Security readout for executives and security teams
Plain-English summary
CVE-2026-22535 affects EFACEC QC 60/90/120 version 8. The issue involves unencrypted MQTT communications that can let a credentialed network attacker write to server topics controlling MQTT communications. For industrial or charging infrastructure environments, this could affect confidentiality, integrity, and availability of critical parameters.
Executive priority
Treat as high priority for affected operational environments. The vulnerability could allow credentialed manipulation of critical MQTT-controlled parameters. Focus first on identifying version 8 assets, reducing network reachability, and obtaining vendor guidance before assuming a patch or permanent fix exists.
Technical view
The CVE describes weak security in MQTT communications: an attacker with network interaction ability and valid credentials may write to server topics on the board controlling MQTT communications. CVSS v4.0 is 8.9 high, with adjacent attack vector, high attack complexity, low privileges, no user interaction, and high impacts across vulnerable and subsequent systems.
Likely exposure
Exposure is likely limited to EFACEC QC 60/90/120 version 8 deployments where MQTT communications are reachable by an attacker with credentials. The CVSS vector indicates adjacent-network access, not broad internet reach. Default status for other versions is listed as unaffected in the source bundle.
Exploitation context
No CISA KEV listing or cited source indicates active exploitation. The described attack requires valid credentials and network ability to interact with the affected MQTT path. Because the protocol is described as unencrypted, credential misuse or network positioning could materially increase risk.
Researcher notes
Public detail is limited. The CVE names EFACEC QC 60/90/120 version 8 and describes unencrypted MQTT enabling credentialed topic writes. No exploit code, patch, or active exploitation evidence is provided in the supplied sources. Validate assumptions directly against vendor documentation and asset configuration.
Mitigation direction
- Check EFACEC or Thales advisory channels for official remediation guidance.
- Restrict MQTT network access to trusted management or operational segments.
- Review and rotate credentials associated with affected MQTT communications.
- Monitor MQTT topic writes for unauthorized or unexpected changes.
- Prioritize compensating controls where patch guidance is not yet available.
Validation and detection
- Inventory EFACEC QC 60/90/120 assets and identify version 8 deployments.
- Confirm whether MQTT communications are enabled and reachable from adjacent networks.
- Verify whether MQTT traffic is encrypted or otherwise protected in the environment.
- Review access control lists for systems able to reach MQTT services.
- Inspect logs for unexpected writes to MQTT server topics.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
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
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Open ATT&CK lookupCVE-2026-22535 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 8.9 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:A/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
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.
CVSS vector scores
1 official scoreWe 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.
CVSS:4.0/AV:A/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H——Primary CVE scoreVulnerability scoring details
Base CVSS 4.0 score
8.9HighVector: CVSS:4.0/AV:A/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Source materials
- CVE List V5 sourceCVE List V5
- https://cds.thalesgroup.com/enCVE reference
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
ICS Communications: Frail Security in Protocols
ICS Communications: Frail Security in Protocols represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.