How severe is CVE-2025-55383?

CVE-2025-55383 has a CVSS 3.x base score of 8.6, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability low.

Is CVE-2025-55383 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-55383?

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-2025-55383 have an EU (EUVD) identifier?

Yes. CVE-2025-55383 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-25433.

When was CVE-2025-55383 published?

CVE-2025-55383 was published on 2025-08-21 and last updated on 2026-06-17.

CVE-2025-55383

CVE-2025-55383 is a high-severity vulnerability with a CVSS 3.x base score of 8.6. 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-434.

Key facts

Severity: High (CVSS 3.x base score 8.6)
EPSS exploit prediction: 0% (18th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-25433
Weakness: CWE-434
Published: 2025-08-21
Last modified: 2026-06-17

Description

Moss before v0.15 has a file upload vulnerability. The "upload" function configuration allows attackers to upload files of any extension to any location on the target server.

Frequently asked questions

What is CVE-2025-55383?: Moss before v0.15 has a file upload vulnerability. The "upload" function configuration allows attackers to upload files of any extension to any location on the target server.
How severe is CVE-2025-55383?: CVE-2025-55383 has a CVSS 3.x base score of 8.6, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability low.
Is CVE-2025-55383 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-55383?: 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-2025-55383 have an EU (EUVD) identifier?: Yes. CVE-2025-55383 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-25433.
When was CVE-2025-55383 published?: CVE-2025-55383 was published on 2025-08-21 and last updated on 2026-06-17.

References

https://github.com/deep-project/moss/issues/16

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