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CVE-2026-27212

Swiperjs Swiper authentication bypass

7.8 HIGHPublic exploitEPSS 0.51%
  1. Published21 Feb 2026

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 3.1 breakdown

Attack vectorLocal
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

Swiperjs Swiper≥ 6.5.1 < 12.1.2

Remediation

Fixed in
Swiperjs Swiper≥ 12.1.2

References

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Frequently asked

Is CVE-2026-27212 being actively exploited?

CVE-2026-27212 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.51%.

How severe is CVE-2026-27212?

CVE-2026-27212 has a CVSS 3.1 base score of 7.8, rated high. EPSS estimates a 0.51% probability of exploitation.

Which products are affected by CVE-2026-27212?

Affected products include Swiperjs Swiper.

How do I fix CVE-2026-27212?

Upgrade affected software to a fixed version, for example Swiperjs Swiper 12.1.2 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-27212 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.