CVE-2023-40403Network attack vector

Sensitive-information disclosure via undisclosed memory mishandling

Published Sep 26, 2023 · Updated Nov 4, 2025

Information disclosure in libxslt in affected Apple operating systems allows remote attackers to read sensitive data via web content. Apple states only that libxslt required improved memory handling and has not disclosed the faulty operation or the sensitive data exposed. Exploitation requires a user to process attacker-controlled web content; the reported consequence excludes file modification and service interruption.

CVSS severity6.5
Medium
EPSS probability1.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in libxslt in affected Apple operating systems allows remote attackers to read sensitive data via web content. Apple states only that libxslt required improved memory handling and has not disclosed the faulty operation or the sensitive data exposed. Exploitation requires a user to process attacker-controlled web content; the reported consequence excludes file modification and service interruption.

The record

CVE
CVE-2023-40403
Published
Sep 26, 2023
Updated
Nov 4, 2025
Vendor
Apple
Product
iOS and iPadOS
Classifications
Unavailable
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 26, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 4, 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=unspecified <16.7
  2. Affected versionversion=unspecified <17

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Apple · iOS and iPadOSversion=unspecified <16.7; version=unspecified <17
Apple · tvOSversion=unspecified <17
Apple · macOSversion=unspecified <12.7; version=unspecified <13.6; version=unspecified <14
Apple · watchOSversion=unspecified <10

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/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 exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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