CVE-2026-27212 – Swiper has a Prototype Pollution Vulnerability

CVE ID : CVE-2026-27212

Published : Feb. 21, 2026, 6:17 a.m. | 47 minutes ago

Description : Swiper is a free and mobile touch slider with hardware accelerated transitions and native behavior. Versions 6.5.1 through 12.1.1 have a Prototype pollution vulnerability. The vulnerability resides in line 94 of shared/utils.mjs, where the indexOf() function is used to check whether user provided input contain forbidden strings. Despite a previous fix that attempted to mitigate prototype pollution by checking whether user input contained a forbidden key, it is still possible to pollute Object.prototype via a crafted input using Array.prototype. The exploit works across Windows and Linux and on Node and Bun runtimes. Any application that processes attacker-controlled input using this package may be affected by the following: Authentication Bypass, Denial of Service and RCE. This issue is fixed in version 12.1.2.

Severity: 9.4 | CRITICAL

Visit the link for more details, such as CVSS details, affected products, timeline, and more…