PatchTheCVECVE-2026-31848: Nexxt Solutions Nebula 300+ firmware through version 12.01.01.37 uses the ecos_pw cookie for authentication, w
CVE-2026-31848 is a critical-severity flaw (CVSS 9.8) affecting nebula300plus firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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.
Why this priority
- Critical severity
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 9.8 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.3% (top 78%) |
| CISA exploited list | No |
| Weakness | CWE-312 |
| Published | 2026-03-23 |
| Last modified | 2026-08-10 |
Last updated 2026-08-10 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-31848?
nebula300plus firmware: upgrade to newer than 12.01.01.37. Exact commands for each OS are on this page.
Is CVE-2026-31848 being exploited?
CVE-2026-31848 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-31848 affect?
CVE-2026-31848 affects nebula300plus firmware. Severity is critical (CVSS 9.8). 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
How urgent is CVE-2026-31848?
Priority 45/100. Critical severity; Remotely exploitable, no login, no user action
Related CVEs
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