CVE-2021-21043

Name: CVE-2021-21043
Creator: NVD / NIST
Published: 2021-02-02T23:15:12.813+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 3.34%

Last modified Jun 17, 2026

CVE-2021-21043 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. ACS Commons version 4.9.2 (and earlier) suffers from a Reflected Cross-site Scripting (XSS) vulnerability in version-compare and page-compare due to invalid JCR characters that are not handled correctly. An attacker could potentially exploit this vulnerability to inject malicious JavaScript content into vulnerable form fields and execute it within the context of the victim's browser. EPSS estimates a 3.34% chance of exploitation in the next 30 days.

Description

ACS Commons version 4.9.2 (and earlier) suffers from a Reflected Cross-site Scripting (XSS) vulnerability in version-compare and page-compare due to invalid JCR characters that are not handled correctly. An attacker could potentially exploit this vulnerability to inject malicious JavaScript content into vulnerable form fields and execute it within the context of the victim's browser. Exploitation of this issue requires user interaction in order to be successful.

Metrics

CVSS 3.1

6.1/10

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

EPSS Probability

3.34%

87.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Adobe	Adobe Consulting Services Commons	<= 4.9.2

References

https://github.com/Adobe-Consulting-Services/acs-aem-commons/security/advisories/GHSA-f92j-qf46-p6vmThird Party Advisory
https://github.com/Adobe-Consulting-Services/acs-aem-commons/security/advisories/GHSA-f92j-qf46-p6vmThird Party Advisory

Timeline

Published: Feb 2, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-21043?

How severe is CVE-2021-21043?

CVE-2021-21043 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 3.34% probability of exploitation in the next 30 days.

How do I fix CVE-2021-21043?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-21043?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST