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Vulnerability record · CVE-2026-69658 · published 28 August 2026

CVE-2026-69658: Cleartext transmission vulnerability

MQTT credentials and control traffic are transmitted in cleartext, exposing sensitive information to network-level attackers. This may enable unauthorized device impersonation and disruption of messaging functions.

9.3 CVSS 4.0 Critical EPSS 0.34% · top 74.7% CWE-319 · Cleartext transmission Deferred
9.3CVSS 4.0 base score
0.34%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
31 Aug 2026Last modified by NVD

Description

MQTT credentials and control traffic are transmitted in cleartext, exposing sensitive information to network-level attackers. This may enable unauthorized device impersonation and disruption of messaging functions.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-237-06.json
https://www.cisa.gov/news-events/ics-advisories/icsa-26-237-06

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Source: NIST National Vulnerability Database (record CVE-2026-69658), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.