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CVE Record

CVE-2026-3228: NextScripts: Social Networks Auto-Poster <= 4.4.6 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'nxs_fbembed' Shortcode

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.

MediumCVSS 6.4Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2026-3228 affects the WordPress plugin NextScripts: Social Networks Auto-Poster. A logged-in user with Contributor-level access or higher can store malicious script through a shortcode. That script may run when someone views the affected page, creating risk to site users or administrators.

Executive priority

Treat as a moderate-priority web risk. Prioritize multi-author WordPress sites and sites with external contributors. The main business concern is session abuse, unauthorized content changes, or reputational impact if malicious script runs for administrators or visitors.

Technical view

The issue is stored cross-site scripting in the `[nxs_fbembed]` shortcode caused by insufficient sanitization and escaping of the `snapFB` post meta value. Reported affected versions are up to and including 4.4.6. CVSS is 6.4, with low privileges required and changed scope.

Likely exposure

Exposure is likely limited to WordPress sites running this plugin at version 4.4.6 or earlier and allowing Contributor-level or higher users to create content. Risk increases where untrusted authors, compromised accounts, or multi-author workflows exist.

Exploitation context

The source bundle does not show CISA KEV listing or public evidence of active exploitation. Exploitation requires authenticated Contributor-level access or higher, but stored XSS can affect later viewers of the injected content, including privileged users.

Researcher notes

The affected-version statement says all versions up to and including 4.4.6. The provided affected CPE data is not detailed, so rely on the CVE description and Wordfence reference. A WordPress.org changeset is cited, but the bundle does not clearly name a fixed release.

Mitigation direction

  • Identify WordPress sites using NextScripts: Social Networks Auto-Poster.
  • Update to a vendor release that contains the fix when available.
  • If no fixed release is available, follow vendor guidance closely.
  • Restrict Contributor-level access to trusted accounts only.
  • Disable the plugin where it is not business-critical.
  • Review and remove suspicious `[nxs_fbembed]` shortcode content or related metadata.

Validation and detection

  • Confirm installed plugin name and version across WordPress assets.
  • Flag installations at version 4.4.6 or earlier.
  • Review posts using the `[nxs_fbembed]` shortcode.
  • Inspect relevant `snapFB` post meta for unexpected script-like content.
  • Check whether Contributor-level accounts are trusted and still required.
  • Monitor vendor and Wordfence pages for fixed-version details.
Prepared
Confidence
medium
Sources
6

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · medium confidence lookup

CWE-79: User-session and phishing behavior lookup

Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

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cve · low confidence lookup

CVE-2026-3228 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
6.4 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
0Timeline events
0ADP providers
5Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
6.4CVSS 3.1MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N3.12.7Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

6.4Medium
CVSS 3.1 vector shape for CVE-2026-3228Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
nextscriptsNextScripts: Social Networks Auto-Poster0unaffected
Weakness

CWE details

CWE-79

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-79 · source CWE mapping

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

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