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CVE Record

CVE-2026-19900: LB-LINK X-PRO shadow hard-coded credentials

A vulnerability was identified in LB-LINK X-PRO 1.0.22-20231206. The impacted element is an unknown function of the file /etc/shadow. The manipulation leads to hard-coded credentials. It is possible to initiate the attack remotely. A high degree of complexity is needed for the attack. The exploitability is regarded as difficult. The exploit is publicly available and might be used. The vendor was contacted early about this disclosure but did not respond in any way.

CriticalCVSS 9.2Not KEV-listedUpdated
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Glexia's TakeAutomated analysiscritical

Security readout for executives and security teams

Plain-English summary

LB-LINK X-PRO firmware version 1.0.22-20231206 reportedly contains hard-coded credentials associated with its password database. A remote attacker could potentially use them to gain extensive control, although the reported attack complexity is high. Public exploit information exists, but the supplied sources do not establish active exploitation or identify a vendor fix.

Executive priority

Treat confirmed affected, remotely reachable devices as an urgent remediation priority. Immediately reduce network exposure and establish ownership for vendor follow-up or replacement. Prioritize devices protecting sensitive or operationally important networks, while recognizing that public proof-of-concept availability does not itself demonstrate attacks in the wild.

Technical view

CVE-2026-19900 concerns hard-coded credentials in the X-PRO firmware's /etc/shadow file, classified as CWE-259 and CWE-798. It carries CVSS 4.0 score 9.2 because successful network exploitation could severely affect confidentiality, integrity, and availability. The source reports no privileges or user interaction required, but high attack complexity.

Likely exposure

Confirmed scope is limited to LB-LINK X-PRO 1.0.22-20231206. Devices are more exposed when remotely reachable or accessible from untrusted networks. The supplied CPE is version-wildcarded, but the evidence names only this firmware release; broader version impact should not be assumed.

Exploitation context

Technical details described as an exploit are publicly available, and CVSS marks exploit maturity as proof-of-concept. However, the CVE is not identified as CISA KEV in the supplied bundle, and no cited evidence confirms active exploitation. Reported remote exploitation is considered difficult because attack complexity is high.

Researcher notes

The disclosure attributes the issue to /etc/shadow but does not clearly explain the vulnerable function or complete prerequisite chain. VulDB reports vendor non-response and difficult remote exploitation. Validate exact hardware and firmware identity before testing. Do not infer that every version matching the wildcard CPE is affected without additional evidence.

Mitigation direction

  • Inventory LB-LINK X-PRO devices and identify firmware version 1.0.22-20231206.
  • Remove affected management interfaces from direct internet or untrusted-network exposure.
  • Restrict device administration to authorized management networks and trusted operators.
  • Check LB-LINK guidance for corrected firmware or supported remediation; none is identified in the supplied sources.
  • Plan device replacement if affected systems cannot be securely isolated or vendor remediation remains unavailable.

Validation and detection

  • Verify product model and installed firmware through approved administrative or asset-management records.
  • Confirm whether management services are reachable from the internet or untrusted network segments.
  • Review authentication and administrative logs for unexplained access or configuration changes.
  • Verify segmentation and access controls prevent unauthorized connections to device administration services.
  • Recheck vendor and CVE guidance for newly published firmware, mitigations, or expanded affected-version information.
Prepared
Confidence
medium
Sources
6

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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 · low confidence lookup

CWE-259: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. 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 lookup
cwe · medium confidence lookup

CWE-798: 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 lookup
cve · low confidence lookup

CVE-2026-19900 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
Critical
CVSS
9.2 (4.0)
Known Exploited
No
Published

Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P

Official CVE source material

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.

4CVSS vectors
6Timeline events
1ADP providers
6Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: pocAutomatable: noTechnical Impact: total

CVSS vector scores

4 official scores

We 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.

ScoreVersionSeverityVectorExploitImpactSource
9.2CVSS 4.0CriticalCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P——VulDB
8.1CVSS 3.1HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R2.25.9VulDB
8.1CVSS 3.0HighCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R2.25.9VulDB
7.6CVSS 2.0HighAV:N/AC:H/Au:N/C:C/I:C/A:C/E:POC/RL:ND/RC:UR4.910VulDB

Vulnerability scoring details

Base CVSS 4.0 score

9.2Critical
CVSS 4.0 vector shape for CVE-2026-19900Attack VectorAttack ComplexityAttack RequirementsPrivileges RequiredUser InteractionVS ConfidentialityVS IntegrityVS AvailabilitySS ConfidentialitySS IntegritySS Availability

Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Attack Requirements
NonePresent
Privileges Required
NoneLowHigh
User Interaction
NonePassiveActive
VS Confidentiality
HighLowNone
VS Integrity
HighLowNone
VS Availability
HighLowNone
SS Confidentiality
HighLowNone
SS Integrity
HighLowNone
SS Availability
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. Source timelineVulDB

    Advisory disclosed

  2. Source timelineVulDB

    VulDB entry created

  3. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  4. Source timelineVulDB

    VulDB entry last update

  5. CVE publishedCVE Program

    The CVE record was published.

  6. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LB-LINKX-PRO1.0.22-20231206Listed
Weakness

CWE details

CWE-259CWE-798

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.