Content Security Policy bypass via state mismanagement
Published Mar 25, 2026 · Updated Mar 25, 2026
Protection mechanism failure in WebKit across affected Apple operating systems and Safari allows remote attackers to bypass CSP. Apple identifies faulty state management but does not disclose the affected WebKit state transition or incorrect operation. Processing attacker-controlled web content is the gate; the reported consequence is non-enforcement of Content Security Policy, not direct code execution.
Summary
What happened
Protection mechanism failure in WebKit across affected Apple operating systems and Safari allows remote attackers to bypass CSP. Apple identifies faulty state management but does not disclose the affected WebKit state transition or incorrect operation. Processing attacker-controlled web content is the gate; the reported consequence is non-enforcement of Content Security Policy, not direct code execution.
The record
- CVE
- CVE-2026-20665
- Published
- Mar 25, 2026
- Updated
- Mar 25, 2026
- Vendor
- Apple
- Product
- iOS and iPadOS
- Classifications
- CWE-693, T1189
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 25, 2026CVE publishedPublication date reported by the CVE source.
- Mar 25, 2026Record 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.
- Affected versionversion=0 <18.7.7
- Affected versionversion=0 <26.4
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
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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