CVE-2026-36453Network attack vectorHinoki check available

Arbitrary file access via unchecked extra-variable references

Published Sep 13, 2026 · Updated Sep 13, 2026

IDOR in Rhymix before 2.1.31 allows attackers to access arbitrary files through file-upload extra variables in board posts. The document extra-variable handler accepted a referenced upload identifier without verifying that the referenced file belonged to the submitting user or post. Exploitation requires a board configured with the file-upload extra-variable type introduced in 2.1.18, and successful requests disclose the selected file.

CVSS severityUnavailable
Unscored
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

IDOR in Rhymix before 2.1.31 allows attackers to access arbitrary files through file-upload extra variables in board posts. The document extra-variable handler accepted a referenced upload identifier without verifying that the referenced file belonged to the submitting user or post. Exploitation requires a board configured with the file-upload extra-variable type introduced in 2.1.18, and successful requests disclose the selected file.

The record

CVE
CVE-2026-36453
Published
Sep 13, 2026
Updated
Sep 13, 2026
Vendor
Poesis Inc.
Product
Rhymix
Classifications
T1005
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 13, 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=0 <2.1.31

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

Poesis Inc. · Rhymixversion=0 <2.1.31

Published CVSS scores

No CVSS assessment is available in this record.

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

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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