Dashboard / CVE-2026-123271

CVE-2026-123271

MEDIUM
MEDIUM Priority: 0.01 BB Relevance: 60/100
Published: 2026-11-05 Modified: 2026-11-12 First seen: 2026-11-05 Status: active

Attack Surface

Network Low Complexity No Auth

CVSS Vector Breakdown

AV: Network
AC: Low
PR: None
UI: Active
S: X
AT: Present
VC: None
VI: None
VA: None

Description

ChatCLI before v1.215.2 contains an improper validation vulnerability in the MCP OAuth login flow that uses server-supplied Protected Resource Metadata as the resource indicator without checking it matches the configured server URL. A malicious MCP server can declare another resource on the same authorization server, obtain the user's bearer token for it, and replay that token against the other resource.

Weakness Classification (1)

Affected Software (3)

VendorProductVersion
diillson ChatCLI v1.159.0 < v1.215.2
diillson ChatCLI v1.159.0 < v1.215.2
diillson ChatCLI v1.159.0 < v1.215.2

References & Advisories (5)

Bug Bounty Relevance

60 / 100
✓ Network accessible
✓ No authentication
✓ Low complexity

CVSS Score

5.1 / 10.0 v4.0
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS — Exploitation Probability

0.15%
Raw Score 0.001460
Percentile 3.9%
Date 2026-11-13

EPSS Trend

2026-11-13
0.00146
2026-11-12
0.00146
2026-11-10
0.00146
2026-11-09
0.00146
2026-11-08
0.00146
2026-11-07
0.00146
2026-11-06
0.00146

Intelligence Sources

mitre ref →
nvd ref →

External Links