How severe is CVE-2026-5027?

CVE-2026-5027 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-5027 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-5027?

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-2026-5027 have an EU (EUVD) identifier?

Yes. CVE-2026-5027 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-16668.

When was CVE-2026-5027 published?

CVE-2026-5027 was published on 2026-03-27 and last updated on 2026-06-17.

CVE-2026-5027

CVE-2026-5027 is a high-severity vulnerability with a CVSS 3.x base score of 8.8. 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-22.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 2% (80th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-16668
Weakness: CWE-22
Published: 2026-03-27
Last modified: 2026-06-17

Description

The 'POST /api/v2/files' endpoint does not sanitize the 'filename' parameter from the multipart form data, allowing an attacker to write files to arbitrary locations on the filesystem using path traversal sequences ('../').

Frequently asked questions

What is CVE-2026-5027?: The 'POST /api/v2/files' endpoint does not sanitize the 'filename' parameter from the multipart form data, allowing an attacker to write files to arbitrary locations on the filesystem using path traversal sequences ('../').
How severe is CVE-2026-5027?: CVE-2026-5027 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-5027 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-5027?: 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-2026-5027 have an EU (EUVD) identifier?: Yes. CVE-2026-5027 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-16668.
When was CVE-2026-5027 published?: CVE-2026-5027 was published on 2026-03-27 and last updated on 2026-06-17.

References

https://www.tenable.com/security/research/tra-2026-26

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