CVE-2023-3823Network attack vector

Local file disclosure via global XML state

Published Aug 11, 2023 · Updated Feb 13, 2025

XXE in PHP 8.0.* before 8.0.30, 8.1.* before 8.1.22, and 8.2.* before 8.2.8 allows remote attackers to read local files via XML parsing. PHP XML functions trust process-global libxml settings that other modules can leave with external entities enabled, so crafted XML resolves local entities. Exploitation requires an application that parses attacker-influenced XML in a process where another module changed that shared state; impact is local-file confidentiality disclosure.

CVSS severity8.6
High
EPSS probability1.64%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

XXE in PHP 8.0.* before 8.0.30, 8.1.* before 8.1.22, and 8.2.* before 8.2.8 allows remote attackers to read local files via XML parsing. PHP XML functions trust process-global libxml settings that other modules can leave with external entities enabled, so crafted XML resolves local entities. Exploitation requires an application that parses attacker-influenced XML in a process where another module changed that shared state; impact is local-file confidentiality disclosure.

The record

CVE
CVE-2023-3823
Published
Aug 11, 2023
Updated
Feb 13, 2025
Vendor
The PHP Group
Product
PHP
Classifications
CWE-611, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 11, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 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=8.0.* <8.0.30
  2. Affected versionversion=8.1.* <8.1.22
  3. Affected versionversion=8.2.* <8.2.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The PHP Group · PHPversion=8.0.* <8.0.30; version=8.1.* <8.1.22; version=8.2.* <8.2.8

Published CVSS scores

8.6GitHub Security AdvisoryCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-611Improper Restriction of XML External Entity Reference
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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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