CVE-2026-85479Network attack vectorHinoki check available

Data disclosure via unauthenticated STTP publisher

Published Oct 9, 2026 · Updated Oct 9, 2026

Missing authentication in openPDC and openHistorian allows remote attackers to read publisher data through the STTP network interface. The STTP-based data publisher accepts connections and exchanges data without authenticating clients in its default configuration. Exploitation requires network reachability to the publisher; the documented consequence is data disclosure, not data modification or service interruption.

CVSS severity6.9
Medium
EPSS probability0.25%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Missing authentication in openPDC and openHistorian allows remote attackers to read publisher data through the STTP network interface. The STTP-based data publisher accepts connections and exchanges data without authenticating clients in its default configuration. Exploitation requires network reachability to the publisher; the documented consequence is data disclosure, not data modification or service interruption.

The record

CVE
CVE-2026-85479
Published
Oct 9, 2026
Updated
Oct 9, 2026
Vendor
Grid Protection Alliance
Product
openPDC
Classifications
CWE-306, T0802
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <2.9.477
  2. Affected versionversion=0 <2.9.482

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Grid Protection Alliance · openPDCversion=0 <2.9.477; version=0 <2.9.482
Grid Protection Alliance · openHistorianversion=0 <2.8.580; version=0 <2.8.585

Published CVSS scores

5.3CISACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
6.9CISACVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
T0802Automated Collection

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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