CVE-2026-33010 json
mcp-memory-service's Wildcard CORS with Credentials Enables Cross-Origin Memory Theft
published 2026-03-07 8 mo ago modified 2026-07-13 3 mo ago also GHSA-g9rg-8vq5-mpwm , PYSEC-2026-2625 , EUVD-2026-13766
- cvss
- 8.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 34%
- public exploits
- 0
- none known
Summary
mcp-memory-service is an open-source memory backend for multi-agent systems. Prior to version 10.25.1, when the HTTP server is enabled (MCP_HTTP_ENABLED=true), the application configures FastAPI's CORSMiddleware with allow_origins=['*'], allow_credentials=True, allow_methods=["*"], and allow_headers=["*"]. The wildcard Access-Control-Allow-Origin: * header permits any website to read API responses cross-origin. When combined with anonymous access (MCP_ALLOW_ANONYMOUS_ACCESS=true) - the simplest way to get the HTTP dashboard working without OAuth - no credentials are needed, so any malicious website can silently read, modify, and delete all stored memories. This issue has been patched in version 10.25.1.
Patch / fix
- pypi mcp-memory-service 10.25.1
- doobidoo mcp-memory-service 10.25.1
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- total
- Assessed
- 7 mo ago
Exploit prediction
0.40% chance of exploitation in the next 30 days, higher than 34% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/doobidoo/mcp-memory-service/security/advisories/GHSA-g9rg-8vq5-mpwm referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N |
| NVD | 3.1 | 8.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| GitHub | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N |
| OSV | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | mcp-memory-service | <10.25.1 |
10.25.1 |
Affected products
- doobidoo mcp-memory-service
Classification
- Weakness
-
- CWE-942 Permissive Cross-domain Security Policy with Untrusted Domains
References
-
github.com
/doobidoo/mcp-memory-service/security/advisories/GHSA-g9rg-8vq5-mpwm
exploit, web, vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-33010
advisory
-
github.com
/doobidoo/mcp-memory-service
package
-
pypi.org
/project/mcp-memory-service
package
-
github.com
/advisories/GHSA-g9rg-8vq5-mpwm
advisory
Sources
- CVE List CVE-2026-33010
- GitHub Advisory GHSA-g9rg-8vq5-mpwm
- NVD CVE-2026-33010
- OSV PYSEC-2026-2625
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.