How severe is CVE-2026-31848?

CVE-2026-31848 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-31848 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-31848?

CVE-2026-31848 affects Nexxtsolutions Nebula300plus Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-31848?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-31848 have an EU (EUVD) identifier?

Yes. CVE-2026-31848 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-14415.

When was CVE-2026-31848 published?

CVE-2026-31848 was published on 2026-03-23 and last updated on 2026-06-17.

CVE-2026-31848

CVE-2026-31848 is a critical-severity vulnerability in Nexxtsolutions Nebula300plus Firmware with a CVSS 3.x base score of 9.8. 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-312.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v4: 8.7
EPSS exploit prediction: 0% (20th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-14415
Weakness: CWE-312
Affected product: Nexxtsolutions Nebula300plus Firmware
Published: 2026-03-23
Last modified: 2026-06-17

Description

Nexxt Solutions Nebula 300+ firmware through version 12.01.01.37 uses the ecos_pw cookie for authentication, which contains Base64-encoded credential data combined with a static suffix. Because the encoding is reversible and lacks integrity protection, an attacker can reconstruct or forge a valid cookie value without proper authentication. This allows unauthorized administrative access to protected endpoints.

Frequently asked questions

What is CVE-2026-31848?: Nexxt Solutions Nebula 300+ firmware through version 12.01.01.37 uses the ecos_pw cookie for authentication, which contains Base64-encoded credential data combined with a static suffix. Because the encoding is reversible and lacks integrity protection, an attacker can reconstruct or forge a valid cookie value without proper authentication. This allows unauthorized administrative access to protected endpoints.
How severe is CVE-2026-31848?: CVE-2026-31848 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-31848 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-31848?: CVE-2026-31848 affects Nexxtsolutions Nebula300plus Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-31848?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-31848 have an EU (EUVD) identifier?: Yes. CVE-2026-31848 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-14415.
When was CVE-2026-31848 published?: CVE-2026-31848 was published on 2026-03-23 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:nexxtsolutions:nebula300plus_firmware:*:*:*:*:*:*:*:*

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