CVE-2026-100730 Grid Protection Alliance openPDC and openHistorian Deserialization of Untrusted Data
An attacker can trigger unsafe deserialization in openPDC and openHistorian, potentially achieving remote code execution under the service account privileges.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-100730?
CVE-2026-100730 is a critical unsafe deserialization vulnerability in Grid Protection Alliance openHistorian, published on 9 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A service console interface on openPDC and openHistorian deserializes a client-supplied data structure. On systems using Windows Authentication, an attacker must already be authenticated to reach this function; on systems without Windows Authentication, this is reachable by an unauthenticated network attacker. This allows an attacker to trigger deserialization of an arbitrary object graph, which could allow remote code execution under the privileges of the affected service account.
Weakness: CWE-502
Which versions are affected by CVE-2026-100730?
How do I fix CVE-2026-100730?
No fix has been published for CVE-2026-100730 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2026-100730 being exploited?
There is no known exploitation of CVE-2026-100730 in the wild and no public exploit code.
Sources
Also known as GHSA-g2gc-jv32-q89f.