Security readout for executives and security teams
Plain-English summary
A logged-in attacker could abuse Microsoft Dynamics 365 on-premises to place malicious script content that executes when another user views it. Successful exploitation could expose sensitive information and make limited unauthorized changes. A victim must interact with the affected content.
Executive priority
Prioritize verification and patching in the current remediation cycle, especially for externally reachable or sensitive deployments. The high confidentiality impact warrants urgency, but the evidence does not support emergency incident status without local indicators of compromise.
Technical view
CVE-2024-21389 is a CWE-79 cross-site scripting vulnerability with CVSS 3.1 score 7.6. It is remotely reachable, low complexity, requires low privileges and user interaction, and crosses a security boundary. The vector indicates high confidentiality impact, low integrity impact, and no availability impact.
Likely exposure
Organizations operating Microsoft Dynamics 365 on-premises may be exposed. The bundle names version 9.1 but separately lists affected version 9.0, so exact version scope is unclear. Internet accessibility, untrusted user access, and sensitive data handled by the application increase practical risk.
Exploitation context
The provided sources do not establish active exploitation, and the CVE is not listed as KEV in the bundle. Exploitation requires an authenticated, low-privileged attacker and a separate user to interact with affected content. No exploit method or observed campaign is documented here.
Researcher notes
The supplied affected-product data is internally inconsistent: it labels the product as version 9.1 while listing version 9.0. Confirm scope directly with Microsoft. CVSS temporal metrics indicate unproven exploitation and an official remedy, but the bundle provides no fixed build, exploitation telemetry, or detailed attack path.
Mitigation direction
- Review the Microsoft advisory to confirm affected builds and obtain the applicable security update.
- Apply Microsoft's security update using the organization's tested patch-management process.
- Restrict untrusted user access until affected systems are updated.
- Reduce unnecessary internet exposure and enforce least privilege for Dynamics accounts.
Validation and detection
- Inventory all Dynamics 365 on-premises deployments, versions, builds, and external exposure.
- Compare installed builds with the affected and fixed versions in Microsoft's advisory.
- Confirm the security update installed successfully on every applicable server.
- Review application and identity logs for suspicious authenticated activity or unexpected scripted content.
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-79: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. 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 lookupCVE-2024-21389 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
- High
- CVSS
- 7.6 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N/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:L/UI:R/S:C/C:H/I:L/A:N/E:U/RL:O/RC:C2.34.7microsoftVulnerability scoring details
Base CVSS 3.1 score
7.6HighVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N/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
- Microsoft Dynamics 365 (on-premises) Cross-site Scripting 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.
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.