What’s Vulnerable › Vulnerabilities

CVE-2026-105281: Grid Protection Alliance openPDC and openHistorian Missing Authentication for Critical Function

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-09 · updated 2026-10-11
• Weakness: CWE-306

Description

The internal data publisher on openPDC accepts network connections without authentication in its default configuration. An unauthenticated network attacker can connect to this interface and retrieve the complete device and measurement topology of the system.

Affected products

• Grid Protection Alliance openHistorian: before 2.8.580; before 2.8.585 — fixed in 2.8.580, 2.8.585
• Grid Protection Alliance openPDC: before 2.9.477; before 2.9.482 — fixed in 2.9.477, 2.9.482
• Grid Protection Alliance openPDC (Docker image): before 2.9.477; before 2.9.482 — fixed in 2.9.477, 2.9.482

How to fix

Upgrade to a fixed version: Grid Protection Alliance openHistorian 2.8.580, 2.8.585; Grid Protection Alliance openPDC 2.9.477, 2.9.482; Grid Protection Alliance openPDC (Docker image) 2.9.477, 2.9.482. Check the vendor advisory for mitigations.

References

• https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-281-02.json
• https://www.cisa.gov/news-events/ics-advisories/icsa-26-281-02

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