Is CVE-2026-75843 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-75843 being exploited in the wild.

How severe is CVE-2026-75843?

Critical severity, with a CVSS score of 9.9, published 18 August 2026.

Which products and versions are affected?

ArcadeData ArcadeDB before 26.8.1.

Is there a fix for CVE-2026-75843?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-75843 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-75843?

Check whether you run ArcadeData ArcadeDB at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-75843: ArcadeDB gRPC transaction privilege escalation via authentication bypass

CVE-2026-75843 · Severity: critical · CVSS 9.9 · Published 2026-08-18

ArcadeDB is a distributed database platform that supports JavaScript scripting and role-based access control. A flaw in the gRPC transaction handler allows any authenticated reader to bypass scripting authorization checks and execute unrestricted JavaScript code, enabling attackers to create server-wide administrator accounts and achieve full system compromise equivalent to remote code execution.

Technologies: ArcadeData ArcadeDB. Vendors: ArcadeData.

Quick answers

Is CVE-2026-75843 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-75843 being exploited in the wild.
How severe is CVE-2026-75843?: Critical severity, with a CVSS score of 9.9, published 18 August 2026.
Which products and versions are affected?: ArcadeData ArcadeDB before 26.8.1.
Is there a fix for CVE-2026-75843?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-75843 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-75843?: Check whether you run ArcadeData ArcadeDB at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

ArcadeDB's gRPC service fails to bind the authenticated principal (via setCurrentUser) when creating a dedicated single-thread executor for external transactions in the beginTransaction method (ArcadeDbGrpcService.java:1468-1476). When executeCommand is invoked with a transaction ID, it dispatches the command onto this executor thread where the current user context remains null. The scripting authorization gate in LocalDatabase.java:721-723 performs an early-return check that is ineffective on null users, allowing JavaScript commands to execute without UPDATE_SECURITY permission checks. An authenticated reader (low privileges) can call BeginTransaction to obtain a transaction ID, then invoke ExecuteCommand with language="js" to execute arbitrary JavaScript—for example, calling database.getSecurity().createUser() to create a server-wide administrator account. The gRPC plugin is enabled by default and shipped in the standard distribution. Patched in version 26.8.1.

Affected products

ArcadeData ArcadeDB before 26.8.1

Timeline

2026-08-04: disclosed
2026-08-18: advisory

References

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