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CVE-2026-75110: Memtensor Memos lets anyone create admin API keys

CVE-2026-75110 · published 2 months ago

Summary

When Memtensor Memos is run with authentication turned on but the INTERNAL_SERVICE_SECRET setting is missing, the system mistakenly treats any request as coming from a trusted internal source. This lets an outside attacker use the admin interfaces to create, view, revoke, or replace API keys, giving them ongoing privileged access to the system. Fix the issue by defining a strong INTERNAL_SERVICE_SECRET value (and keep it secret) or apply the latest update that adds proper validation.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software

Vendor	Product	Affected versions
memtensor	memos	<= 2.0.30

Original advisory text

MemOS Authentication Bypass via Unset INTERNAL_SERVICE_SECRET

MemOS is a memory operating system for LLMs and AI agents. In deployments where authentication is enabled (AUTH_ENABLED=true) but the undocumented, defaultless INTERNAL_SERVICE_SECRET environment variable is unset, the is_internal_request() check in src/memos/api/middleware/auth.py fails open: os.getenv("INTERNAL_SERVICE_SECRET") returns None and a request omitting the X-Internal-Service header also yields None, so the comparison None == None evaluates true. The request is then treated as a trusted internal principal and granted scopes: ["all"]. As a result, an unauthenticated remote attacker can reach the admin API-key management endpoints to mint API keys for any user, enumerate keys, revoke keys, and generate a master key for persistent privileged access, as well as all data endpoints.

References

https://www.vulncheck.com/advisories/memos-authentication-bypass-via-unset-inter... Vendor Advisory
https://github.com/MemTensor/MemOS/issues/2259 Third Party Advisory
https://github.com/MemTensor/MemOS Product
https://github.com/MemTensor/MemOS/blob/main/src/memos/api/middleware/auth.py Third Party Advisory
https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/75xxx/CVE-2026-75110... Vendor Advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-75110 Vendor Advisory

Fix within

Internet-facing 3 days

Internal 60 days

Not known to be exploited
Can be exploited automatically
Gives an attacker full control

Severity

9.9 Critical

Exploitation

<1% chance of attack within 30 days

Type

CWE-697Incorrect Comparison

Timeline

Published17 Aug 2026

Updated4 Nov 2026

First seen17 Aug 2026

Sources

CVE-2026-75110 · NVD

CVE-2026-75110 · MITRE

CVE-2026-75110 · OSV

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