XSS in Nextscripts Nextscripts: Social Networks Auto-Poster

CVE-2026-3228

The NextScripts: Social Networks Auto-Poster plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the `[nxs_fbembed]` shortcode in all versions up to, and including, 4.4.6. This is due to insufficient input sanitization and output escaping on the `snapFB` post meta value. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Vulnerability class: XSS (Cross-Site Scripting)

Published · last modified .

CVSS v3 metric

CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.003 (23.8th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 24th percentile — 23.8% 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-2026-3228: fell from 0.037 to 0.003.

EPSS over last 30 days · oldest: 0.037 · newest: 0.003 · change: -0.033

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2026-3228?
CVE-2026-3228 is a medium-severity vulnerability in Nextscripts Nextscripts: Social Networks Auto-Poster, classified under Cross-site Scripting. CVSS score: 6.4/10. Published 2026-03-10.
How severe is CVE-2026-3228?
Medium severity. CVSS v3 base score is 6.4 out of 10.
Is CVE-2026-3228 known to be exploited?
1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.