Vulnerability in Nexter Blocks

CVE-2026-17011

The Nexter Blocks WordPress plugin before 5.0.2 does not restrict who can save global CSS through one of its REST endpoints, allowing users with at least the Contributor role to store arbitrary CSS that is rendered site-wide on the front end, enabling defacement, content hiding, and UI redressing.

Published · last modified .

CVSS v3 metric

CVSS v3 base score 3.8 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:L.

EPSS exploit prediction

EPSS: 0.001 (2.0th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 2nd percentile — 2.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-17011: held from 0.001 to 0.001.

EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: 0.000

Affected products

  • Nexter Blocks — versions 0

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-17011?
CVE-2026-17011 is a low-severity vulnerability in Nexter Blocks, classified under Insufficient Verification of Data Authenticity. CVSS score: 3.8/10. Published 2026-08-09.
How severe is CVE-2026-17011?
Low severity. CVSS v3 base score is 3.8 out of 10.