CVE-2026-1840Disclosure

MEDIUMCVSS 8.7 · HIGH

Exploitation ongoing with high activity in latest observed window (1 mentions)

Immediate actions

Prioritize remediation for affected systems immediately
Assume compromise if assets are exposed
Hunt for exploitation attempts and persistence artifacts
Increase monitoring for publicly documented tradecraft
Track advisory updates for patch or workaround availability

Recommended action window: Immediate (within 24h)

NVD 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.

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5.0/ 10 priority

Sources & remediation

Other references

Weakness type (CWE)

CWE-306

Priority

MEDIUM

Exploitation

ACTIVE

PoC

YES

Patch

NONE

Momentum

STABLE

Threat summary

Active exploitation appears in 1 classified signals
Public PoC is present in monitored signal
6 mentions across 5 observed days
Momentum state: stable

What's happening

Active exploitation reported across 1 signal
PoC mentioned or linked in 1 signal
Technical details provided in 3 signals
Disclosure: 3 classified signals
General: 2 classified signals
Peaked 4d ago at 2 mentions (2026-06-23); latest day: 1
6 total mentions across 5 days

Deep dive

Activity timeline6 mentions / 5d

Signal classification3 categories

Disclosure

350.0%

General

233.3%

Active Exploitation

116.7%

Referenced assets6 URLs

By indicator

Classification over time

Date	Total	Labels

2026-06-23	2	Active Exploitation1Disclosure1
2026-06-24	1	General1
2026-06-25	1	Disclosure1
2026-06-29	1	General1
2026-09-11	1	Disclosure1

Full discourse6 posts

Hugo | DevOps | Cybersecurity 🇱🇻@HugoValters90d
Disclosure
#CVE-2026-1840 - Critical unauthorized access in Aclara Metrum Cellular Web Interface. No authentication on system functions. #CVSS 7.5. Unpatched. Urgent action needed. #infosec #cybersecurity #cvealert #developers #linux #hosting More detiled info: https://www.valtersit.com/cve/CVE-2026-1840
Post summary
The tweet announces CVE‑2026‑1840, highlighting critical unauthorized access due to missing authentication and a CVSS score of 7.5, notes the vulnerability is unpatched, and urges urgent action while linking to a detailed info page.
1002086
1.0K followersView on X
Israel@f1tym191d
Disclosure
CVE-2026-1840 in Hubbell Aclara Metrum Cellular Web Interface allows unauthenticated attackers to manipulate critical device settings and disrupt operations. https://ift.tt/tdP7r5N
Post summary
The post announces CVE-2026-1840 for Hubbell Aclara Metrum Cellular Web Interface, noting that unauthenticated attackers can manipulate critical device settings and disrupt operations, but provides no further technical details or mitigation information.
1001085
1.0K followersView on X
Aviatrix Threat Research Center@aviatrixtrc91d
Active Exploitation
TRC analysis shows attackers exploiting missing authentication in Hubbell Aclara Metrum devices (CVE-2026-1840) to modify critical settings and establish persistent control. The vulnerability affects energy sector infrastructure across multiple networks. Runtime segmentation could help limit blast radius when industrial devices are compromised. #CloudSecurity #CriticalInfrastructure 🔗 Full TRC analysis: https://aviatrix.ai/threat-research-center/hubbell-aclara-metrum-cellular-web-interface-cve-2026-1840
Post summary
Attackers are actively exploiting a missing‑authentication flaw in Hubbell Aclara Metrum devices (CVE‑2026‑1840) to modify critical settings and maintain persistence across energy‑sector networks, with no patch or PoC mentioned. Runtime segmentation is suggested as a mitigating measure.
1001074
1.9K followersView on X
ℍ𝕠𝕝𝕒𝕣𝕛𝕙𝕪𝕕𝕖𝕙🎫📸@olajide_james_12d
Disclosure
🔐How I found an authentication bypass in Aclara Metrum — CVE-2026-1840. In my latest video, I break down the research process, the authentication flaw, and how the bypass works. 🎥 Watch the walkthrough: https://youtu.be/2s1BqicMnfA #CyberSecurity #CVE #InfoSec #BugBounty https://t.co/CpJLCWa5nF
Post summary
The user announces the discovery of an authentication bypass flaw in Aclara Metrum (CVE‑2026‑1840) and shares a YouTube walkthrough that demonstrates how the vulnerability is exploited.
00000103
179 followersView on X
UNDERCODE TESTING@UndercodeUpdate86d
General
🚨 #CVE-2026-1840: The 93 CVSS Critical Infrastructure Nightmare—Unauthenticated OT Device Reboots Expose Energy Sector + Video https://undercodetesting.com/cve-2026-1840-the-93-cvss-critical-infrastructure-nightmare-unauthenticated-ot-device-reboots-expose-energy-sector-video/ Educational Purposes!
Post summary
The post announces a newly disclosed CVE with an educational video, but provides no PoC, exploit details, patch information, or evidence of active exploitation.
0000077
643 followersView on X
UNDERCODE TESTING@UndercodeUpdate91d
General
🚨 #CVE-2026-1840: Unauthenticated OT Device Restarts Expose Critical Energy Infrastructure – How to Hunt and Harden + Video https://undercodetesting.com/cve-2026-1840-unauthenticated-ot-device-restarts-expose-critical-energy-infrastructure-how-to-hunt-and-harden-video/ Educational Purposes!
Post summary
The post cites CVE‑2026‑1840 and discusses unauthenticated OT device restarts that could impact critical energy infrastructure, but it offers no PoC, exploit code, patch, or evidence of active exploitation.
0000067
635 followersView on X

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What researchers are saying

CVE-2026-1840

Hugo | DevOps | Cybersecurity 🇱🇻[verified]@HugoValtersDisclosure

The tweet announces CVE‑2026‑1840, highlighting critical unauthorized access due to missing authentication and a CVSS score of 7.5, notes the vulnerability is unpatched, and urges urgent action while linking to a detailed info page.

Israel[verified]@f1tym1Disclosure

The post announces CVE-2026-1840 for Hubbell Aclara Metrum Cellular Web Interface, noting that unauthenticated attackers can manipulate critical device settings and disrupt operations, but provides no further technical details or mitigation information.

Aviatrix Threat Research Center[verified]@aviatrixtrcActive Exploitation

Attackers are actively exploiting a missing‑authentication flaw in Hubbell Aclara Metrum devices (CVE‑2026‑1840) to modify critical settings and maintain persistence across energy‑sector networks, with no patch or PoC mentioned. Runtime segmentation is suggested as a mitigating measure.

UNDERCODE TESTING[verified]@UndercodeUpdateGeneral

The post announces a newly disclosed CVE with an educational video, but provides no PoC, exploit details, patch information, or evidence of active exploitation.

UNDERCODE TESTING[verified]@UndercodeUpdateGeneral

The post cites CVE‑2026‑1840 and discusses unauthenticated OT device restarts that could impact critical energy infrastructure, but it offers no PoC, exploit code, patch, or evidence of active exploitation.

ℍ𝕠𝕝𝕒𝕣𝕛𝕙𝕪𝕕𝕖𝕙🎫📸@olajide_james_Disclosure

The user announces the discovery of an authentication bypass flaw in Aclara Metrum (CVE‑2026‑1840) and shares a YouTube walkthrough that demonstrates how the vulnerability is exploited.