How severe is CVE-2026-53944?

CVE-2026-53944 has a CVSS 3.x base score of 5.8, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2026-53944 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-2026-53944?

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

Does CVE-2026-53944 have an EU (EUVD) identifier?

Yes. CVE-2026-53944 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39025.

When was CVE-2026-53944 published?

CVE-2026-53944 was published on 2026-06-24 and last updated on 2026-06-25.

CVE-2026-53944

CVE-2026-53944 is a medium-severity vulnerability with a CVSS 3.x base score of 5.8. 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-184.

Key facts

Severity: Medium (CVSS 3.x base score 5.8)
EPSS exploit prediction: 0% (10th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-39025
Weakness: CWE-184
Published: 2026-06-24
Last modified: 2026-06-25

Description

Ghost is a Node.js content management system. From 6.0.9 until 6.21.1, when making an external request, it is possible to bypass the IP filter that ensures the request isn't going to an internal service using an IPv6 literal which maps to a private IPv4 address. This vulnerability is fixed in 6.21.1.

Frequently asked questions

What is CVE-2026-53944?: Ghost is a Node.js content management system. From 6.0.9 until 6.21.1, when making an external request, it is possible to bypass the IP filter that ensures the request isn't going to an internal service using an IPv6 literal which maps to a private IPv4 address. This vulnerability is fixed in 6.21.1.
How severe is CVE-2026-53944?: CVE-2026-53944 has a CVSS 3.x base score of 5.8, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2026-53944 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-2026-53944?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-53944 have an EU (EUVD) identifier?: Yes. CVE-2026-53944 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39025.
When was CVE-2026-53944 published?: CVE-2026-53944 was published on 2026-06-24 and last updated on 2026-06-25.

References

https://github.com/TryGhost/Ghost/security/advisories/GHSA-wvp2-4qqp-4h3r

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