CVE-2026-12210Public exploitNetwork attack vector

SSRF via localhost prefix validation bypass

Published Jun 15, 2026 · Updated Jun 15, 2026

SSRF in Python UTCP 1.1.0 allows attackers to redirect GraphQL and WebSocket requests to attacker-controlled hosts. GraphQLCommunicationProtocol._enforce_https_or_localhost and WebSocketCallTemplate.validate_url accept crafted remote hostnames because they test URL prefixes instead of parsing and validating the actual host. Exploitation requires control over endpoint URL configuration and exposes authorization headers, API keys, and tool-call data.

CVSS severity6.3
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in Python UTCP 1.1.0 allows attackers to redirect GraphQL and WebSocket requests to attacker-controlled hosts. GraphQLCommunicationProtocol._enforce_https_or_localhost and WebSocketCallTemplate.validate_url accept crafted remote hostnames because they test URL prefixes instead of parsing and validating the actual host. Exploitation requires control over endpoint URL configuration and exposes authorization headers, API keys, and tool-call data.

The record

CVE
CVE-2026-12210
Published
Jun 15, 2026
Updated
Jun 15, 2026
Vendor
Universal Tool Calling Protocol
Product
Python UTCP
Classifications
CWE-918
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Universal Tool Calling Protocol · Python UTCPversion=1.1.0

Published CVSS scores

6.5VulDB CNAAV:N/AC:L/Au:S/C:P/I:P/A:P
6.3VulDB CNACVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
2.1VulDB CNACVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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