CVE-2026-3228
CVE-2026-3228 is a medium-severity vulnerability with a CVSS 3.x base score of 6.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.
Key facts
- Severity: Medium (CVSS 3.x base score 6.4)
- EPSS exploit prediction: 4% (90th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-10484
- Weakness: CWE-79
- Published:
- Last modified:
Description
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.
Frequently asked questions
- What is 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.
- How severe is CVE-2026-3228?
- CVE-2026-3228 has a CVSS 3.x base score of 6.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
- Is CVE-2026-3228 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2026-3228?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2026-3228 have an EU (EUVD) identifier?
- Yes. CVE-2026-3228 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10484.
- When was CVE-2026-3228 published?
- CVE-2026-3228 was published on 2026-03-10 and last updated on 2026-06-17.
References
- https://plugins.trac.wordpress.org/browser/social-networks-auto-poster-facebook-twitter-g/tags/4.4.6/inc-cl/fb.php#L581
- https://plugins.trac.wordpress.org/browser/social-networks-auto-poster-facebook-twitter-g/trunk/inc-cl/fb.php#L581
- https://plugins.trac.wordpress.org/changeset/3470727/social-networks-auto-poster-facebook-twitter-g/trunk/inc-cl/fb.php
- https://www.wordfence.com/threat-intel/vulnerabilities/id/923c51ba-0ec2-4e32-a86e-404f3fe2ac7c?source=cve
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