=2430451
https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47839.json

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.