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CVE-2026-101059· NVD / CVE Program· CNA VulnCheck

utcp-http before 1.1.4 OAuth2 tokenUrl Trust Boundary Bypass

utcp-http before 1.1.4 fails to validate the OAuth2 tokenUrl field from remote OpenAPI specifications, allowing attackers to redirect credential submission to arbitrary endpoints. When a victim registers an attacker-controlled OpenAPI spec and invokes a generated OAuth2-protected tool, the library POSTs the victim's client_id and client_secret to the attacker-supplied token endpoint without URL validation.

HighCVSS 7.1 · v4.0—No exploit Fix available
Published
Sep 27, 2026
Updated
Sep 30, 2026
EPSS
0.2% · 7th percentile
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Report tools

JSON

Action score

28

Monitor

Low priority for now.

CVSS
28 / 40 · 7.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
proof of concept
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · VulnCheck
7.1
NVD has not scored this yet; the score shown is the CNA’s.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Affected systems

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (VulnCheck). Independent of NVD's CPE analysis and usually ahead of it.

  • universal-tool-calling-protocol python-utcp

    • 1.1.4not affected
    • before 1.1.4affected · semver

Same product

universal-tool-calling-protocol: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-101060python-utcp before 1.1.4 SSRF via unvalidated HTTP redirects
    33Monitor
  • CVE-2026-45369python-utcp: Command Injection via Unsanitized Argument Substitution in CLI Communication Protocol
    33Monitor
  • CVE-2026-45370python-utcp: Full Process Environment Exposed to CLI Subprocess - Secrets Leakage via Command Injection
    30Monitor
  • CVE-2026-101058python-utcp before 1.1.12 SSRF via Remote HTTP Manual
    28Monitor
  • CVE-2026-44661python-utcp: SSRF via attacker-controlled OpenAPI servers[0].url in HTTP communication protocol
    18Monitor
  • CVE-2026-101061utcp-gql and utcp-websocket before 1.1.1 SSRF via URL validation bypass
    9Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
universal-tool-calling-protocol python-utcp1.1.4Vendor (CNA)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-1010600 days apartpython-utcp before 1.1.4 SSRF via unvalidated HTTP redirects
    33Monitor
  • CVE-2026-1010580 days apartpython-utcp before 1.1.12 SSRF via Remote HTTP Manual
    28Monitor
  • CVE-2026-44661136 days apartpython-utcp: SSRF via attacker-controlled OpenAPI servers[0].url in HTTP communication protocol
    18Monitor
  • CVE-2026-1010610 days apartutcp-gql and utcp-websocket before 1.1.1 SSRF via URL validation bypass
    9Monitor
  • CVE-2026-12210105 days apartuniversal-tool-calling-protocol python-utcp utcp-gql/utcp-websocket server-side request forgery
    8Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
P
Scope
X

Weakness class (CWE)

CWE-918 · Server-Side Request Forgery (SSRF)

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

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Change log

  1. Fix✗ → ✓
  2. SSVC exploitation— → poc

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References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records