What is CVE-2026-109933?

CVE-2026-109933 is a medium-severity vulnerability in Otter Blocks, classified under Cross-site Scripting. CVSS score: 6.8/10. Published 2026-10-23.

How severe is CVE-2026-109933?

Medium severity. CVSS v3 base score is 6.8 out of 10.

XSS in Otter Blocks

CVE-2026-109933

The Otter Blocks WordPress plugin before 3.2.8 does not properly sanitize and escape user-supplied block styling values before writing them into an inline stylesheet, allowing users with contributor-level access and above to inject arbitrary web scripts that execute when any visitor, including administrators, views the affected post.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-10-23 · last modified 2026-10-23.

CVSS v3 metric

CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Otter Blocks

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

wpscan.com/vulnerability/a2a19770-9ee2-4164-9ea6-a882cf0085e9/ (technical-description, exploit, vdb-entry)

Frequently asked questions

What is CVE-2026-109933?: CVE-2026-109933 is a medium-severity vulnerability in Otter Blocks, classified under Cross-site Scripting. CVSS score: 6.8/10. Published 2026-10-23.
How severe is CVE-2026-109933?: Medium severity. CVSS v3 base score is 6.8 out of 10.