Security readout for executives and security teams
Plain-English summary
This is a critical remote code execution issue in Microsoft Nuance PowerScribe. An unauthenticated attacker could execute code over the network if a vulnerable PowerScribe instance is exposed. Healthcare and radiology environments using the listed versions should treat this as urgent because compromise could affect confidentiality, integrity, and availability of clinical systems.
Executive priority
Treat as an urgent healthcare application risk. The issue allows unauthenticated network code execution with critical impact, but public evidence supplied here does not confirm active exploitation.
Technical view
CVE-2026-26142 is a CWE-502 deserialization of untrusted data flaw in Nuance PowerScribe. The supplied CVSS 3.1 vector is 9.8: network-accessible, low complexity, no privileges, no user interaction, unchanged scope, with high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is limited to organizations running the listed Nuance PowerScribe 360 4.0 through 4.0.9 or PowerScribe One 2019.1 through 2019.10 versions. Risk is highest where vulnerable services are reachable across internal or external networks.
Exploitation context
The source bundle does not show CISA KEV listing or cited active exploitation. The CVSS vector indicates unauthenticated network exploitation is theoretically straightforward, but the temporal metric lists exploit maturity as unproven.
Researcher notes
The provided evidence identifies affected versions, CWE, CVSS, and vendor advisory, but not a specific protocol, endpoint, or vulnerable component. Avoid exploit assumptions; focus on version validation, patch verification, and vendor-published remediation details.
Mitigation direction
- Review Microsoft MSRC guidance for the official update or remediation path.
- Patch affected PowerScribe systems according to vendor instructions.
- Prioritize internet-reachable or broadly network-reachable deployments first.
- If patching is delayed, seek vendor-approved compensating controls.
- Confirm backup and recovery readiness before production changes.
Validation and detection
- Inventory all Nuance PowerScribe deployments and exact versions.
- Compare versions against the affected product list in the advisory.
- Verify MSRC remediation status and any superseding vendor guidance.
- Confirm patched systems no longer report affected versions.
- Review security monitoring for suspicious access around PowerScribe services.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-502: Code execution behavior lookup
Code execution and unsafe deserialization weaknesses often justify reviewing execution behavior and process telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-26142 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C3.95.9microsoftVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- Nuance PowerScribe Remote Code Execution VulnerabilityCVE reference, microsoft · vendor-advisory, patch
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Deserialization of Untrusted Data
Deserialization of Untrusted Data represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.