Security readout for executives and security teams
Plain-English summary
Affected Nexxt Nebula 300+ devices can reveal their administrator password to an unauthenticated attacker with adjacent network access. That credential could then permit administrative device access. This creates a serious risk to network configuration and traffic trust, although the supplied sources do not report active exploitation.
Executive priority
Prioritize identification and containment because administrative credentials may be disclosed without authentication. Address devices on shared, guest-accessible, or otherwise untrusted local networks first. Obtain vendor guidance promptly; the supplied sources do not identify a fixed release, and active exploitation has not been established.
Technical view
Firmware through 12.01.01.37 lacks authentication on the /goform/ate endpoint. An adjacent attacker can retrieve sensitive device information containing an encoded administrator password, decode it, and authenticate legitimately. The issue is classified as CWE-306 and scored 7.1 under CVSS 4.0; the supplied vector indicates high confidentiality impact without stated integrity or availability impact.
Likely exposure
Exposure applies to Nexxt Solutions Nebula 300+ devices, identified in the bundle with Tenda F3 V2.0 firmware, running version 12.01.01.37 or earlier. The CVSS vector requires adjacent access, such as relevant local network proximity; internet reachability is not established by the supplied evidence.
Exploitation context
No CISA KEV listing or cited evidence of active exploitation is supplied. Exploitation requires no authentication, privileges, or user interaction, but does require adjacent network access. Successful disclosure can yield valid administrative credentials. Public proof-of-concept availability is not established by the provided sources.
Researcher notes
The record describes missing authentication at /goform/ate and subsequent decoding of a disclosed administrator password. The evidence supports credential disclosure and authenticated follow-on access, but does not establish remote internet exploitation, public exploit availability, exploitation in the wild, or a fixed firmware version. Validation should avoid retrieving or decoding production credentials unnecessarily.
Mitigation direction
- Inventory Nebula 300+ devices and identify firmware versions at or below 12.01.01.37.
- Check Nexxt Solutions guidance for corrected firmware or vendor-approved mitigation; none is identified in the supplied sources.
- Restrict untrusted devices from reaching affected routers as a temporary compensating control.
- After applying vendor-approved remediation, rotate administrator credentials and review device configuration for unauthorized changes.
Validation and detection
- Confirm device model and installed firmware through trusted administrative or asset-management records.
- Verify whether network segmentation prevents untrusted adjacent systems from reaching affected devices.
- Review administrative access logs and configuration history for unexpected logins or changes, where available.
- After remediation, confirm the installed firmware matches Nexxt Solutions guidance and previous credentials no longer work.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-306: Credential and account abuse lookup
Authentication and credential weaknesses can make valid-account abuse and credential telemetry useful review starting points. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCredential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-31846 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.1 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
3 official scoresWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N——TuranSecCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N2.83.6TuranSecAV:A/AC:L/Au:N/C:C/I:N/A:N6.56.9TuranSecVulnerability scoring details
Base CVSS 4.0 score
7.1HighVector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Base CVSS 3.1 score
6.5MediumVector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Base CVSS 2.0 score
6.1MediumVector: AV:A/AC:L/Au:N/C:C/I:N/A:N
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://www.nexxtsolutions.com/connectivity/internal-products/ARN02304U6/CVE reference, TuranSec · product
- https://nexxt-connectivity-frontend.s3.amazonaws.com/media/docs/Nebula300+_v12.01.01.37.zipCVE reference, TuranSec · product
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Missing Authentication for Critical Function
Missing Authentication for Critical Function represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.