Auth bypass in Burstbv Burst Statistics – Privacy-Friendly WordPress Analytics (Google Alternative)

CVE-2026-8181

The Burst Statistics – Privacy-Friendly WordPress Analytics (Google Analytics Alternative) plugin for WordPress is vulnerable to Authentication Bypass in versions 3.4.0 to 3.4.1.1. This is due to incorrect return-value handling in the `is_mainwp_authenticated()` function when validating application passwords from the Authorization header. This makes it possible for unauthenticated attackers, with knowledge of an administrator username, to impersonate that administrator for the duration of the request by supplying any random Basic Authentication password achieving privilege escalation.

Vulnerability class: Broken Authentication

Published · last modified .

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.030 (86.9th percentile), scored .

Low probability of exploitation in the next 30 days, but still tracked. 87th percentile — 86.9% 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-2026-8181: fell from 0.146 to 0.030.

EPSS over last 30 days · oldest: 0.146 · newest: 0.030 · change: -0.116

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2026-8181?
CVE-2026-8181 is a critical-severity vulnerability in Burstbv Burst Statistics – Privacy-Friendly WordPress Analytics (Google Alternative), classified under Improper Authentication. CVSS score: 9.8/10. Published 2026-05-14.
How severe is CVE-2026-8181?
Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2026-8181 known to be exploited?
14 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.