# CVE-2026-121519: Social Slider Feed <= 2.3.8 - Authenticated (Subscriber+) Stored Cross-Site Scripting via 'slidespeed' Parameter

Status: published. Published: 2026-11-07. Updated: 2026-11-07.

The Social Slider Feed – Social Media Feed & Gallery Widgets plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'slidespeed' parameter in all versions up to, and including, 2.3.8 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with subscriber-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The missing current_user_can() check in the Factory framework's connect() dispatcher allows Subscriber-level users to bypass the manage_options capability gate and both harvest a valid wis_edit_feed nonce and overwrite any feed's slidespeed setting, after which the stored payload fires on every public pageview embedding the feed shortcode.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- themeisle / Social Slider Feed – Social Media Feed & Gallery Widgets: ≥ 0; ≤ 2.3.8 (affected, semver). Source: CNA: Wordfence

## Severity and prioritization

- CVSS 3.1: 6.4 (medium); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N; source: CNA: Wordfence

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-79

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/3ae890e7-a5b6-41c5-bc30-792c0b9272a6?source=cve (CNA: Wordfence)

- https://plugins.trac.wordpress.org/browser/instagram-slider-widget/tags/2.3.8/components/instagram/html_templates/templates/slider.php#L67 (CNA: Wordfence)

- https://plugins.trac.wordpress.org/browser/instagram-slider-widget/tags/2.3.8/libs/factory/pages/includes/admin-page.class.php#L342 (CNA: Wordfence)

- https://plugins.trac.wordpress.org/browser/instagram-slider-widget/tags/2.3.8/admin/pages/feeds.php#L219 (CNA: Wordfence)

- https://plugins.trac.wordpress.org/browser/instagram-slider-widget/tags/2.3.8/includes/class-feeds.php#L105 (CNA: Wordfence)

- https://plugins.trac.wordpress.org/browser/instagram-slider-widget/tags/2.3.8/components/instagram/html_templates/templates/slider-overlay.php#L72 (CNA: Wordfence)

- https://plugins.trac.wordpress.org/browser/instagram-slider-widget/tags/2.3.9 (CNA: Wordfence)

## Provenance

- CNA: Wordfence: https://www.cve.org/CVERecord?id=CVE-2026-121519; retrieved 2026-11-07; source updated 2026-11-07

Revision: b4c59a953b6084800235a824da98627fe5778cb454ece049c9ba3d11b8c2bdd9

Canonical: https://y2.dev/cve/CVE-2026-121519

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