Medium

Sensitive information disclosure on locked Apple devices via Siri

IdentifiersCVE-2026-28856CWE-306

CVE-2026-28856 is an authentication flaw in Siri affecting Apple platforms including iOS 26.4 and earlier, iPadOS 26.4 and earlier, visionOS 26.4 and earlier, and watchOS 26.4 and earlier. Apple states that the issue was addressed with improved authentication. The vulnerability allows an attacker with physical access to a locked device to view sensitive user information through Siri despite the device being in a locked state. The available advisory text does not identify the specific vulnerable function or code path beyond Siri and the authentication weakness.

For your environment

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation can disclose sensitive user information from a locked device, resulting in a lock-screen privacy bypass. The impact is limited to information exposure based on the available advisory text; there is no evidence in the provided content of code execution, privilege escalation, or device compromise.

Mitigation

If you can’t patch tonight, do this now.

Until patches can be applied, reduce lock-screen exposure by restricting or disabling Siri access while the device is locked, and maintain physical control of devices to prevent hands-on access by unauthorized users. Because the vendor attributes the issue to insufficient authentication, minimizing lock-screen assistant functionality is the most relevant interim mitigation based on the available information.

Remediation

Patch, then assume compromise.

Apply the vendor fixes released by Apple in iOS 26.4, iPadOS 26.4, visionOS 26.4, and watchOS 26.4. The issue was remediated by improved authentication in Siri. Upgrade affected devices to the patched OS version or later.

PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType

AppleIosoperating_system

AppleIpadosoperating_system

AppleIphone Osoperating_system

AppleVisionosoperating_system

AppleWatchosoperating_system

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

3 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.

3 SOURCESView more in app

No news coverage yet. Advisories and community discussion only.

What this page doesn’t show

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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity3