CVE-2026-31848

8.7 highEPSS 0.3%

High (8.7) in nexxtsolutions nebula300plus firmware. EPSS 0.3% chance of exploitation in the next 30 days.

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.

Severity

CVSS 4.0

8.7 high

CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS 3.1

9.8 critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.3% chance of exploitation in the next 30 days; higher than 22% of CVEs (scores of 2026-10-31)
CWE: CWE-312
Published: 2026-03-23
Modified: 2026-08-10
Record from: the NVD, synced 2026-10-19

Affected

nexxtsolutions:nebula300plus_firmware

References

https://nexxt-connectivity-frontend.s3.amazonaws.com/media/docs/Nebula300+_v12.01.01.37.zip
https://www.nexxtsolutions.com/connectivity/internal-products/ARN02304U6/

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