CVE-2020-5299Public exploitNetwork attack vector

Spreadsheet formula execution via unescaped CSV cells

Published Jun 3, 2020 · Updated Aug 4, 2024

CSV formula injection in October CMS 1.0.319 through 1.0.465 allows remote authenticated users to create malicious CSV exports. ImportExportController and ExportModel write attacker-controlled cells without prefixing formula-leading characters such as equals, plus, minus, or at signs. Exploitation requires control of exportable data, a victim who exports and opens the file, and spreadsheet software that evaluates the formula despite its safety checks.

CVSS severity5.1
Medium
EPSS probability1.00%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

CSV formula injection in October CMS 1.0.319 through 1.0.465 allows remote authenticated users to create malicious CSV exports. ImportExportController and ExportModel write attacker-controlled cells without prefixing formula-leading characters such as equals, plus, minus, or at signs. Exploitation requires control of exportable data, a victim who exports and opens the file, and spreadsheet software that evaluates the formula despite its safety checks.

The record

CVE
CVE-2020-5299
Published
Jun 3, 2020
Updated
Aug 4, 2024
Vendor
October CMS
Product
October CMS
Classifications
CWE-77, T1204.002
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 3, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 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=>= 1.0.319, < 1.0.466

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

October CMS · October CMSversion=>= 1.0.319, < 1.0.466

Published CVSS scores

4.0GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:L/I:L/A:N
5.1NIST NVDCVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:L/I:L/A:L
4.6NIST NVDAV:N/AC:H/Au:S/C:P/I:P/A:P

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.

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

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 exploitPublished

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1204.002User Execution: Malicious File

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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