Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Swiperjs | Swiper | >= 6.5.1, < 12.1.2 |
Related Weaknesses (CWE)
References
- https://github.com/nolimits4web/swiper/commit/d3e663322a13043ca63aaba235d8cf3900Patch
- https://github.com/nolimits4web/swiper/releases/tag/v12.1.2Product
- https://github.com/nolimits4web/swiper/security/advisories/GHSA-hmx5-qpq5-p643ExploitVendor Advisory
FAQ
What is CVE-2026-27212?
CVE-2026-27212 is a vulnerability with a CVSS score of 7.8 (HIGH). 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...
How severe is CVE-2026-27212?
CVE-2026-27212 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-27212?
Check the references section above for vendor advisories and patch information. Affected products include: Swiperjs Swiper.