SB2026032503 - Multiple vulnerabilities in WebKitGTK+ and WPE WebKit

Description

This security bulletin contains information about 7 secuirty vulnerabilities.

1) Information disclosure (CVE-ID: CVE-2026-20691)

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to excessive data output by the WebKit Sandboxing component. A remote attacker can gain fingerprint the user. 

2) Universal cross-site scripting (CVE-ID: CVE-2026-28871)

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data in WebKit. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of an arbitrary website.

3) Memory corruption (CVE-ID: CVE-2026-28859)

The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to improper input validation in WebKit when processing web content. A remote attacker can trick the victim into visiting a specially crafted website and force the browser into processing restricted web content outside the sandbox.

4) State Issues (CVE-ID: CVE-2026-28861)

The vulnerability allows a remote attacker to disclose sensitive information.

The vulnerability exists due to improper handling of web content in WebKit when processing malicious web pages. A remote attacker can entice the victim to visit a specially crafted website and access script message handlers intended for other origins.

5) State Issues (CVE-ID: CVE-2026-20665)

The vulnerability allows a remote attacker to bypass implemented security restrictions.

The vulnerability exists due to a state management issue in WebKit. A remote attacker can trick the victim into visiting a specially crafted website and prevent Content Security Policy from being enforced.

6) Memory corruption (CVE-ID: CVE-2026-28857)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary error in WebKit. A remote attacker can trick the victim into opening a specially crafted file and perform an unexpected process crash.

7) Memory corruption (CVE-ID: CVE-2026-20664)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary error in WebKit. A remote attacker can trick the victim into opening a specially crafted file and perform an unexpected process crash.

Remediation

Install update from vendor's website.

References

• https://support.apple.com/en-us/126794
• https://webkitgtk.org/security/WSA-2026-0002.html