CVE-2023-36787Public exploitNetwork attack vector

Code execution via PDF addIcon type confusion

Published Aug 21, 2023 · Updated Aug 10, 2026

Type confusion in Microsoft Edge before 116.0.1938.54 allows remote attackers to corrupt memory through a crafted PDF document. The Acrobat-based MSDCPDF engine's JavaScript addIcon function accepts a field object as an icon because native argument validation fails, then dereferences an unexpected pointer. Exploitation requires a user to open the malicious PDF in Edge and can produce attacker-influenced memory writes, a browser crash, or code execution.

CVSS severity8.1
High
EPSS probability1.98%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Type confusion in Microsoft Edge before 116.0.1938.54 allows remote attackers to corrupt memory through a crafted PDF document. The Acrobat-based MSDCPDF engine's JavaScript addIcon function accepts a field object as an icon because native argument validation fails, then dereferences an unexpected pointer. Exploitation requires a user to open the malicious PDF in Edge and can produce attacker-influenced memory writes, a browser crash, or code execution.

The record

CVE
CVE-2023-36787
Published
Aug 21, 2023
Updated
Aug 10, 2026
Vendor
Microsoft
Product
Microsoft Edge (Chromium-based)
Classifications
CWE-843, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 21, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=1.0.0.0 <116.0.1938.54

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · Microsoft Edge (Chromium-based)version=1.0.0.0 <116.0.1938.54

Published CVSS scores

8.1Cisco TalosCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-843Access of Resource Using Incompatible Type ('Type Confusion')
T1203Exploitation for Client Execution

Public exploit references

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

Technologies

Your stack

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Your stack

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