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CVE-2025-3581: Newsletter < 8.8.5 - Admin+ Stored XSS via Widget

Description

The Newsletter WordPress plugin before 8.8.5 does not validate and escape some of its Widget options before outputting them back in a page/post where the block is embed, which could allow high privilege users such as admin to perform Stored Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed (for example in multisite setup).

Classification

CVE ID: CVE-2025-3581

Problem Types

CWE-79 Cross-Site Scripting (XSS)

Affected Products

Vendor: Unknown

Product: Newsletter

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.03% (probability of being exploited)

EPSS Percentile: 5.19% (scored less or equal to compared to others)

EPSS Date: 2025-06-12 (when was this score calculated)

References

https://nvd.nist.gov/vuln/detail/CVE-2025-3581
https://wpscan.com/vulnerability/2d96f018-510d-40ab-9e73-76fa44784813/

Timeline