CVE-2026-12773

CRITICALNVD 9.87.3▼
EchelonGraph scoreMEDIUM confidence

Score 7.3 from GitHub Security Advisory published 2026-06-21. NVD baseline CVSS 9.8; sources differ by 2.5.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.8Exploit: NoneExposed: 0

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

A weakness has been identified in BerriAI litellm up to 1.59.8. Affected is the function UserAPIKeyAuth of the file litellm/proxy/_experimental/mcp_server/auth/user_api_key_auth_mcp.py of the component MCP Proxy. Executing a manipulation can lead to improper authentication. The attack may be launched remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure.

CVSS v3
9.8
EG Score
7.3(medium)
EPSS
45.0%
KEV
Not listed

Published

June 21, 2026

Last Modified

June 30, 2026

Advisory Details (4)

Auto-updated Jun 30, 2026
Patch available. Sources: redhat.
redhat
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-12773.json
redhat

2491112 – (CVE-2026-12773) CVE-2026-12773 litellm: BerriAI litellm: Improper authentication in MCP Proxy via UserAPIKeyAuth function

https://bugzilla.redhat.com/show_bug.cgi?id=2491112
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-12773
generic

Critical Authentication Bypass and Privilege Escalation via Exception Swallowing in MCP Proxy · GitHub

https://gist.github.com/YLChen-007/3cfaad10a69d7a15e4d4d458cb53309e

Vendor Advisories for CVE-2026-12773(1)

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

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 34× in last 7d / 79× 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. 2026-07-07 01:16 UTCEG score recompute
  2. 2026-07-07 01:16 UTCGHSA enrichment
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 12:15 UTCEG score recompute
  5. 2026-07-06 12:15 UTCGHSA enrichment
  6. 2026-07-06 02:23 UTCEPSS rescore
  7. 2026-07-05 23:02 UTCEG score recompute
  8. 2026-07-05 23:02 UTCGHSA enrichment
  9. 2026-07-05 09:58 UTCEG score recompute
  10. 2026-07-05 09:58 UTCGHSA enrichment
  11. 2026-07-05 02:30 UTCEPSS rescore
  12. 2026-07-05 02:30 UTCEPSS rescore
  13. 2026-07-04 20:56 UTCEG score recompute
  14. 2026-07-04 20:56 UTCGHSA enrichment
  15. 2026-07-04 07:55 UTCEG score recompute
  16. 2026-07-04 07:55 UTCGHSA enrichment
  17. 2026-07-04 06:31 UTCEPSS rescore
  18. 2026-07-03 18:54 UTCEG score recompute
  19. 2026-07-03 18:54 UTCGHSA enrichment
  20. 2026-07-03 05:53 UTCEG score recompute
  21. 2026-07-03 05:53 UTCGHSA enrichment
  22. 2026-07-02 16:51 UTCEG score recompute
  23. 2026-07-02 16:51 UTCGHSA enrichment
  24. 2026-07-02 03:49 UTCEG score recompute
  25. 2026-07-02 03:49 UTCGHSA enrichment
Show 54 more
  1. 2026-07-01 15:06 UTCEPSS rescore
  2. 2026-07-01 15:06 UTCEPSS rescore
  3. 2026-07-01 14:47 UTCEG score recompute
  4. 2026-07-01 14:47 UTCGHSA enrichment
  5. 2026-07-01 01:45 UTCEG score recompute
  6. 2026-07-01 01:45 UTCGHSA enrichment
  7. 2026-06-30 23:22 UTCEPSS rescore
  8. 2026-06-30 12:43 UTCEG score recompute
  9. 2026-06-30 12:43 UTCGHSA enrichment
  10. 2026-06-29 23:36 UTCEG score recompute
  11. 2026-06-29 23:36 UTCGHSA enrichment
  12. 2026-06-29 14:06 UTCEPSS rescore
  13. 2026-06-29 10:35 UTCEG score recompute
  14. 2026-06-29 10:35 UTCGHSA enrichment
  15. 2026-06-28 21:34 UTCEG score recompute
  16. 2026-06-28 21:33 UTCGHSA enrichment
  17. 2026-06-28 14:07 UTCEPSS rescore
  18. 2026-06-28 08:32 UTCEG score recompute
  19. 2026-06-28 08:32 UTCGHSA enrichment
  20. 2026-06-28 04:56 UTCEPSS rescore
  21. 2026-06-28 04:56 UTCEPSS rescore
  22. 2026-06-27 19:30 UTCEG score recompute
  23. 2026-06-27 19:30 UTCGHSA enrichment
  24. 2026-06-27 06:29 UTCEG score recompute
  25. 2026-06-27 06:29 UTCGHSA enrichment
  26. 2026-06-27 03:08 UTCEPSS rescore
  27. 2026-06-26 17:27 UTCEG score recompute
  28. 2026-06-26 17:27 UTCGHSA enrichment
  29. 2026-06-26 04:26 UTCEG score recompute
  30. 2026-06-26 04:26 UTCGHSA enrichment
  31. 2026-06-25 15:23 UTCEG score recompute
  32. 2026-06-25 15:22 UTCGHSA enrichment
  33. 2026-06-25 13:49 UTCEPSS rescore
  34. 2026-06-25 02:21 UTCEG score recompute
  35. 2026-06-25 02:20 UTCGHSA enrichment
  36. 2026-06-24 22:03 UTCNVD updateCVSS v3 → 9.8 · severity → CRITICAL
  37. 2026-06-24 14:05 UTCEPSS rescore
  38. 2026-06-24 13:19 UTCEG score recompute
  39. 2026-06-24 13:18 UTCGHSA enrichment
  40. 2026-06-24 00:17 UTCEG score recompute
  41. 2026-06-24 00:17 UTCGHSA enrichment
  42. 2026-06-23 21:32 UTCEPSS rescore
  43. 2026-06-23 11:13 UTCEG score recompute
  44. 2026-06-23 11:13 UTCGHSA enrichment
  45. 2026-06-22 22:10 UTCEG score recompute
  46. 2026-06-22 22:10 UTCGHSA enrichment
  47. 2026-06-22 17:45 UTCNVD updateCVSS v4 → 5.5 · severity → HIGH
  48. 2026-06-22 09:09 UTCEG score recompute
  49. 2026-06-22 09:08 UTCGHSA enrichment
  50. 2026-06-21 20:06 UTCEG score recompute
  51. 2026-06-21 20:06 UTCGHSA enrichment
  52. 2026-06-21 07:02 UTCEG score recompute
  53. 2026-06-21 07:02 UTCGHSA enrichment
  54. 2026-06-21 07:01 UTCGHSA enrichment

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-12773?
CVE-2026-12773 is a critical vulnerability published on June 21, 2026. A weakness has been identified in BerriAI litellm up to 1.59.8. Affected is the function UserAPIKeyAuth of the file litellm/proxy/experimental/mcpserver/auth/userapikeyauthmcp.py of the component MCP Proxy. Executing a manipulation can lead to improper authentication. The attack may be launched…
When was CVE-2026-12773 disclosed?
CVE-2026-12773 was first published in the National Vulnerability Database on June 21, 2026, with the most recent update on June 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-12773 actively exploited?
CVE-2026-12773 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 45.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-12773?
CVE-2026-12773 has a CVSS v3 base score of 9.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 7.3.
How do I remediate CVE-2026-12773?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-12773, 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

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