What is CVE-2026-81571?

CVE-2026-81571 is a medium-severity vulnerability in Brave, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 4.8/10. Published 2026-09-02.

How severe is CVE-2026-81571?

Medium severity. CVSS v3 base score is 4.8 out of 10.

Vulnerability in Brave

CVE-2026-81571

The Brave WordPress plugin before 0.8.8 does not prevent a URL parameter used to pre-fill a form field from being passed to WordPress's shortcode engine, allowing unauthenticated attackers to have arbitrary shortcodes registered on the site executed server-side.

Published 2026-09-02 · last modified 2026-09-03.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.002 (14.4th percentile), scored 2026-10-18.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 14th percentile — 14.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.001

Affected products

Brave

Weakness classification (CWE)

CWE-74 — Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection)

References

wpscan.com/vulnerability/049d0bfc-962b-4f5b-a089-c45f4ad981e3/ (technical-description, exploit, vdb-entry)

Frequently asked questions

What is CVE-2026-81571?: CVE-2026-81571 is a medium-severity vulnerability in Brave, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 4.8/10. Published 2026-09-02.
How severe is CVE-2026-81571?: Medium severity. CVSS v3 base score is 4.8 out of 10.