# CVE-2026-21132: Samsung Internet improper input validation script injection

Source: https://junglewise.ai/threats/cve-2026-21132-improper-input-validation-in-samsung-internet-prior-to-version-30  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-12. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-21132 · Severity: info · Published 2026-10-12

Samsung Internet is a mobile web browser used to access websites and web content. A flaw in how the browser validates user input allows attackers to inject and execute arbitrary JavaScript code when a user visits a malicious website, potentially enabling account hijacking, credential theft, or malware installation.

Technologies: [Samsung Internet](https://junglewise.ai/threats/technologies/internet). Vendors: [Samsung](https://junglewise.ai/threats/vendors/samsung).

## Quick answers

**Is CVE-2026-21132 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-21132 being exploited in the wild.

**How severe is CVE-2026-21132?** Informational severity, published 12 October 2026.

**Which products and versions are affected?** Samsung Internet prior to 30.0.5.24.

**Is there a fix for CVE-2026-21132?** Yes: fixed in 30.0.5.24. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-21132 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-21132?** Check whether you run Samsung Internet at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in 30.0.5.24

## Technical details

The vulnerability is an improper input validation flaw in Samsung Internet's handling of script content, allowing cross-site scripting (XSS) injection. The attack vector is network-based and requires user interaction (visiting a malicious page). An attacker can inject arbitrary script that executes in the context of the victim's browser, gaining access to session data, cookies, and sensitive information.

## Affected products

- Samsung Internet prior to 30.0.5.24

## Timeline

- 2026-10-12: disclosed: Published by Samsung Mobile Security
- 2026-10: patched: Samsung Internet 30.0.5.24 released

## References

- [https://security.samsungmobile.com/serviceWeb.smsb?year=2026&month=10](https://security.samsungmobile.com/serviceWeb.smsb?year=2026&month=10)

## Related threats

- [Samsung Internet improper access control allows local information access](https://junglewise.ai/threats/cve-2026-21135-improper-access-control-in-samsung-internet-prior-to-version-30-0)
- [Samsung Internet improper authorization allows local data access](https://junglewise.ai/threats/cve-2026-21036-samsung-internet-improper-authorization-allows-local-data-access)
- [Improper input validation in Samsung Internet prior to version 29.0.0.48 allows local attackers to inject arbitrary script.](https://junglewise.ai/threats/cve-2025-58485-improper-input-validation-in-samsung-internet-prior-to-version-29)