What is CVE-2026-91049?

CVE-2026-91049 is a medium-severity vulnerability in Ewww Image Optimizer, classified under Cross-site Scripting. CVSS score: 6.4/10. Published 2026-11-05.

How severe is CVE-2026-91049?

Medium severity. CVSS v3 base score is 6.4 out of 10.

XSS in Ewww Image Optimizer

CVE-2026-91049

The EWWW Image Optimizer WordPress plugin before 8.9.1 does not properly sanitize and restrict a value in post content before using it to dynamically load and execute a script in the page, allowing authenticated attackers with author-level access and above to inject arbitrary web scripts that run in the session of any user who views the affected page, including administrators. This is an incomplete fix of CVE-2026-15446: the origin and path restrictions added from 8.7.4 onward were each bypassable, so versions 8.7.4 through 8.9.0 remain affected.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-11-05 · last modified 2026-11-06.

CVSS v3 metric

CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:N/AC:H/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

Ewww Image Optimizer

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

wpscan.com/vulnerability/cdaf3779-3e8a-4997-9868-707bcc06f9a7/ (technical-description, exploit, vdb-entry)

Frequently asked questions

What is CVE-2026-91049?: CVE-2026-91049 is a medium-severity vulnerability in Ewww Image Optimizer, classified under Cross-site Scripting. CVSS score: 6.4/10. Published 2026-11-05.
How severe is CVE-2026-91049?: Medium severity. CVSS v3 base score is 6.4 out of 10.