CVE-2026-48039

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 73% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.1Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Meta Ads MCP is a Model Context Protocol (MCP) server that lets AI assistants run Meta Ads. Prior to version 1.0.109, AuthInjectionMiddleware.dispatch() at http_auth_integration.py:272 unconditionally forwards unauthenticated Streamable HTTP requests to downstream MCP tool handlers without issuing a 401 response, allowing any network-reachable caller to invoke MCP tools without authentication. When no per-request credential is present, tool handlers fall back to the META_ACCESS_TOKEN environment variable, and when the downstream Meta Graph API call fails, api.py:263–269 serialises the raw httpx request URL—including the operator's access_token as a query parameter—into the JSON-RPC response body, delivering the credential to the unauthenticated caller. Version 1.0.109 fixes the issue.

CVSS v3
9.1
EG Score
9.1(medium)
EG Risk
46(Track)
EG Risk 46/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity91% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
27%
KEV
Not listed

Published

June 11, 2026

Last Modified

August 7, 2026

Advisory Details (3)

Auto-updated Aug 7, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_release.
generic🟡 PoC Available

advisory-database/vulns/meta-ads-mcp/PYSEC-2026-413.yaml at main · pypa/advisory-database · GitHub

https://github.com/pypa/advisory-database/tree/main/vulns/meta-ads-mcp/PYSEC-2026-413.yaml
github_release Patch Available

1.0.109

Patch available: pipeboard-co/meta-ads-mcp 1.0.109

https://github.com/pipeboard-co/meta-ads-mcp/releases/tag/1.0.109
github Patch Available🟡 PoC Available

Unauthenticated HTTP MCP Tool Execution Leaks Operator Meta Access Token · Advisory · pipeboard-co/meta-ads-mcp · GitHub

https://github.com/pipeboard-co/meta-ads-mcp/security/advisories/GHSA-9gw6-46qc-99vr

Vendor Advisories for CVE-2026-48039(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
meta-ads-mcp0.1.0 ... 1.0.99 (167 versions)1.0.109—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 10× in last 7d / 32× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-25 13:49 UTCEPSS rescore
  2. 2026-08-25 00:04 UTCEG score recompute
  3. 2026-08-23 10:43 UTCEG score recompute
  4. 2026-08-23 00:19 UTCEPSS rescore
  5. 2026-08-21 23:49 UTCEPSS rescore
  6. 2026-08-21 01:29 UTCEG score recompute
  7. 2026-08-20 22:55 UTCEPSS rescore
  8. 2026-08-20 08:51 UTCEG score recompute
  9. 2026-08-19 17:04 UTCEPSS rescore
  10. 2026-08-19 14:54 UTCEG score recompute
  11. 2026-08-18 13:48 UTCEPSS rescore
  12. 2026-08-17 15:34 UTCEG score recompute
  13. 2026-08-17 13:47 UTCEPSS rescore
  14. 2026-08-16 16:20 UTCEG score recompute
  15. 2026-08-16 14:56 UTCEPSS rescore
  16. 2026-08-16 03:57 UTCEG score recompute
  17. 2026-08-16 02:14 UTCEPSS rescore
  18. 2026-08-15 03:02 UTCEG score recompute
  19. 2026-08-15 01:30 UTCEPSS rescore
  20. 2026-08-13 22:14 UTCEG score recompute
  21. 2026-08-13 22:00 UTCEPSS rescore
  22. 2026-08-12 17:42 UTCEG score recompute
  23. 2026-08-12 13:51 UTCEPSS rescore
  24. 2026-08-11 16:40 UTCEG score recompute
  25. 2026-08-11 00:03 UTCEG score recompute
Show 13 more
  1. 2026-08-11 00:00 UTCEPSS rescore
  2. 2026-08-09 17:47 UTCEG score recompute
  3. 2026-08-09 13:46 UTCEPSS rescore
  4. 2026-08-08 17:06 UTCEG score recompute
  5. 2026-08-08 16:37 UTCEPSS rescore
  6. 2026-08-07 20:30 UTCEG score recompute
  7. 2026-07-30 09:41 UTCEG score recompute
  8. 2026-07-26 20:54 UTCEG score recompute
  9. 2026-07-23 03:18 UTCEG score recompute
  10. 2026-06-14 23:18 UTCEPSS rescore
  11. 2026-06-13 23:00 UTCEPSS rescore
  12. 2026-06-12 23:12 UTCEPSS rescore
  13. 2026-06-11 13:56 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-48039?
CVE-2026-48039 is a critical vulnerability published on June 11, 2026. Meta Ads MCP is a Model Context Protocol (MCP) server that lets AI assistants run Meta Ads. Prior to version 1.0.109, AuthInjectionMiddleware.dispatch() at httpauthintegration.py:272 unconditionally forwards unauthenticated Streamable HTTP requests to downstream MCP tool handlers without issuing a…
When was CVE-2026-48039 disclosed?
CVE-2026-48039 was first published in the National Vulnerability Database on June 11, 2026, with the most recent update on August 7, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-48039 actively exploited?
CVE-2026-48039 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 73.0% of all scored CVEs.
What is the CVSS score of CVE-2026-48039?
CVE-2026-48039 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-48039?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-48039, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-48039

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