How severe is CVE-2026-40770?

CVE-2026-40770 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2026-40770 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-40770?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-40770 have an EU (EUVD) identifier?

Yes. CVE-2026-40770 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36979.

When was CVE-2026-40770 published?

CVE-2026-40770 was published on 2026-06-15 and last updated on 2026-06-17.

CVE-2026-40770

CVE-2026-40770 is a high-severity vulnerability with a CVSS 3.x base score of 7.1. 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: High (CVSS 3.x base score 7.1)
EPSS exploit prediction: 0% (7th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-36979
Weakness: CWE-79
Published: 2026-06-15
Last modified: 2026-06-17

Description

Unauthenticated Cross Site Scripting (XSS) in Coupon Affiliates <= 7.5.3 versions.

Frequently asked questions

What is CVE-2026-40770?: Unauthenticated Cross Site Scripting (XSS) in Coupon Affiliates <= 7.5.3 versions.
How severe is CVE-2026-40770?: CVE-2026-40770 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2026-40770 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-40770?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-40770 have an EU (EUVD) identifier?: Yes. CVE-2026-40770 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36979.
When was CVE-2026-40770 published?: CVE-2026-40770 was published on 2026-06-15 and last updated on 2026-06-17.

References

https://patchstack.com/database/wordpress/plugin/woo-coupon-usage/vulnerability/wordpress-coupon-affiliates-plugin-7-5-3-cross-site-scripting-xss-vulnerability?_s_id=cve

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