What is CVE-2026-121519?

CVE-2026-121519 is a medium-severity vulnerability in Themeisle Social Slider Feed – Media & Gallery Widgets, classified under Cross-site Scripting. CVSS score: 6.4/10. Published 2026-11-07.

How severe is CVE-2026-121519?

Medium severity. CVSS v3 base score is 6.4 out of 10.

XSS in Themeisle Social Slider Feed – Media & Gallery Widgets

CVE-2026-121519

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.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-11-07 · last modified 2026-11-07.

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

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Themeisle Social Slider Feed – Media & Gallery Widgets

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

Frequently asked questions

What is CVE-2026-121519?: CVE-2026-121519 is a medium-severity vulnerability in Themeisle Social Slider Feed – Media & Gallery Widgets, classified under Cross-site Scripting. CVSS score: 6.4/10. Published 2026-11-07.
How severe is CVE-2026-121519?: Medium severity. CVSS v3 base score is 6.4 out of 10.