CVE-2026-12068: Avira Password Manager Info Disclosure

CVE-2026-12068 Overview

CVE-2026-12068 is an information disclosure vulnerability in Avira Password Manager when used with Mozilla Firefox. The flaw allows a remote attacker operating a cross-origin iframe to obtain credentials autofilled for the parent web page. The root cause is incorrect autofill field selection, classified under [CWE-669] Incorrect Resource Transfer Between Spheres. The issue affects Avira Password Manager on Windows, macOS, and Linux when paired with Firefox.

Critical Impact
An attacker controlling a cross-origin iframe embedded on a legitimate page can harvest credentials that the Avira Password Manager extension autofills, leading to account compromise across services where the victim relies on autofill.

Affected Products

Avira Password Manager extension for Mozilla Firefox on Windows
Avira Password Manager extension for Mozilla Firefox on macOS
Avira Password Manager extension for Mozilla Firefox on Linux

Discovery Timeline

2026-06-12 - CVE-2026-12068 published to the National Vulnerability Database
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2026-12068

Vulnerability Analysis

The vulnerability resides in how the Avira Password Manager Firefox extension determines which fields qualify for credential autofill. When a parent page embeds a cross-origin iframe, the extension fails to correctly scope the autofill target. As a result, credentials intended for the parent origin can be inserted into form fields rendered by an attacker-controlled iframe.

The attacker hosts the iframe content on a domain they control. They craft hidden or disguised input fields that match the heuristics used by the password manager. When the victim triggers autofill on the parent page, the extension populates the iframe's fields with the parent origin's credentials. The attacker then exfiltrates the values through standard form submission or JavaScript event handlers inside the iframe.

Exploitation requires user interaction, typically a click or focus event that initiates the autofill flow. The scope is changed because credentials belonging to one security origin cross into another, which aligns with CWE-669.

Root Cause

The extension applies autofill logic without enforcing strict same-origin checks between the targeted form field and the credential's associated origin. Fields inside a cross-origin iframe are treated as eligible targets for credentials bound to the top-level document.

Attack Vector

The attack is network-based and remote. An attacker convinces a victim to visit a page that embeds an attacker-controlled iframe, or places malicious iframes on compromised third-party sites. No authentication is required on the attacker side, and the victim only needs to trigger the autofill action. The vulnerability mechanism is documented in the GenDigital Security Advisory.

Detection Methods for CVE-2026-12068

Indicators of Compromise

Unexpected outbound form submissions from browser sessions to unfamiliar third-party domains immediately after autofill activity.
Browser telemetry showing cross-origin iframes receiving input events on password or username fields.
Authentication logs revealing successful logins from new geographic locations or IP addresses shortly after users visited untrusted sites.

Detection Strategies

Inspect web proxy and DNS logs for connections to low-reputation domains correlated with sessions where the Avira Password Manager extension is active.
Monitor identity provider logs for credential reuse anomalies on accounts known to be stored in the password manager.
Enumerate installed browser extensions across managed endpoints and flag vulnerable versions of Avira Password Manager paired with Firefox.

Monitoring Recommendations

Enable browser extension inventory collection through endpoint management tooling.
Alert on high volumes of failed authentication followed by a single success from a new source, a pattern consistent with stolen autofilled credentials.
Correlate user web browsing telemetry with subsequent authentication events to spot credential theft chains.

How to Mitigate CVE-2026-12068

Immediate Actions Required

Update Avira Password Manager to the latest version released by Gen Digital that addresses this advisory.
Disable autofill features in Avira Password Manager and require manual copy-paste or click-to-fill until the patch is deployed.
Rotate credentials for high-value accounts that may have been exposed through autofill on untrusted pages.

Patch Information

Gen Digital, the parent company of Avira, publishes fix details and affected version ranges through its security advisory portal. Review the GenDigital Security Advisory for the current patched version and apply updates through the extension's automatic update mechanism in Firefox.

Workarounds

Configure Firefox enterprise policies to block third-party iframes on sensitive sites, reducing the attack surface for cross-origin autofill abuse.
Instruct users to disable the Avira Password Manager Firefox extension and rely on manual credential entry until patched.
Apply content security policies on internally hosted web applications that restrict iframe embedding via frame-ancestors and Content-Security-Policy headers.

bash

# Example Firefox enterprise policy to restrict extension and enforce CSP behavior
# policies.json placed in the Firefox distribution directory
{
  "policies": {
    "ExtensionSettings": {
      "{446900e4-71c2-419f-a6a7-df9c091e268b}": {
        "installation_mode": "blocked",
        "blocked_install_message": "Avira Password Manager blocked pending CVE-2026-12068 remediation"
      }
    },
    "Preferences": {
      "signon.autofillForms": {
        "Value": false,
        "Status": "locked"
      }
    }
  }
}