CVE-2024-56410Public exploitNetwork attack vector

Stored XSS via unescaped custom property names

Published Jan 3, 2025 · Updated Jan 3, 2025

Stored XSS in PHPOffice PhpSpreadsheet affected versions allows attackers to execute JavaScript via crafted XLSX custom properties. Html::generateMeta inserts an attacker-controlled custom-property name into an HTML meta element without escaping it. Exploitation requires a consuming application to convert the crafted workbook to HTML and a user to view that output, exposing the browser context to script execution.

CVSS severity4.8
Medium
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in PHPOffice PhpSpreadsheet affected versions allows attackers to execute JavaScript via crafted XLSX custom properties. Html::generateMeta inserts an attacker-controlled custom-property name into an HTML meta element without escaping it. Exploitation requires a consuming application to convert the crafted workbook to HTML and a user to view that output, exposing the browser context to script execution.

The record

CVE
CVE-2024-56410
Published
Jan 3, 2025
Updated
Jan 3, 2025
Vendor
PHPOffice
Product
PhpSpreadsheet
Classifications
CWE-79, T1204.002
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Jan 3, 2025CVE publishedPublication date reported by the CVE source.
  2. Jan 3, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.29.7
  2. Affected versionversion=>= 2.0.0, < 2.1.6
  3. Affected versionversion=>= 2.2.0, < 2.3.5
  4. Affected versionversion=>= 3.0.0, < 3.7.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

PHPOffice · PhpSpreadsheetversion=< 1.29.7; version=>= 2.0.0, < 2.1.6; version=>= 2.2.0, < 2.3.5; version=>= 3.0.0, < 3.7.0

Published CVSS scores

5.4NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
4.8GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:N/SC:L/SI:L/SA: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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.002Malicious 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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