CVE-2026-12773

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 0.6%, top 54% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
Trending — 3 sources updated this weekElevated
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: Elevated riskExposed: 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
9.8(medium)
EG Risk
75(Attend)
EG Risk 75/100SSVC: Attend

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
Severity98% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
1%
EPSS %ILE
46%
KEV
Not listed

Published

June 21, 2026

Last Modified

July 15, 2026

Advisory Details (4)

Auto-updated Jul 25, 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 14× in last 7d / 78× 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. 2026-07-27 06:39 UTCGHSA enrichment
  2. 2026-07-27 01:13 UTCGHSA enrichment
  3. 2026-07-26 20:42 UTCGHSA enrichment
  4. 2026-07-26 16:21 UTCEG score recompute
  5. 2026-07-26 16:21 UTCGHSA enrichment
  6. 2026-07-26 14:54 UTCEPSS rescore
  7. 2026-07-26 14:54 UTCEPSS rescore
  8. 2026-07-25 14:17 UTCEPSS rescore
  9. 2026-07-24 14:17 UTCEPSS rescore
  10. 2026-07-23 14:18 UTCEPSS rescore
  11. 2026-07-23 03:05 UTCEG score recompute▲ 2.50
  12. 2026-07-22 14:08 UTCEPSS rescore
  13. 2026-07-21 15:24 UTCEPSS rescore
  14. 2026-07-20 17:08 UTCEPSS rescore
  15. 2026-07-19 14:30 UTCEPSS rescore
  16. 2026-07-19 02:28 UTCEPSS rescore
  17. 2026-07-18 10:04 UTCEPSS rescore
  18. 2026-07-17 00:41 UTCGHSA enrichment
  19. 2026-07-16 17:02 UTCEPSS rescore
  20. 2026-07-16 11:26 UTCGHSA enrichment
  21. 2026-07-15 22:25 UTCGHSA enrichment
  22. 2026-07-15 16:57 UTCEPSS rescore
  23. 2026-07-15 09:23 UTCGHSA enrichment
  24. 2026-07-15 02:26 UTCNVD updateCVSS v3 → 9.8 · CVSS v4 → 5.5 · severity → CRITICAL
  25. 2026-07-15 02:06 UTCMITRE cvelistV5CVSS v3 → 7.3 · CVSS v4 → 6.9 · severity → HIGH
Show 73 more
  1. 2026-07-15 02:00 UTCEPSS rescore
  2. 2026-07-14 20:16 UTCGHSA enrichment
  3. 2026-07-14 07:14 UTCGHSA enrichment
  4. 2026-07-13 22:30 UTCEPSS rescore
  5. 2026-07-13 18:13 UTCGHSA enrichment
  6. 2026-07-13 06:12 UTCEPSS rescore
  7. 2026-07-13 05:00 UTCGHSA enrichment
  8. 2026-07-12 15:58 UTCGHSA enrichment
  9. 2026-07-12 05:46 UTCEPSS rescore
  10. 2026-07-12 02:57 UTCGHSA enrichment
  11. 2026-07-11 13:56 UTCGHSA enrichment
  12. 2026-07-11 08:27 UTCEPSS rescore
  13. 2026-07-11 00:54 UTCGHSA enrichment
  14. 2026-07-10 11:52 UTCGHSA enrichment
  15. 2026-07-09 22:36 UTCGHSA enrichment
  16. 2026-07-09 19:10 UTCEPSS rescore
  17. 2026-07-09 09:34 UTCGHSA enrichment
  18. 2026-07-08 20:33 UTCGHSA enrichment
  19. 2026-07-08 15:15 UTCEPSS rescore
  20. 2026-07-08 15:15 UTCEPSS rescore
  21. 2026-07-08 07:31 UTCGHSA enrichment
  22. 2026-07-07 18:29 UTCGHSA enrichment
  23. 2026-07-07 13:46 UTCEPSS rescore
  24. 2026-07-07 01:16 UTCGHSA enrichment
  25. 2026-07-06 16:27 UTCEPSS rescore
  26. 2026-07-06 12:15 UTCGHSA enrichment
  27. 2026-07-06 02:23 UTCEPSS rescore
  28. 2026-07-05 23:02 UTCGHSA enrichment
  29. 2026-07-05 09:58 UTCGHSA enrichment
  30. 2026-07-05 02:30 UTCEPSS rescore
  31. 2026-07-05 02:30 UTCEPSS rescore
  32. 2026-07-04 20:56 UTCGHSA enrichment
  33. 2026-07-04 07:55 UTCGHSA enrichment
  34. 2026-07-04 06:31 UTCEPSS rescore
  35. 2026-07-03 18:54 UTCGHSA enrichment
  36. 2026-07-03 05:53 UTCGHSA enrichment
  37. 2026-07-02 16:51 UTCGHSA enrichment
  38. 2026-07-02 03:49 UTCGHSA enrichment
  39. 2026-07-01 15:06 UTCEPSS rescore
  40. 2026-07-01 15:06 UTCEPSS rescore
  41. 2026-07-01 14:47 UTCGHSA enrichment
  42. 2026-07-01 01:45 UTCGHSA enrichment
  43. 2026-06-30 23:22 UTCEPSS rescore
  44. 2026-06-30 12:43 UTCGHSA enrichment
  45. 2026-06-29 23:36 UTCGHSA enrichment
  46. 2026-06-29 14:06 UTCEPSS rescore
  47. 2026-06-29 10:35 UTCGHSA enrichment
  48. 2026-06-28 21:33 UTCGHSA enrichment
  49. 2026-06-28 14:07 UTCEPSS rescore
  50. 2026-06-28 08:32 UTCGHSA enrichment
  51. 2026-06-28 04:56 UTCEPSS rescore
  52. 2026-06-28 04:56 UTCEPSS rescore
  53. 2026-06-27 19:30 UTCGHSA enrichment
  54. 2026-06-27 06:29 UTCGHSA enrichment
  55. 2026-06-27 03:08 UTCEPSS rescore
  56. 2026-06-26 17:27 UTCGHSA enrichment
  57. 2026-06-26 04:26 UTCGHSA enrichment
  58. 2026-06-25 15:22 UTCGHSA enrichment
  59. 2026-06-25 13:49 UTCEPSS rescore
  60. 2026-06-25 02:20 UTCGHSA enrichment
  61. 2026-06-24 22:03 UTCNVD updateCVSS v3 → 9.8 · severity → CRITICAL
  62. 2026-06-24 14:05 UTCEPSS rescore
  63. 2026-06-24 13:18 UTCGHSA enrichment
  64. 2026-06-24 00:17 UTCGHSA enrichment
  65. 2026-06-23 21:32 UTCEPSS rescore
  66. 2026-06-23 11:13 UTCGHSA enrichment
  67. 2026-06-22 22:10 UTCGHSA enrichment
  68. 2026-06-22 17:45 UTCNVD updateCVSS v4 → 5.5 · severity → HIGH
  69. 2026-06-22 09:08 UTCGHSA enrichment
  70. 2026-06-21 20:06 UTCGHSA enrichment
  71. 2026-06-21 07:02 UTCEG score recompute
  72. 2026-06-21 07:02 UTCGHSA enrichment
  73. 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 July 15, 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 1% probability of exploitation in the next 30 days, which ranks it in the top 54.3% of all scored CVEs.
What is the CVSS score of CVE-2026-12773?
CVE-2026-12773 has a CVSS v3 base score of 9.8 (NVD).
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.

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