How severe is CVE-2026-56771?

CVE-2026-56771 has a CVSS 3.x base score of 8.5, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity high, and availability none.

Is CVE-2026-56771 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-56771?

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-2026-56771 have an EU (EUVD) identifier?

Yes. CVE-2026-56771 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39524.

When was CVE-2026-56771 published?

CVE-2026-56771 was published on 2026-06-25 and last updated on 2026-06-26.

CVE-2026-56771

CVE-2026-56771 is a high-severity vulnerability with a CVSS 3.x base score of 8.5. 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-918.

Key facts

Severity: High (CVSS 3.x base score 8.5)
CVSS v4: 6.3
EPSS exploit prediction: 0% (10th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-39524
Weakness: CWE-918
Published: 2026-06-25
Last modified: 2026-06-26

Description

NewsBlur before version 14.5.0 contains a server-side request forgery vulnerability in the add_url endpoint that allows authenticated users to make arbitrary server requests to internal networks by failing to filter private IP addresses. Attackers can exploit this to access localhost services and cloud metadata endpoints, enabling internal network scanning and sensitive data exfiltration.

Frequently asked questions

What is CVE-2026-56771?: NewsBlur before version 14.5.0 contains a server-side request forgery vulnerability in the add_url endpoint that allows authenticated users to make arbitrary server requests to internal networks by failing to filter private IP addresses. Attackers can exploit this to access localhost services and cloud metadata endpoints, enabling internal network scanning and sensitive data exfiltration.
How severe is CVE-2026-56771?: CVE-2026-56771 has a CVSS 3.x base score of 8.5, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity high, and availability none.
Is CVE-2026-56771 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-56771?: 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-2026-56771 have an EU (EUVD) identifier?: Yes. CVE-2026-56771 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39524.
When was CVE-2026-56771 published?: CVE-2026-56771 was published on 2026-06-25 and last updated on 2026-06-26.

References

Other CWE-918 (Server-Side Request Forgery (SSRF)) vulnerabilities

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