VulnTideExploited vulnerabilities, by vendor. Data as of 28 Oct 2026.
Known exploitedIn CISA's KEV catalog since 22 May 2023Ransomware use: unknown
Apple Multiple Products

CVE-2023-28204: Apple Multiple Products WebKit Out-of-Bounds Read Vulnerability

Is it exploited?

Yes. CISA added it to the Known Exploited Vulnerabilities catalog on 22 May 2023, 32 days before the CVE record was published.

How likely is exploitation in the next 30 days?
14.3%

EPSS score, percentile 96.6 of all scored records

How severe?
6.5 Medium

CVSS v3.1 base score, from CISA's enrichment of the record

What should I do?

Required action (CISA), due 12 Jun 2023: Apply updates per vendor instructions.

The CVE record links no vendor advisory, patch or mitigation.

Which versions are affected?

Affected: before 13.4; before 16.5; before 9.5; before 15.7; before 16.5; before 16.5

Versions by product

Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

What to do

Required action, set by CISA

Apply updates per vendor instructions.

CISA due date for this action: 12 June 2023.

Advisories and patches

The CVE record links no vendor advisory, patch or mitigation.

Linked from CISA's catalog entry

Affected products and versions

As listed in the CVE record.

Apple macOS
StatusVersions
Affectedbefore 13.4
Apple Safari
StatusVersions
Affectedbefore 16.5
Apple watchOS
StatusVersions
Affectedbefore 9.5
Apple iOS and iPadOS
StatusVersions
Affectedbefore 15.7
Apple iOS and iPadOS
StatusVersions
Affectedbefore 16.5
Apple tvOS
StatusVersions
Affectedbefore 16.5

Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

About this vulnerability

Apple iOS, iPadOS, macOS, tvOS, watchOS, and Safari WebKit contain an out-of-bounds read vulnerability that may disclose sensitive information when processing maliciously crafted web content. This vulnerability could impact HTML parsers that use WebKit, including but not limited to Apple Safari and non-Apple products which rely on WebKit for HTML processing.

Summary: CISA's KEV catalog, as of 28 Oct 2026.

  • CISA added CVE-2023-28204 to its Known Exploited Vulnerabilities (KEV) catalog on 22 May 2023.
  • CISA's ransomware flag for this entry is "Unknown": no evidence of ransomware use in the catalog, which is not proof of none.
  • The due date CISA sets for the required action is 12 Jun 2023.
  • The CVE record was published on 23 Jun 2023, 32 days after it was added to KEV.
  • The CVE record carries a CVSS v3.1 base score of 6.5 (Medium), taken from CISA's enrichment of the record.
  • FIRST's EPSS model puts the probability of exploitation in the next 30 days at 14.3% (percentile 96.6), as of 28 Oct 2026.
  • CISA's SSVC assessment in the CVE record: exploitation active, automatable no, technical impact partial.

Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026. About the data.

Description

An out-of-bounds read was addressed with improved input validation. This issue is fixed in watchOS 9.5, tvOS 16.5, macOS Ventura 13.4, iOS 15.7.6 and iPadOS 15.7.6, Safari 16.5, iOS 16.5 and iPadOS 16.5. Processing web content may disclose sensitive information. Apple is aware of a report that this issue may have been actively exploited.

Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

Weakness

CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record and the KEV entry.

Timeline

DateEvent
22 May 2023Added to CISA KEV
12 Jun 2023CISA due date for the required action
23 Jun 2023CVE record published
21 Oct 2025CVE record last updated

References

More exploited Apple vulnerabilities

  • CVE-2026-86950: Apple Multiple Products Out-of-Bounds Write Vulnerability (added 29 Sep 2026)
  • CVE-2026-65400: Apple macOS Improper Authentication Vulnerability (added 18 Aug 2026)
  • CVE-2025-31277: Apple Multiple Products Buffer Overflow Vulnerability (added 20 Mar 2026)
  • CVE-2025-43510: Apple Multiple Products Improper Locking Vulnerability (added 20 Mar 2026)
  • CVE-2025-43520: Apple Multiple Products Classic Buffer Overflow Vulnerability (added 20 Mar 2026)
  • CVE-2021-30952: Apple Multiple Products Integer Overflow or Wraparound Vulnerability (added 5 Mar 2026)