CVE-2026-55156Public exploitNetwork attack vectorHinoki check available

Unauthenticated JSONL disclosure via session ID traversal

Published Sep 28, 2026 · Updated Sep 28, 2026

Path traversal in Ooples Token Optimizer MCP before 5.1.0 allows remote attackers to read JSONL files through dashboard session APIs. The session-summary and session-events handlers pass an unvalidated sessionId into path.join and then read the resolved file outside the intended log directory. Exploitation requires network access to the dashboard; disclosure is limited to JSONL files readable by its process.

CVSS severity5.3
Medium
EPSS probability0.45%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Path traversal in Ooples Token Optimizer MCP before 5.1.0 allows remote attackers to read JSONL files through dashboard session APIs. The session-summary and session-events handlers pass an unvalidated sessionId into path.join and then read the resolved file outside the intended log directory. Exploitation requires network access to the dashboard; disclosure is limited to JSONL files readable by its process.

The record

CVE
CVE-2026-55156
Published
Sep 28, 2026
Updated
Sep 28, 2026
Vendor
Ooples
Product
Token Optimizer MCP
Classifications
CWE-22, T1005
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 28, 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=< 5.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Ooples · Token Optimizer MCPversion=< 5.1.0

Published CVSS scores

5.3GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

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.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1005Data from Local System

Public exploit references

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

Technologies

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Your stack

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