How severe is CVE-2026-35063?

CVE-2026-35063 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-35063 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (15th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-35063?

CVE-2026-35063 affects Openplcproject Openplc V3 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-35063?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-35063 have an EU (EUVD) identifier?

Yes. CVE-2026-35063 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21035.

When was CVE-2026-35063 published?

CVE-2026-35063 was published on 2026-04-09 and last updated on 2026-06-17.

CVE-2026-35063

CVE-2026-35063 is a high-severity vulnerability in Openplcproject Openplc V3 Firmware with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-862.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v4: 8.7
EPSS exploit prediction: 0% (15th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-21035
Weakness: CWE-862
Affected product: Openplcproject Openplc V3 Firmware
Published: 2026-04-09
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-35063?: 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.
How severe is CVE-2026-35063?: CVE-2026-35063 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-35063 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (15th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-35063?: CVE-2026-35063 affects Openplcproject Openplc V3 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-35063?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-35063 have an EU (EUVD) identifier?: Yes. CVE-2026-35063 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21035.
When was CVE-2026-35063 published?: CVE-2026-35063 was published on 2026-04-09 and last updated on 2026-06-17.

References

https://www.cisa.gov/news-events/ics-advisories/icsa-25-345-10

Affected products (1)

cpe:2.3:o:openplcproject:openplc_v3_firmware:-:*:*:*:*:*:*:*

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