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HighCISA KEVExploited in the wildPublic exploit

Microsoft Publisher Security Feature Bypass Vulnerability

IdentifiersCVE-2023-21715CWE-693

CVE-2023-21715 is a Microsoft Office, specifically Microsoft Publisher, security feature bypass vulnerability. The provided content identifies it as a zero-day that Microsoft described as a "security feature bypass vulnerability" and marked as under active exploitation. It was observed in the wild in campaigns where Storm-0324 used Publisher (.pub, including Ekipa publisher) files to host malicious JavaScript. The available context does not provide technical detail on the exact vulnerable function, parser, or protection mechanism bypassed, so a deeper root-cause description is currently not available.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation allows an attacker to bypass an Office/Publisher security protection that would otherwise impede execution of attacker-supplied content. In the observed campaigns, the bypass was used as part of an initial-access infection chain to facilitate execution of malicious JavaScript, which then dropped malware such as JSSLoader. The practical impact is reduced user-facing protection and increased likelihood of malware execution and follow-on compromise.

Mitigation

If you can’t patch tonight, do this now.

Until patching is complete, reduce exposure by blocking or restricting Microsoft Publisher files from untrusted sources, especially email, Teams, SharePoint, and web downloads. Use Microsoft Defender and Office security controls to inspect and quarantine suspicious attachments, disable or limit execution paths for script-based payloads, enforce attack surface reduction rules, and harden phishing defenses such as Safe Links/ZAP where available. User awareness measures around invoice/payment-themed lures and password-protected attachments can further reduce exploitation likelihood.

Remediation

Patch, then assume compromise.

Apply Microsoft's February 2023 security updates that address CVE-2023-21715 in Microsoft Office/Publisher. Ensure Publisher and related Office components are updated to the latest supported build through Microsoft Update or enterprise patch management. Because the vulnerability was reported as actively exploited, prioritize patch deployment on systems that can open Publisher files received via email, chat, or web downloads.
PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType
Microsoft Corporation365 Appsapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

2 SOURCESView more in app
What this page doesn’t show

The version that knows your environment.

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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence1

Every observed campaign linking this CVE to a named adversary.

Associated malware1

Malware families riding this exploit, with evidence and IOCs.

Detection signatures1

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES
MITRE CVE
cve.org · CVE-2023-21715
NVD
nvd.nist.gov/vuln/detail/CVE-2023-21715
MITRE CWE · CWE-693
cwe.mitre.org
Patch
msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21715
US Government Resource
cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-21715