# CVE-2016-0028: Microsoft Exchange Information Disclosure Vulnerability

CVE-2016-0028 is fixed in 5 products on 1 platform, first by KB3150501, released June 14, 2016. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2016-0028
- Priority: High
- CVSS: n/a (Important)
- EPSS: 0.2255
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation Unlikely
- Published: Jun 14, 2016
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2016-0028

## Description

<p>An email filter bypass exists in the way that Microsoft Exchange parses HTML messages that could allow information disclosure. An attacker who successfully exploited the vulnerability could identify, fingerprint, and track a user online if the user views email messages using Outlook Web Access (OWA). An attacker could also combine this vulnerability with another one, such as a Cross-Site Request Forgery (CSRF), to amplify the attack.</p> <p>To exploit the vulnerability, an attacker could include specially crafted image URLs in OWA messages that could be loaded, without warning or filtering, from the attacker-controlled URL. This callback vector provides an information disclosure tactic used in web beacons and other types of tracking systems.</p> <p>The update corrects the way that Exchange parses HTML messages.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Microsoft Exchange Server 2013 Cumulative Update 11 |  | [KB3150501](https://patchblox.com/security/data/fix/microsoft/kb3150501.md) | Jun 14, 2016 |
| Microsoft | Microsoft Exchange Server 2013 Cumulative Update 12 |  | [KB3150501](https://patchblox.com/security/data/fix/microsoft/kb3150501.md) | Jun 14, 2016 |
| Microsoft | Microsoft Exchange Server 2013 Service Pack 1 |  | [KB3150501](https://patchblox.com/security/data/fix/microsoft/kb3150501.md) | Jun 14, 2016 |
| Microsoft | Microsoft Exchange Server 2016 |  | [KB3150501](https://patchblox.com/security/data/fix/microsoft/kb3150501.md) | Jun 14, 2016 |
| Microsoft | Microsoft Exchange Server 2016 Cumulative Update 1 |  | [KB3150501](https://patchblox.com/security/data/fix/microsoft/kb3150501.md) | Jun 14, 2016 |

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Data as of 2026-11-07T06:34:28Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo