CVE-20XX-?
agent?

CVE-2026-123271

5.1 MEDIUM 0.1% exploit odds Fix listed Crypto Device

What it is

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.

At a glance

Exploitability
Can be exploited over the network without logging in, but needs a user to act. Limited direct impact.
Exploit odds
0.1% chance of exploitation in the next 30 days (EPSS).
Fix
A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

  1. ReservedThe CVE id was reserved by its CNA
  2. PublishedDisclosed publicly on CVE.org and NVD
  3. Last updatedMost recent change to the record

Why it ranks here

Details

Published
Last modified
Exploit probability
0.1% · EPSS, next 30 days
Weakness
CWE-346
Record status
Received

Attack profile CVSS 4.0 · 5.1

Attack vector
Network
Complexity
Low
Attack requirements
Present
Privileges needed
None
User interaction
Active
Confidentiality
None
Integrity
None
Availability
None
Raw vector

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

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2026-123271.md and follow it. Check whether this project is affected by CVE-2026-123271. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record