SB2026091406 - Multiple vulnerabilities in Microsoft Edge

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Main Vulnerability Database SB2026091406

SB2026091406 - Multiple vulnerabilities in Microsoft Edge

Published: September 14, 2026

Security Bulletin ID SB2026091406
CSH Severity
Critical
Patch available
YES
Number of vulnerabilities 10
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

Critical 10% High 60% Medium 10% Low 20%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 10 vulnerabilities.


1) Out-of-bounds write (CVE-ID: CVE-2026-87491) Exploited

CWE-ID: CWE-787 - Out-of-bounds write

CVSSv4: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a boundary error when processing untrusted HTML content in V8. A remote attacker can create a specially crafted web page, trick the victim into opening it, trigger out-of-bounds write and execute arbitrary code on the target system.

Note, the vulnerability is being actively exploited in the wild.


2) Exposure of Resource to Wrong Sphere (CVE-ID: CVE-2026-85053)

CWE-ID: CWE-668 - Exposure of resource to wrong sphere

CVSSv4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to access improperly exposed resources.

The vulnerability exists due to improper resource exposure in CacheStorage when handling cached resources. A remote attacker can cause a victim to access improperly exposed cached resources to access improperly exposed resources.


3) Out-of-bounds read (CVE-ID: CVE-2026-85052)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition within the CrashReporting component in Google Chrome. A remote attacker can trick the victim into visiting a specially crafted web page, trigger an out-of-bounds read error and gain access to sensitive information.


4) Type Confusion (CVE-ID: CVE-2026-85051)

CWE-ID: CWE-843 - Type confusion

CVSSv4: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a type confusion error within the Compositing component in Google Chrome. A remote attacker can create a specially crafted web page, trick the victim into visiting it, trigger a type confusion error and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.


5) Use-after-free (CVE-ID: CVE-2026-85049)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error within the Skia component in Google Chrome. A remote attacker can create a specially crafted web page, trick the victim into visiting it, trigger use-after-free error and execute arbitrary code on the target system.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.


6) Use-after-free (CVE-ID: CVE-2026-85048)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error within the Compositing component in Google Chrome. A remote attacker can create a specially crafted web page, trick the victim into visiting it, trigger use-after-free error and execute arbitrary code on the target system.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.


7) Race condition (CVE-ID: CVE-2026-85045)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSSv4: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to a race condition in V8 in Google Chrome. A remote attacker can trick the victim to visit a specially crafted webpage and execute arbitrary code on the target system.


8) Incomplete cleanup (CVE-ID: CVE-2026-85043)

CWE-ID: CWE-459 - Incomplete cleanup

CVSSv4: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to cause an unspecified security impact.

The vulnerability exists due to incomplete cleanup in the Network component when handling network operations. A remote attacker can trigger the cleanup flaw through network activity to cause an unspecified security impact.


9) Use-after-free (CVE-ID: CVE-2026-85042)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error within the DevTools component in Google Chrome. A remote attacker can create a specially crafted web page, trick the victim into visiting it, trigger use-after-free error and execute arbitrary code on the target system.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.


10) Race condition (CVE-ID: CVE-2026-85892)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSSv4: 2.1 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to bypass implemented security restrictions.

The vulnerability exists due to a race condition. A remote attacker can elevate privileges from a Low Integrity Level in a contained ("sandboxed") execution environment to a Medium Integrity Level, leading to security restrictions bypass. 


Remediation

Install update from vendor's website.

References