CVE-2026-12773

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 1.0%, top 39% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
Elevated
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.0%CVSS: 9.8Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

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
9.8CRITICALmedium confidence
EG Risk
75
EG Risk 75/100

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%
EPSS PROB
1.0%
EPSS %ILE
62nd
KEV
Not listed

Published

June 21, 2026

Last Modified

July 15, 2026

Advisory Details (4)

Auto-updated Oct 3, 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
redhatMentions a patch (unverified)

CVE-2026-12773 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

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.

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFix by version rangeDependents
litellm0.1.0 ... 1.9.dev0 (745 versions)
  • every version up to 1.84.0: fixed in 1.84.0
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 24× 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.

Showing the most recent 100 of 320 total refreshes for this CVE.

  1. 2026-10-09 20:06 UTCEPSS rescore
  2. 2026-10-08 17:11 UTCEPSS rescore
  3. 2026-10-07 23:47 UTCEPSS rescore
  4. 2026-10-06 15:17 UTCEPSS rescore
  5. 2026-10-05 17:42 UTCEPSS rescore
  6. 2026-10-04 23:21 UTCEPSS rescore
  7. 2026-10-03 14:49 UTCOSV refresh
  8. 2026-10-03 14:25 UTCEPSS rescore
  9. 2026-10-01 19:49 UTCEPSS rescore
  10. 2026-09-30 15:02 UTCEPSS rescore
  11. 2026-09-29 15:20 UTCEPSS rescore
  12. 2026-09-28 13:50 UTCEPSS rescore
  13. 2026-09-26 15:58 UTCEPSS rescore
  14. 2026-09-23 13:47 UTCEPSS rescore
  15. 2026-09-20 20:15 UTCEPSS rescore
  16. 2026-09-18 19:27 UTCEPSS rescore
  17. 2026-09-16 05:14 UTCEPSS rescore
  18. 2026-09-14 02:11 UTCEG score recompute
  19. 2026-09-13 16:46 UTCEPSS rescore
  20. 2026-09-13 12:53 UTCEG score recompute
  21. 2026-09-12 15:00 UTCEPSS rescore
  22. 2026-09-11 14:52 UTCEPSS rescore
  23. 2026-09-11 09:36 UTCEPSS rescore
  24. 2026-09-10 09:34 UTCEPSS rescore
  25. 2026-09-08 22:00 UTCEPSS rescore
Show 75 more
  1. 2026-09-07 16:01 UTCEPSS rescore
  2. 2026-09-06 13:47 UTCEPSS rescore
  3. 2026-09-04 05:06 UTCEPSS rescore
  4. 2026-09-02 14:11 UTCEPSS rescore
  5. 2026-09-01 13:53 UTCEPSS rescore
  6. 2026-09-01 04:39 UTCEPSS rescore
  7. 2026-08-31 01:01 UTCGHSA enrichment
  8. 2026-08-30 20:43 UTCEG score recompute
  9. 2026-08-30 20:43 UTCGHSA enrichment
  10. 2026-08-30 19:17 UTCEPSS rescore
  11. 2026-08-30 01:21 UTCEPSS rescore
  12. 2026-08-28 21:40 UTCEPSS rescore
  13. 2026-08-27 14:24 UTCEPSS rescore
  14. 2026-08-25 13:48 UTCEPSS rescore
  15. 2026-08-25 06:55 UTCGHSA enrichment
  16. 2026-08-25 02:37 UTCGHSA enrichment
  17. 2026-08-24 22:16 UTCEG score recompute
  18. 2026-08-24 22:16 UTCGHSA enrichment
  19. 2026-08-24 13:57 UTCEG score recompute
  20. 2026-08-24 13:57 UTCGHSA enrichment
  21. 2026-08-24 06:49 UTCGHSA enrichment
  22. 2026-08-24 01:08 UTCGHSA enrichment
  23. 2026-08-23 20:46 UTCGHSA enrichment
  24. 2026-08-23 16:28 UTCGHSA enrichment
  25. 2026-08-23 12:11 UTCGHSA enrichment
  26. 2026-08-23 07:54 UTCGHSA enrichment
  27. 2026-08-23 03:33 UTCEG score recompute
  28. 2026-08-23 03:33 UTCGHSA enrichment
  29. 2026-08-23 00:19 UTCEPSS rescore
  30. 2026-08-22 22:58 UTCEG score recompute
  31. 2026-08-22 22:58 UTCGHSA enrichment
  32. 2026-08-21 23:48 UTCEPSS rescore
  33. 2026-08-21 23:21 UTCGHSA enrichment
  34. 2026-08-21 18:48 UTCGHSA enrichment
  35. 2026-08-21 14:27 UTCGHSA enrichment
  36. 2026-08-21 10:10 UTCGHSA enrichment
  37. 2026-08-21 05:52 UTCGHSA enrichment
  38. 2026-08-21 01:35 UTCEG score recompute
  39. 2026-08-21 01:35 UTCGHSA enrichment
  40. 2026-08-20 22:55 UTCEPSS rescore
  41. 2026-08-20 21:15 UTCGHSA enrichment
  42. 2026-08-20 16:58 UTCGHSA enrichment
  43. 2026-08-20 12:23 UTCGHSA enrichment
  44. 2026-08-20 07:54 UTCEG score recompute
  45. 2026-08-20 07:54 UTCGHSA enrichment
  46. 2026-08-19 17:03 UTCEPSS rescore
  47. 2026-08-19 15:37 UTCGHSA enrichment
  48. 2026-08-19 11:01 UTCGHSA enrichment
  49. 2026-08-19 05:48 UTCEG score recompute
  50. 2026-08-19 05:48 UTCGHSA enrichment
  51. 2026-08-18 13:48 UTCEPSS rescore
  52. 2026-08-17 13:35 UTCGHSA enrichment
  53. 2026-08-17 09:11 UTCGHSA enrichment
  54. 2026-08-17 04:54 UTCGHSA enrichment
  55. 2026-08-17 00:37 UTCGHSA enrichment
  56. 2026-08-16 20:19 UTCGHSA enrichment
  57. 2026-08-16 15:32 UTCEG score recompute
  58. 2026-08-16 15:32 UTCGHSA enrichment
  59. 2026-08-16 14:56 UTCEPSS rescore
  60. 2026-08-16 11:14 UTCGHSA enrichment
  61. 2026-08-16 06:57 UTCGHSA enrichment
  62. 2026-08-16 02:40 UTCEG score recompute
  63. 2026-08-16 02:40 UTCGHSA enrichment
  64. 2026-08-16 02:14 UTCEPSS rescore
  65. 2026-08-15 22:23 UTCGHSA enrichment
  66. 2026-08-15 18:06 UTCGHSA enrichment
  67. 2026-08-15 13:49 UTCGHSA enrichment
  68. 2026-08-15 09:23 UTCGHSA enrichment
  69. 2026-08-15 05:06 UTCEG score recompute
  70. 2026-08-15 05:06 UTCGHSA enrichment
  71. 2026-08-15 01:30 UTCEPSS rescore
  72. 2026-08-15 00:48 UTCGHSA enrichment
  73. 2026-08-14 20:31 UTCGHSA enrichment
  74. 2026-08-14 16:10 UTCGHSA enrichment
  75. 2026-08-14 11:53 UTCGHSA enrichment

Related CVEs(same product + 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 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 1.0% probability of exploitation in the next 30 days (62nd percentile of EPSS-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?
A fix for CVE-2026-12773 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-12773 are linked in the Vendor Advisories panel on this page.

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