# Microsoft Dynamics 365 On-Premises Remote Code Execution Vulnerability

CVE record · `CVE-2026-77908`

- **Identifiers:** `CVE-2026-77908`
- **State:** Confirmed
- **Severity:** CVSS 8.8 High
- **Critical:** No
- **CNA:** microsoft
- **Weakness (CWE):** [CWE-94](https://cwe.mitre.org/data/definitions/94.html)
- **Tags:** [Code injection](https://agentprime.io/advisories/tag/code-injection.md)
- **Technologies:** [Microsoft Dynamics 365 Customer Engagement V9.1](https://agentprime.io/advisories/technology/microsoft-dynamics-365-customer-engagement-v9-1.md)
- **Published:** 8 Sept 2026
- **Updated:** 10 Nov 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: microsoft) at 8 Sept 2026, 17:13 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

## Affected products, as the CNA wrote them

- Vendor: Microsoft. Product: Microsoft Dynamics 365 Customer Engagement V9.1.
  - affected: `9.0 to before 9.1.0048.0004` (custom)

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> Microsoft Dynamics 365 Customer Engagement V9.1, versions from 9.0 before 9.1.0048.0004, is affected by a code injection flaw. An attacker with valid authorization and network access can execute code on the affected system. The source gives few details, and no workaround is listed; upgrade to 9.1.0048.0004 or later.

Written 11 Nov 2026.

## Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

## Severity and exploitation

- 8.8 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C`, from CNA (microsoft)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0099, the 62nd percentile, on 12 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 8 Sept 2026, 17:13 UTC: [Confirmed by the CVE List](https://www.cve.org/CVERecord?id=CVE-2026-77908)
- 31 Oct 2026, 16:21 UTC: First seen by agentprime

## Sources

- [CVE List: CVE-2026-77908](https://www.cve.org/CVERecord?id=CVE-2026-77908)
- [NVD: CVE-2026-77908](https://nvd.nist.gov/vuln/detail/CVE-2026-77908)

### References from the CNA

- <https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-77908> (vendor-advisory, patch)

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.

## Check whether this affects you

This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it. Compare the affected versions above with what you run.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), `get_advisory` returns this record and `search_advisories` finds related ones. Setup: <https://agentprime.io/mcp.md>
- As JSON: <https://api.agentprime.io/v1/advisories/CVE-2026-77908>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

---

The web page: <https://agentprime.io/advisories/CVE-2026-77908/>. Everything for agents: <https://agentprime.io/llms.txt>.