What is CVE-2021-29271?

CVE-2021-29271 is a medium-severity vulnerability in Remark42, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-03-27.

How severe is CVE-2021-29271?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Is CVE-2021-29271 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Remark42

CVE-2021-29271

remark42 before 1.6.1 allows XSS, as demonstrated by "Locator: Locator{URL:" followed by an XSS payload. This is related to backend/app/store/comment.go and backend/app/store/service/service.go.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.008 (52.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Remark42
N/a — versions n/a

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

n0-traces/cve_

References

cve@mitre.org (Patch, Third Party Advisory, x_refsource_MISC)
cve@mitre.org (Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2021-29271?: CVE-2021-29271 is a medium-severity vulnerability in Remark42, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-03-27.
How severe is CVE-2021-29271?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2021-29271 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.