CVE-2021-3258: Question2Answer Q2A Ultimate SEO Version 1.3 is affected by cross-site scripting (XSS), which may lead to arbi

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MEDIUM 5.4DOWNGRADE

CVE-2021-3258 is a medium-severity flaw (CVSS 5.4) affecting q2a ultimate seo. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	1.6% (top 24%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-02-05
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: qa-themes

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-02-05 16:15 UTCPublished CVE record published
2026-06-17 04:04 UTCUpdated Record last modified

qa-themes q2a ultimate seo DOWNGRADE

Affected: 1.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.3

1. Check installed version

apt-cache policy q2a-ultimate-seo || rpm -q q2a-ultimate-seo || q2a-ultimate-seo --version

2. No fixed release: DOWNGRADE to a release before 1.3 (Debian / Ubuntu)

apt-cache madison q2a-ultimate-seo sudo apt install q2a-ultimate-seo=<VERSION_BEFORE_1.3> sudo apt-mark hold q2a-ultimate-seo

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list q2a-ultimate-seo sudo dnf downgrade q2a-ultimate-seo-<VERSION_BEFORE_1.3> sudo dnf versionlock add q2a-ultimate-seo

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-3258?

q2a ultimate seo: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-3258 being exploited?

CVE-2021-3258 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-3258 affect?

CVE-2021-3258 affects q2a ultimate seo. Severity is medium (CVSS 5.4). Question2Answer Q2A Ultimate SEO Version 1.3 is affected by cross-site scripting (XSS), which may lead to arbitrary remote code execution.

How urgent is CVE-2021-3258?

Priority 43/100. Public exploit reference

References

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