CVE-2026-31848 Reversible ecos_pw Cookie Allows Authentication Bypass in Nexxt Nebula 300+
Attackers can bypass authentication on Nexxt Nebula 300+ cameras by forging reversible Base64 cookies, gaining unauthorized access.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-31848?
CVE-2026-31848 is a high-severity authentication bypass vulnerability in Nexxt Solutions Nebula 300+, published on 23 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-312
Which versions are affected by CVE-2026-31848?
It affects 1 product.
Products include Nexxtsolutions Nebula300plus Firmware.
How do I fix CVE-2026-31848?
No fix has been published for CVE-2026-31848 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-31848 being exploited?
There is no known exploitation of CVE-2026-31848 in the wild and no public exploit code.
Other vulnerabilities in Nexxt Solutions Nebula 300+
- CVE-2026-31847 Hidden Functionality Enables Remote Telnet Activation via /goform/setSysTools in Nexxt Nebula 300+
- CVE-2026-31851 Nexxt Nebula 300+ - Lack of Rate Limiting Enables Brute-Force Attacks
- CVE-2026-31849 Missing CSRF Protection on Administrative Endpoints in Nexxt Nebula 300+
- CVE-2026-31850 Plaintext Storage of Credentials in Configuration Backup in Nexxt Nebula 300+
Sources
Also known as GHSA-7xw4-69gx-5gch.