How severe is CVE-2026-39880?

CVE-2026-39880 has a CVSS 3.x base score of 5.0, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2026-39880 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-39880?

CVE-2026-39880 affects Remnawave Remnawave Backend. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-39880?

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

Does CVE-2026-39880 have an EU (EUVD) identifier?

Yes. CVE-2026-39880 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-20620.

When was CVE-2026-39880 published?

CVE-2026-39880 was published on 2026-04-08 and last updated on 2026-06-17.

CVE-2026-39880

CVE-2026-39880 is a medium-severity vulnerability in Remnawave Remnawave Backend with a CVSS 3.x base score of 5.0. 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-362.

Key facts

Severity: Medium (CVSS 3.x base score 5.0)
EPSS exploit prediction: 0% (8th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-20620
Weakness: CWE-362
Affected product: Remnawave Remnawave Backend
Published: 2026-04-08
Last modified: 2026-06-17

Description

Remnawave Backend is the backend for the Remnawave proxy and user management solution. Prior to 2.7.5, a glitch in the HWID device registration logic allows an authenticated user to bypass the configured limit for HWID devices and register more devices than expected, allowing them to resell subscriptions and consume excessive traffic. This vulnerability is fixed in 2.7.5.

Frequently asked questions

What is CVE-2026-39880?: Remnawave Backend is the backend for the Remnawave proxy and user management solution. Prior to 2.7.5, a glitch in the HWID device registration logic allows an authenticated user to bypass the configured limit for HWID devices and register more devices than expected, allowing them to resell subscriptions and consume excessive traffic. This vulnerability is fixed in 2.7.5.
How severe is CVE-2026-39880?: CVE-2026-39880 has a CVSS 3.x base score of 5.0, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2026-39880 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-39880?: CVE-2026-39880 affects Remnawave Remnawave Backend. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-39880?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-39880 have an EU (EUVD) identifier?: Yes. CVE-2026-39880 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-20620.
When was CVE-2026-39880 published?: CVE-2026-39880 was published on 2026-04-08 and last updated on 2026-06-17.

References

https://github.com/remnawave/backend/security/advisories/GHSA-985p-44h5-v3pq

Affected products (1)

cpe:2.3:a:remnawave:remnawave_backend:*:*:*:*:*:*:*:*

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