CVE-2021-42245Public exploitNetwork attack vector

Stored script execution via unfiltered page fields

Published Jun 6, 2022 · Updated Aug 4, 2024

Cross-site scripting in FlatCore-CMS 2.0.9 allows attackers to execute script in a visitor's browser through crafted page fields. The pages.edit.php workflow stores meta-tag and content values without filtering, so a payload entered during page creation executes when the resulting home page is viewed. Exploitation requires a page-creation path and a victim who loads the affected page; the demonstrated consequence is script execution in that visitor's browser.

CVSS severity6.1
Medium
EPSS probability0.71%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in FlatCore-CMS 2.0.9 allows attackers to execute script in a visitor's browser through crafted page fields. The pages.edit.php workflow stores meta-tag and content values without filtering, so a payload entered during page creation executes when the resulting home page is viewed. Exploitation requires a page-creation path and a victim who loads the affected page; the demonstrated consequence is script execution in that visitor's browser.

The record

CVE
CVE-2021-42245
Published
Jun 6, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 6, 2022CVE 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.3NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
6.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/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.

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

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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