How severe is CVE-2026-39578?

CVE-2026-39578 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-39578 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-39578?

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

Does CVE-2026-39578 have an EU (EUVD) identifier?

Yes. CVE-2026-39578 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-37483.

When was CVE-2026-39578 published?

CVE-2026-39578 was published on 2026-06-17.

CVE-2026-39578

CVE-2026-39578 is a medium-severity vulnerability with a CVSS 3.x base score of 5.5. 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-502.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
EPSS exploit prediction: 0% (19th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-37483
Weakness: CWE-502
Published: 2026-06-17
Last modified: 2026-06-17

Description

Unauthenticated PHP Object Injection in Valiance <= 1.2 versions.

Frequently asked questions

What is CVE-2026-39578?: Unauthenticated PHP Object Injection in Valiance <= 1.2 versions.
How severe is CVE-2026-39578?: CVE-2026-39578 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-39578 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-39578?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-39578 have an EU (EUVD) identifier?: Yes. CVE-2026-39578 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-37483.
When was CVE-2026-39578 published?: CVE-2026-39578 was published on 2026-06-17.

References

https://patchstack.com/database/wordpress/theme/valiance/vulnerability/wordpress-valiance-theme-1-2-php-object-injection-vulnerability?_s_id=cve

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