Apple Multiple Products WebKit Out-of-Bounds Read 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.
- Vendor
- Apple
- Product
- Multiple Products
- CVSS
- 6.5
- EPSS (exploit probability)
- 14.3%
- Status
- kev
- CISA patch-by (BOD 22-01)
- Added to KEV
Is CVE-2023-28204 being exploited?
Yes. CISA added CVE-2023-28204 to its Known Exploited Vulnerabilities catalog on . CISA only lists a CVE when it has reliable evidence of exploitation in the wild.
FIRST's EPSS model puts the probability of exploitation activity in the next 30 days at 14.3% (scored October 14, 2026).
- CISA KEV[ LISTED ]
- ENISA EUVD (exploited)[ — ]
- CIRCL KEV[ — ]
Catalog snapshot 2026-10-21. Full cross-catalog view: /kev-comparison
What to do
CISA required actionApply updates per vendor instructions.
US federal civilian agencies must remediate by (21 days after listing) under BOD 22-01. Everyone else: that deadline is a sensible upper bound, not a target. Vendor guidance and the NVD record are linked under Source above.
Other Apple CVEs we track
| CVE / Vulnerability | Severity | CVSS | EPSS | Added to KEV |
|---|---|---|---|---|
| CVE-2026-86950 CoreGraphics memory confusion in Apple iOS 26, iPadOS, macOS 26, macOS 15write-up | [ HIGH ] | 8.8 | 1.2% | |
| CVE-2026-65400 Apple macOS Improper Authentication Vulnerability | [ CRITICAL ] | 9.8 | 1.7% | |
| CVE-2025-43520 Apple Multiple Products Classic Buffer Overflow Vulnerability | [ MEDIUM ] | 5.5 | 0.4% | |
| CVE-2025-43510 Apple Multiple Products Improper Locking Vulnerability | [ HIGH ] | 7.8 | 0.4% | |
| CVE-2025-31277 Apple Multiple Products Buffer Overflow Vulnerability | [ HIGH ] | 8.8 | 1.7% | |
| CVE-2023-43000 Apple Multiple products Use-After-Free Vulnerability | [ HIGH ] | 8.8 | 4.0% | |
| CVE-2023-41974 Apple iOS and iPadOS Use-After-Free Vulnerability | [ HIGH ] | 7.8 | 2.0% | |
| CVE-2021-30952 Apple Multiple Products Integer Overflow or Wraparound Vulnerability | [ HIGH ] | 7.8 | 7.0% |