CVE-2024-56408Public exploitNetwork attack vector

Arbitrary browser script execution via unsanitized quantity

Published Jan 3, 2025 · Updated May 20, 2025

Reflected XSS in PHPOffice PhpSpreadsheet allows remote attackers to execute JavaScript in a user's browser through a crafted POST request. Convert-Online.php reads the POST quantity field and writes it into the HTML response without validating it as numeric, allowing injected markup to become executable browser content. Exploitation requires the sample script to be web-accessible and a user to visit an attacker-controlled page that submits the form.

CVSS severity8.3
High
EPSS probability0.40%
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 PHPOffice PhpSpreadsheet allows remote attackers to execute JavaScript in a user's browser through a crafted POST request. Convert-Online.php reads the POST quantity field and writes it into the HTML response without validating it as numeric, allowing injected markup to become executable browser content. Exploitation requires the sample script to be web-accessible and a user to visit an attacker-controlled page that submits the form.

The record

CVE
CVE-2024-56408
Published
Jan 3, 2025
Updated
May 20, 2025
Vendor
PHPOffice
Product
PhpSpreadsheet
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 3, 2025CVE publishedPublication date reported by the CVE source.
  2. May 20, 2025Record 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=< 1.29.7
  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 privilegesunauthenticated

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

8.3GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/SC:L/SI:H/SA:L
8.2PHPOfficeCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N
5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/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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