CVE-2024-56365Public exploitNetwork attack vector

Reflected XSS via unsanitized download parameters

Published Jan 3, 2025 · Updated Jan 3, 2025

Reflected XSS in PHPOffice PhpSpreadsheet allows remote attackers to execute arbitrary JavaScript through the download sample. The Downloader constructor places the name and type GET parameters into an error response without output sanitization. The samples/download.php script must be web-accessible and a user must follow a crafted URL; script then runs in that user's browser context.

CVSS severity8.3
High
EPSS probability0.32%
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 arbitrary JavaScript through the download sample. The Downloader constructor places the name and type GET parameters into an error response without output sanitization. The samples/download.php script must be web-accessible and a user must follow a crafted URL; script then runs in that user's browser context.

The record

CVE
CVE-2024-56365
Published
Jan 3, 2025
Updated
Jan 3, 2025
Vendor
PHPOffice
Product
PhpSpreadsheet
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
unauthenticated

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

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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

8.3PHPOfficeCVSS: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

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')
T1204.001User Execution: Malicious Link

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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