CVE-2026-31848
Critical
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.
SeverityCritical
CVSS9.8
Exploit probability—
ProductNexxtsolutions Nebula300plus Firmware
PublishedMar 23, 2026
First seenMar 23, 2026
Weakness typeCWE-312CWE-312
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| nexxtsolutions nebula300plus_firmware | v ≤ 12.01.01.37 | — |
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