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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.

PUBLISHED Reserved 2026-02-25 | Published 2026-05-18 | Updated 2026-05-18 | Assigner WPScan

Problem types

CWE-79 Cross-Site Scripting (XSS)

Product status

Default status
unaffected

Any version before 3.1.15
affected

Default status
unaffected

Any version before 2.4.2
affected

Default status
unaffected

Any version before 7.7.9
affected

Credits

Matthew Rollings finder

WPScan coordinator

References

wpscan.com/...rability/3ceabf11-23cd-4c38-ba14-014348b0ff2d/ exploit vdb-entry technical-description

cve.org (CVE-2026-3220)

nvd.nist.gov (CVE-2026-3220)

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