5.5

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

Analyzed
Published 09-06-2025Last modified 10-06-2025

Vulnerability summary

CVE-2025-3581 is a medium (CVSS 5.5) Cross-site Scripting vulnerability in thenewsletterplugin newsletter. EPSS estimates a 0.26% chance of exploitation in the next 30 days, higher than 16.5% of scored vulnerabilities. 1 public exploit is recorded. Fixed in 8.8.5.

Overall risk
32/100
0100
Medium · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v3.1 (wordfence)
EPSS score
0.26%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits1reference

Timeline

  1. 09-06-2025
    PublishedVulnerability first disclosed.
  2. 10-06-2025
    Last modifiedVulnerability information updated.

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).

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.26%

Chance of exploitation in the next 30 days

Percentile

17%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.26% on 24-09-2026

24-09-202624-10-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (wpscan.com)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Thenewsletterplugin1 product
Unknown1 product
Wordpress1 product
  • newsletter≤ 8.8.4 (fixed in 8.8.5)

3 vendors · 3 products

References

2 links