How severe is CVE-2026-39521?

CVE-2026-39521 has a CVSS 3.x base score of 4.9, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-39521 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-39521?

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

Does CVE-2026-39521 have an EU (EUVD) identifier?

Yes. CVE-2026-39521 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-20183.

When was CVE-2026-39521 published?

CVE-2026-39521 was published on 2026-04-08 and last updated on 2026-06-17.

CVE-2026-39521

CVE-2026-39521 is a medium-severity vulnerability with a CVSS 3.x base score of 4.9. 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-918.

Key facts

Severity: Medium (CVSS 3.x base score 4.9)
EPSS exploit prediction: 0% (4th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-20183
Weakness: CWE-918
Published: 2026-04-08
Last modified: 2026-06-17

Description

Server-Side Request Forgery (SSRF) vulnerability in Nelio Software Nelio Content nelio-content allows Server Side Request Forgery.This issue affects Nelio Content: from n/a through <= 4.3.1.

Frequently asked questions

What is CVE-2026-39521?: Server-Side Request Forgery (SSRF) vulnerability in Nelio Software Nelio Content nelio-content allows Server Side Request Forgery.This issue affects Nelio Content: from n/a through <= 4.3.1.
How severe is CVE-2026-39521?: CVE-2026-39521 has a CVSS 3.x base score of 4.9, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-39521 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-39521?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-39521 have an EU (EUVD) identifier?: Yes. CVE-2026-39521 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-20183.
When was CVE-2026-39521 published?: CVE-2026-39521 was published on 2026-04-08 and last updated on 2026-06-17.

References

https://patchstack.com/database/Wordpress/Plugin/nelio-content/vulnerability/wordpress-nelio-content-plugin-4-3-1-server-side-request-forgery-ssrf-vulnerability?_s_id=cve

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