Administrative authentication bypass via forgeable ecos_pw cookie
Published Mar 23, 2026 · Updated Mar 23, 2026
Authentication bypass in Nexxt Solutions Nebula 300+ firmware through 12.01.01.37 allows remote attackers to gain administrative access. The ecos_pw cookie Base64-encodes credential data with a static suffix and supplies no integrity protection, permitting reconstruction or forgery. Network reachability to the router web interface is sufficient, and the forged cookie grants access to protected administrative endpoints without prior authentication.
Summary
What happened
Authentication bypass in Nexxt Solutions Nebula 300+ firmware through 12.01.01.37 allows remote attackers to gain administrative access. The ecos_pw cookie Base64-encodes credential data with a static suffix and supplies no integrity protection, permitting reconstruction or forgery. Network reachability to the router web interface is sufficient, and the forged cookie grants access to protected administrative endpoints without prior authentication.
The record
- CVE
- CVE-2026-31848
- Published
- Mar 23, 2026
- Updated
- Mar 23, 2026
- Vendor
- Nexxt Solutions
- Product
- Nebula 300+
- Classifications
- CWE-312, T1606.001
- Attack vector
- adjacent
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 23, 2026CVE publishedPublication date reported by the CVE source.
- Mar 23, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=<= 12.01.01.37
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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