CVE-2024-48917Public exploitNetwork attack vector

Data disclosure via UTF-7 charset detection bypass

Published Nov 18, 2024 · Updated Nov 18, 2024

XXE in PHPOffice PhpSpreadsheet affected versions allows remote attackers to read server-accessible data through a crafted XLSX file. XmlScanner.findCharSet accepts a decoy double-quoted UTF-8 declaration in a trailing UTF-7 comment, so it misses the real single-quoted UTF-7 header and permits external-entity processing. Exploitation requires an application to process an attacker-supplied XLSX file, and the reported impact is limited to confidentiality.

CVSS severity7.5
High
EPSS probability0.73%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

XXE in PHPOffice PhpSpreadsheet affected versions allows remote attackers to read server-accessible data through a crafted XLSX file. XmlScanner.findCharSet accepts a decoy double-quoted UTF-8 declaration in a trailing UTF-7 comment, so it misses the real single-quoted UTF-7 header and permits external-entity processing. Exploitation requires an application to process an attacker-supplied XLSX file, and the reported impact is limited to confidentiality.

The record

CVE
CVE-2024-48917
Published
Nov 18, 2024
Updated
Nov 18, 2024
Vendor
PHPOffice
Product
PhpSpreadsheet
Classifications
CWE-611, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 18, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 18, 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=0 <1.29.4
  2. Affected versionversion=< 1.29.4
  3. Affected versionversion=>= 2.0.0, < 2.1.3
  4. Affected versionversion=2.0.0 <2.1.3
  5. Affected versionversion=>= 2.2.0, < 2.3.2
  6. Affected versionversion=2.2.0 <2.3.2
  7. Affected versionversion=>= 3.3.0, < 3.4.0
  8. Affected versionversion=3.3.0 <3.4.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

PHPOffice · PhpSpreadsheetversion=0 <1.29.4; version=< 1.29.4; version=>= 2.0.0, < 2.1.3; version=2.0.0 <2.1.3; version=>= 2.2.0, < 2.3.2; version=2.2.0 <2.3.2; version=>= 3.3.0, < 3.4.0; version=3.3.0 <3.4.0

Published CVSS scores

7.5GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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-611Improper Restriction of XML External Entity Reference
T1190Exploit Public-Facing Application

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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