Page generated: 07 Nov 2026, 06:56 UTC
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CVE-2026-123271

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 reso…

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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.
CVSS 8.0 (HIGH)

Attention and evidence

HYPE SCORE
0.0/10
REALITY · THREAT PRIORITY
2.8–5.3/10
Missing inputs: range of priority

Evidence confidence: Insufficient evidence

Why this priority?
  • Technical severity: CVSS 8: +2.80

Fresh prediction unavailable

General review priority, not probability, victim count or asset-specific risk. A range covers missing CVSS/EPSS inputs within the current evidence state.

Sources: 1 documents and public datasets.

Hype components

Headline sample (25%)
0/100
Press, 30 days (60%)
0/100
Grounded branding (15%)
0/100
HYPE TOTAL0/100

Sources and documents

Latest Vulnerabilities
Technical advisory · 05 Nov 2026, 18:45 · CVE-2026-123271 - ChatCLI before v1.215.2 Origin Validation Error via Unvalidated MCP OAuth Resource Indicator

Score evolution

● Hype   ● Reality

First record: hype 0.0 · reality 2.8 (2026-11-05 19:31). The curve appears once the score changes.

Public exploit evidence

0

Public exploit entries / repo candidates

Evidence context and dated references

Reality is general threat/review priority, combining observed exploitation, CVSS severity and fresh EPSS. Evidence confidence is separate. This is not calibrated risk, a victim count or an asset-specific assessment. A range reflects missing numeric inputs. Published 1 days ago. Exploitation evidence usually takes weeks to show up: a low reality score can mean there is no data yet, not that the flaw is mild.

Evidence in context

Confidence in exploitation evidence
Insufficient evidence
Priority basis
Exploitation in attacks unconfirmed; CVSS 8; fresh prediction unavailable
Attention, last 30 days
0 distinct story titles; 0 press documents; 0 publisher domains.
Technical potential
network access, no prior privileges, user interaction, additional attack conditions.
Observed activity
No exploitation observation is recorded.
Known scale
Not quantified.
Evidence confidence basis
Insufficient evidence

Score evaluated: 2026-11-05 19:31:22.954284+00:00 · EPSS snapshot: not available

Source event timeline
Published
05 Nov 2026, 18:45
Score calculated
05 Nov 2026, 19:31