CVE-2020-5298Public exploitNetwork attack vector

Reflected XSS via unescaped CSV column names

Published Jun 3, 2020 · Updated Aug 4, 2024

Reflected XSS in October CMS 1.0.319 through 1.0.465 allows attackers to execute script in an importer's browser via a crafted CSV. The import-column partial renders first-row CSV column names into an anchor without HTML escaping, so markup becomes executable content. A backend user with ImportExportController import permission must be induced to upload the file; script runs with that user's session privileges.

CVSS severity4.0
Medium
EPSS probability0.91%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in October CMS 1.0.319 through 1.0.465 allows attackers to execute script in an importer's browser via a crafted CSV. The import-column partial renders first-row CSV column names into an anchor without HTML escaping, so markup becomes executable content. A backend user with ImportExportController import permission must be induced to upload the file; script runs with that user's session privileges.

The record

CVE
CVE-2020-5298
Published
Jun 3, 2020
Updated
Aug 4, 2024
Vendor
October CMS
Product
October CMS
Classifications
CWE-79, CWE-87, 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

4.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
4.0GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:L/I:L/A:N
3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/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.

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-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-87Improper Neutralization of Alternate XSS Syntax
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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