CVE-2026-55383Public exploitNetwork attack vector

Cross-company disclosure via unchecked document-token types

Published Oct 14, 2026 · Updated Oct 14, 2026

Authorization flaws in InvoiceShelf before 2.4.0 allow remote attackers to read other companies' documents via public customer links. InvoicePdfController, EstimatePdfController, and PaymentPdfController resolve EmailLog.mailable_id without checking mailable_type; their JSON handlers also omit EmailLog::isExpired(). Exploitation requires an issued token and matching numeric document IDs; expired tokens remain usable for JSON disclosure, while unexpired mismatched view links also mark invoices or estimates as viewed and trigger configured notifications.

CVSS severity8.2
High
EPSS probability0.42%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization flaws in InvoiceShelf before 2.4.0 allow remote attackers to read other companies' documents via public customer links. InvoicePdfController, EstimatePdfController, and PaymentPdfController resolve EmailLog.mailable_id without checking mailable_type; their JSON handlers also omit EmailLog::isExpired(). Exploitation requires an issued token and matching numeric document IDs; expired tokens remain usable for JSON disclosure, while unexpired mismatched view links also mark invoices or estimates as viewed and trigger configured notifications.

The record

CVE
CVE-2026-55383
Published
Oct 14, 2026
Updated
Oct 14, 2026
Vendor
InvoiceShelf
Product
InvoiceShelf
Classifications
CWE-285, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 14, 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=< 2.4.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

InvoiceShelf · InvoiceShelfversion=< 2.4.0

Published CVSS scores

8.2GitHub CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/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-285Improper Authorization
T1190Exploit Public-Facing Application

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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