CVE-2024-27086

Web-view injection and login denial via exported activity

Published Apr 16, 2024 · Updated Aug 2, 2024

Improper activity export in Microsoft Authentication Library for .NET allows local users to inject web content or block sign-in. AuthenticationAgentActivity is declared Exported=true, allowing another local application to launch its embedded web view and inject HTML or JavaScript. Exploitation requires a malicious application on the same device and user interaction; it can inject web content or prevent legitimate login.

CVSS severity3.9
Low
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Improper activity export in Microsoft Authentication Library for .NET allows local users to inject web content or block sign-in. AuthenticationAgentActivity is declared Exported=true, allowing another local application to launch its embedded web view and inject HTML or JavaScript. Exploitation requires a malicious application on the same device and user interaction; it can inject web content or prevent legitimate login.

The record

CVE
CVE-2024-27086
Published
Apr 16, 2024
Updated
Aug 2, 2024
Vendor
Microsoft
Product
Microsoft Authentication Library for .NET
Classifications
CWE-926, CWE-863
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Apr 16, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 4.48.0, < 4.59.1
  2. Affected versionversion=>= 4.60.0, < 4.60.3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

Microsoft · Microsoft Authentication Library for .NETversion=>= 4.48.0, < 4.59.1; version=>= 4.60.0, < 4.60.3

Published CVSS scores

3.9GitHub CNACVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-926Improper Export of Android Application Components
CWE-863Incorrect Authorization

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo