8.8

CVE-2026-3220: unknown autoptimize Cross-site Scripting

CVSS: 8.8v3.1HighDeferred
Published 18-05-2026Last modified 18-05-2026
Open JSON

Vulnerability summary

CVE-2026-3220 is a high (CVSS 8.8) Cross-site Scripting vulnerability in unknown autoptimize. EPSS estimates a 0.45% chance of exploitation in the next 30 days, higher than 37.6% of scored vulnerabilities. 1 public exploit is recorded. Fixed in 3.1.15 and 7.7.9.

Overall risk
45/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.45%
0%100%
Low · +0.13 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference

Timeline

  1. 18-05-2026
    PublishedVulnerability first disclosed.
  2. 18-05-2026
    Last modifiedVulnerability information updated.

Description

The Autoptimize WordPress plugin before 3.1.15, Clearfy Cache WordPress plugin before 2.4.2, Speed Optimizer WordPress plugin before 7.7.9 are vulnerable to unauthenticated Stored Cross-Site Scripting (XSS) due to a predictable replacement hash used during the HTML minification process and abusing a regular expression. This allows an attacker to inject arbitrary HTML attributes in the final HTML output by anticipating the placeholder format.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.45%

Chance of exploitation in the next 30 days

Percentile

38%

Versus all other CVEs

30-day change

+0.13 pp

From 0.32% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.45%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (wpscan.com)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Unknown3 products
Wordpress3 products
  • autoptimize< 3.1.15
  • clearfy< 2.4.2
  • unknown-cve-2024-32532-1< 7.7.9

2 vendors · 6 products

References

2 links