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PatchSiren cyber security CVE debrief

CVE-2012-1854 Microsoft CVE debrief

CVE-2012-1854 is a Microsoft Visual Basic for Applications (VBA) insecure library loading vulnerability that CISA has added to its Known Exploited Vulnerabilities catalog. That KEV listing means defenders should treat it as actively exploited or of confirmed exploitation concern and prioritize mitigation. The supplied source does not include a CVSS score or detailed exploit mechanics, so response planning should be driven by the KEV status and Microsoft’s published guidance.

Vendor
Microsoft
Product
Visual Basic for Applications (VBA)
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2026-04-13
Original CVE updated
2026-04-13
Advisory published
2026-04-13
Advisory updated
2026-04-13

Who should care

Organizations that use Microsoft products with VBA support, especially endpoint, desktop engineering, application security, and vulnerability management teams responsible for Office-enabled environments.

Technical summary

The official source corpus identifies the issue as an insecure library loading vulnerability in Microsoft Visual Basic for Applications (VBA). CISA’s KEV record marks it as known exploited, with a required action to apply vendor mitigations, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. The source corpus does not provide a CVSS score or further technical detail.

Defensive priority

High

Recommended defensive actions

  • Inventory systems and applications that rely on Microsoft VBA support and confirm exposure to the affected software path.
  • Review and apply Microsoft’s guidance referenced by CISA, including Security Bulletin MS12-046 and any associated mitigations.
  • If mitigations are unavailable for your environment, discontinue use of the affected product or feature per CISA guidance.
  • Prioritize remediation before the CISA KEV due date of 2026-04-27 where operationally possible.
  • Validate that vulnerability management and endpoint protection workflows track this CVE as a known exploited issue rather than a score-only finding.

Evidence notes

Evidence is limited to the supplied source corpus and official records. CISA’s KEV entry names the vulnerability, lists Microsoft as vendor and Visual Basic for Applications (VBA) as the product, and records dateAdded as 2026-04-13 with dueDate 2026-04-27. The CISA metadata also notes unknown ransomware campaign use and references Microsoft Security Bulletin MS12-046 and the NVD record. No CVSS score is provided in the corpus.

Sources and references

Verified primary and authoritative sources

  • CVE-2012-1854 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2012-1854

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2012-1854 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2012-1854

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

  • CISA Known Exploited Vulnerabilities catalog

    Publisher, destination, and source semantics verified

    URL: https://www.cisa.gov/known-exploited-vulnerabilities-catalog

    Cybersecurity and Infrastructure Security Agency - Official CISA catalog of vulnerabilities known to be exploited in the wild.

Supplemental references

  • Source item URL

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

    cisa_kev

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.