Security feed

24 October 2026

advisoryCISA Known Exploited Vulnerabilities24 Oct 2026

Microsoft Office Buffer Overflow Vulnerability

Microsoft Office contains a buffer overflow vulnerability that allows remote attackers to execute code via a Word document with a crafted tag containing an invalid length field. CISA required action: Apply updates per vendor instructions.

Office CVE-2009-0563

Structured advisory · Revision 1Original source

Evidence and details

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: kev:CVE-2009-0563

Office

Source reference: /product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Related CVEs: CVE-2009-0563
Source reference: /cveID

Publisher severity

No explicit severity was provided.

Event: #2513 · Revision 1
Added to Heist Feed: Sat, 24 Oct 2026 21:19:53 GMT
Publisher date: Wed, 08 Jun 2022 00:00:00 GMT

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advisoryCISA Known Exploited Vulnerabilities24 Oct 2026

Microsoft Office Buffer Overflow Vulnerability

Microsoft Office contains a buffer overflow vulnerability that allows remote attackers to execute code via crafted PNG data in an Office document. CISA required action: Apply updates per vendor instructions.

Office CVE-2013-1331

Structured advisory · Revision 1Original source

Evidence and details

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: kev:CVE-2013-1331

Office

Source reference: /product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Related CVEs: CVE-2013-1331
Source reference: /cveID

Publisher severity

No explicit severity was provided.

Event: #1498 · Revision 1
Added to Heist Feed: Sat, 24 Oct 2026 21:03:12 GMT
Publisher date: Wed, 08 Jun 2022 00:00:00 GMT

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advisoryCISA Known Exploited Vulnerabilities24 Oct 2026

Microsoft Office Publisher Security Feature Bypass Vulnerability

Microsoft Office Publisher contains a security feature bypass vulnerability that allows for a local, authenticated attack on a targeted system. CISA required action: Apply updates per vendor instructions.

Office CVE-2023-21715

Structured advisory · Revision 1Original source

Evidence and details

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: kev:CVE-2023-21715

Office

Source reference: /product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Related CVEs: CVE-2023-21715
Source reference: /cveID

Publisher severity

No explicit severity was provided.

Event: #1375 · Revision 1
Added to Heist Feed: Sat, 24 Oct 2026 21:01:49 GMT
Publisher date: Tue, 14 Feb 2023 00:00:00 GMT

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advisoryCISA Known Exploited Vulnerabilities24 Oct 2026

Microsoft Office Outlook Privilege Escalation Vulnerability

Microsoft Office Outlook contains a privilege escalation vulnerability that allows for a NTLM Relay attack against another service to authenticate as the user. CISA required action: Apply updates per vendor instructions.

Office CVE-2023-23397

Structured advisory · Revision 1Original source

Evidence and details

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: kev:CVE-2023-23397

Office

Source reference: /product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Related CVEs: CVE-2023-23397
Source reference: /cveID

Publisher severity

No explicit severity was provided.

Event: #1363 · Revision 1
Added to Heist Feed: Sat, 24 Oct 2026 21:01:41 GMT
Publisher date: Tue, 14 Mar 2023 00:00:00 GMT

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advisoryCISA Known Exploited Vulnerabilities24 Oct 2026

Microsoft Office Excel Remote Code Execution Vulnerability

Microsoft Office Excel contains a remote code execution vulnerability that can be exploited when a specially crafted Excel file is opened. This malicious file could be delivered as an email attachment or hosted on a malicious website. An attacker could leverage this vulnerability by creating a specially crafted Excel file, which, when opened, allowing an attacker to execute remote code on the affected system. CISA required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Office CVE-2007-0671

Structured advisory · Revision 1Original source

Evidence and details

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: kev:CVE-2007-0671

Office

Source reference: /product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Related CVEs: CVE-2007-0671
Source reference: /cveID

Publisher severity

No explicit severity was provided.

Event: #361 · Revision 1
Added to Heist Feed: Sat, 24 Oct 2026 20:44:40 GMT
Publisher date: Tue, 12 Aug 2025 00:00:00 GMT

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advisoryCISA Known Exploited Vulnerabilities24 Oct 2026

Microsoft Office PowerPoint Code Injection Vulnerability

Microsoft Office PowerPoint contains a code injection vulnerability that allows remote attackers to execute arbitrary code via a PowerPoint file with an OutlineTextRefAtom containing an invalid index value that triggers memory corruption. CISA required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Office CVE-2009-0556

Structured advisory · Revision 1Original source

Evidence and details

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: kev:CVE-2009-0556

Office

Source reference: /product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Related CVEs: CVE-2009-0556
Source reference: /cveID

Publisher severity

No explicit severity was provided.

Event: #271 · Revision 1
Added to Heist Feed: Sat, 24 Oct 2026 20:42:56 GMT
Publisher date: Wed, 07 Jan 2026 00:00:00 GMT

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advisoryCISA Known Exploited Vulnerabilities24 Oct 2026

Microsoft Office Security Feature Bypass Vulnerability

Microsoft Office contains a security feature bypass vulnerability in which reliance on untrusted inputs in a security decision in Microsoft Office could allow an unauthorized attacker to bypass a security feature locally. Some of the impacted product(s) could be end-of-life (EoL) and/or end-of-service (EoS). Users are advised to discontinue use and/or transition to a supported version. CISA required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Office CVE-2026-21509

Structured advisory · Revision 1Original source

Evidence and details

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: kev:CVE-2026-21509

Office

Source reference: /product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Related CVEs: CVE-2026-21509
Source reference: /cveID

Publisher severity

No explicit severity was provided.

Event: #261 · Revision 1
Added to Heist Feed: Sat, 24 Oct 2026 20:42:50 GMT
Publisher date: Mon, 26 Jan 2026 00:00:00 GMT

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advisoryCISA Known Exploited Vulnerabilities24 Oct 2026

Microsoft Office Word Reliance on Untrusted Inputs in a Security Decision Vulnerability

Microsoft Office Word contains a reliance on untrusted inputs in a security decision vulnerability that could allow an authorized attacker to elevate privileges locally. CISA required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Office CVE-2026-21514

Structured advisory · Revision 1Original source

Evidence and details

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: kev:CVE-2026-21514

Office

Source reference: /product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Related CVEs: CVE-2026-21514
Source reference: /cveID

Publisher severity

No explicit severity was provided.

Event: #249 · Revision 1
Added to Heist Feed: Sat, 24 Oct 2026 20:42:43 GMT
Publisher date: Tue, 10 Feb 2026 00:00:00 GMT

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advisoryCISA Known Exploited Vulnerabilities24 Oct 2026

Microsoft Office Remote Code Execution

Microsoft Office Excel contains a remote code execution vulnerability that could allow an attacker to take complete control of an affected system if a user opens a specially crafted Excel file that includes a malformed object. CISA required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Office CVE-2009-0238

Structured advisory · Revision 1Original source

Evidence and details

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: kev:CVE-2009-0238

Office

Source reference: /product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Related CVEs: CVE-2009-0238
Source reference: /cveID

Publisher severity

No explicit severity was provided.

Event: #188 · Revision 1
Added to Heist Feed: Sat, 24 Oct 2026 20:42:06 GMT
Publisher date: Tue, 14 Apr 2026 00:00:00 GMT

Read the original announcement