CVE-2026-35063 Missing Authorization in OpenPLC_V3

What is CVE-2026-35063?

CVE-2026-35063 is a high-severity missing authorization vulnerability in OpenPLC_V3, published on 9 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

OpenPLC_V3 REST API endpoint checks for JWT presence but never verifies the caller's role. Any authenticated user with role=user can delete any other user, including administrators, by specifying their user ID or they can create new accounts with role=admin, escalating to full administrator access.

Weakness: CWE-862

Which versions are affected by CVE-2026-35063?

It affects 1 product.

Products include Openplcproject Openplc V3 Firmware.

How do I fix CVE-2026-35063?

No fix has been published for CVE-2026-35063 yet. Limit exposure of the affected software until one is available.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2026-35063 being exploited?

There is no known exploitation of CVE-2026-35063 in the wild and no public exploit code.

Other vulnerabilities in OpenPLC_V3

• CVE-2026-28205 Initialization of a resource with an insecure default in OpenPLC_V3 Critical 9.2
• CVE-2026-35556 Plaintext storage of a password in OpenPLC_V3 Critical 9.2
• CVE-2024-34026 Memory corruption in OpenPLC v3 Critical 9.0
• CVE-2021-31630 Command injection in n/a High 8.8
• CVE-2024-36980 Denial of service in OpenPLC v3 High 7.5

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-mg9q-6j4v-6j49.