How severe is CVE-2026-42663?

CVE-2026-42663 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2026-42663 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-42663?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-42663 have an EU (EUVD) identifier?

Yes. CVE-2026-42663 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36828.

When was CVE-2026-42663 published?

CVE-2026-42663 was published on 2026-06-15 and last updated on 2026-06-17.

CVE-2026-42663

CVE-2026-42663 is a medium-severity vulnerability with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (6th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-36828
Weakness: CWE-79
Published: 2026-06-15
Last modified: 2026-06-17

Description

Unauthenticated Cross Site Scripting (XSS) in Simple Membership <= 4.7.2 versions.

Frequently asked questions

What is CVE-2026-42663?: Unauthenticated Cross Site Scripting (XSS) in Simple Membership <= 4.7.2 versions.
How severe is CVE-2026-42663?: CVE-2026-42663 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2026-42663 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-42663?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-42663 have an EU (EUVD) identifier?: Yes. CVE-2026-42663 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36828.
When was CVE-2026-42663 published?: CVE-2026-42663 was published on 2026-06-15 and last updated on 2026-06-17.

References

https://patchstack.com/database/wordpress/plugin/simple-membership/vulnerability/wordpress-simple-membership-plugin-4-7-2-cross-site-scripting-xss-vulnerability?_s_id=cve

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