CVE-2023-3493Network attack vector

Spreadsheet formula execution via unescaped CSV fields

Published Jun 30, 2023 · Updated Nov 4, 2024

CSV injection in FOSSBilling before 0.5.3 allows remote authenticated users to inject spreadsheet formulas into exported records. The CSV writer in src/di.php inserted headers and data rows without applying League CSV's EscapeFormula formatter, leaving formula-leading cells active. An authenticated user must supply exportable data, and another user must open the CSV in formula-capable software for formulas to execute in the opener's context.

CVSS severity8.0
High
EPSS probability0.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

CSV injection in FOSSBilling before 0.5.3 allows remote authenticated users to inject spreadsheet formulas into exported records. The CSV writer in src/di.php inserted headers and data rows without applying League CSV's EscapeFormula formatter, leaving formula-leading cells active. An authenticated user must supply exportable data, and another user must open the CSV in formula-capable software for formulas to execute in the opener's context.

The record

CVE
CVE-2023-3493
Published
Jun 30, 2023
Updated
Nov 4, 2024
Vendor
FOSSBilling
Product
FOSSBilling
Classifications
CWE-1236, T1204.002
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 30, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 4, 2024Record 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 <0.5.3
  2. Affected versionversion=unspecified <0.5.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

FOSSBilling · FOSSBillingversion=0 <0.5.3; version=unspecified <0.5.3

Published CVSS scores

8.0NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
7.7huntr.devCVSS:3.0/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/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.

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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 exploitUnconfirmed

Weakness, pattern, technique

CWE-1236Improper Neutralization of Formula Elements in a CSV File
T1204.002User Execution: Malicious File

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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