CVE-2021-3258

Name: CVE-2021-3258
Creator: NVD / NIST
Published: 2021-02-05T16:15:12.757+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 1.64%

Last modified Jun 17, 2026

CVE-2021-3258 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. Question2Answer Q2A Ultimate SEO Version 1.3 is affected by cross-site scripting (XSS), which may lead to arbitrary remote code execution.. EPSS estimates a 1.64% chance of exploitation in the next 30 days.

Description

Question2Answer Q2A Ultimate SEO Version 1.3 is affected by cross-site scripting (XSS), which may lead to arbitrary remote code execution.

Metrics

CVSS 3.1

5.4/10

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

EPSS Probability

1.64%

73.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Qa-Themes	Q2a Ultimate Seo	1.3

References

https://github.com/q2a-projects/Q2A-Ultimate-SEO/commit/20069f28147c6f2c3acca4e3f6f5154537c5d536Patch, Third Party Advisory
https://nirmaldahal.com.np/sxss-to-defacement-and-account-takeover/Exploit, Third Party Advisory
https://www.question2answer.org/qa/58520/important-q2a-ultimate-seo-important-updateRelease Notes, Vendor Advisory
https://github.com/q2a-projects/Q2A-Ultimate-SEO/commit/20069f28147c6f2c3acca4e3f6f5154537c5d536Patch, Third Party Advisory
https://nirmaldahal.com.np/sxss-to-defacement-and-account-takeover/Exploit, Third Party Advisory
https://www.question2answer.org/qa/58520/important-q2a-ultimate-seo-important-updateRelease Notes, Vendor Advisory

Timeline

Published: Feb 5, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3258?

Question2Answer Q2A Ultimate SEO Version 1.3 is affected by cross-site scripting (XSS), which may lead to arbitrary remote code execution.

How severe is CVE-2021-3258?

CVE-2021-3258 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 1.64% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3258?

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-2021-3258?

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

Scan your code now

Source: NVD / NIST