CVE-2026-27212
High · 7.8CVSS
7.8
EPSS
0.6%
Published
Feb 21, 2026
CISA due date
—
The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| npm | swiper | 6.5.1 | 12.1.2 |
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