CVE-2021-1826
MEDIUMCVSS 6.1/10EPSS 1.03%
Last modified
CVE-2021-1826 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. A logic issue was addressed with improved restrictions. This issue is fixed in macOS Big Sur 11.3, iOS 14.5 and iPadOS 14.5, watchOS 7.4, tvOS 14.5. EPSS estimates a 1.03% chance of exploitation in the next 30 days.
Description
A logic issue was addressed with improved restrictions. This issue is fixed in macOS Big Sur 11.3, iOS 14.5 and iPadOS 14.5, watchOS 7.4, tvOS 14.5. Processing maliciously crafted web content may lead to universal cross site scripting.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Apple | Ipados | < 14.5 |
| Apple | Iphone Os | < 14.5 |
| Apple | Macos | >= 11.0, < 11.3 |
| Apple | Tvos | < 14.5 |
| Apple | Watchos | < 7.4 |
References
- https://support.apple.com/en-us/HT212317Vendor Advisory
- https://support.apple.com/en-us/HT212323Vendor Advisory
- https://support.apple.com/en-us/HT212324Vendor Advisory
- https://support.apple.com/en-us/HT212325Vendor Advisory
- https://support.apple.com/en-us/HT212317Vendor Advisory
- https://support.apple.com/en-us/HT212323Vendor Advisory
- https://support.apple.com/en-us/HT212324Vendor Advisory
- https://support.apple.com/en-us/HT212325Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-1826?
A logic issue was addressed with improved restrictions. This issue is fixed in macOS Big Sur 11.3, iOS 14.5 and iPadOS 14.5, watchOS 7.4, tvOS 14.5. Processing maliciously crafted web content may lead to universal cross site scripting.
How severe is CVE-2021-1826?
CVE-2021-1826 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 1.03% probability of exploitation in the next 30 days.
How do I fix CVE-2021-1826?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-1826?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST