How severe is CVE-2026-40733?

CVE-2026-40733 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-40733 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-40733?

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-2026-40733 have an EU (EUVD) identifier?

Yes. CVE-2026-40733 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-37693.

When was CVE-2026-40733 published?

CVE-2026-40733 was published on 2026-06-17.

CVE-2026-40733

CVE-2026-40733 is a high-severity vulnerability with a CVSS 3.x base score of 8.1. 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-502.

Key facts

Severity: High (CVSS 3.x base score 8.1)
EPSS exploit prediction: 0% (23rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-37693
Weakness: CWE-502
Published: 2026-06-17
Last modified: 2026-06-17

Description

Unauthenticated PHP Object Injection in ShiftUp <= 1.3 versions.

Frequently asked questions

What is CVE-2026-40733?: Unauthenticated PHP Object Injection in ShiftUp <= 1.3 versions.
How severe is CVE-2026-40733?: CVE-2026-40733 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-40733 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-40733?: 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-2026-40733 have an EU (EUVD) identifier?: Yes. CVE-2026-40733 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-37693.
When was CVE-2026-40733 published?: CVE-2026-40733 was published on 2026-06-17.

References

https://patchstack.com/database/wordpress/theme/shiftup/vulnerability/wordpress-shiftup-theme-1-3-php-object-injection-vulnerability?_s_id=cve

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