How severe is CVE-2011-3426?

CVE-2011-3426 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2011-3426 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-3426?

CVE-2011-3426 primarily affects Apple Iphone Os. In total, 29 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2011-3426?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2011-3426 published?

CVE-2011-3426 was published on 2011-10-14 and last updated on 2026-06-16.

CVE-2011-3426

CVE-2011-3426 is a medium-severity vulnerability in Apple Iphone Os with a CVSS 2.0 base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 2.0 base score 4.3)
EPSS exploit prediction: 2% (76th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Apple Iphone Os
Published: 2011-10-14
Last modified: 2026-06-16

Description

Cross-site scripting (XSS) vulnerability in Safari in Apple iOS before 5 allows remote web servers to inject arbitrary web script or HTML via a file accompanied by a "Content-Disposition: attachment" HTTP header.

Frequently asked questions

What is CVE-2011-3426?: Cross-site scripting (XSS) vulnerability in Safari in Apple iOS before 5 allows remote web servers to inject arbitrary web script or HTML via a file accompanied by a "Content-Disposition: attachment" HTTP header.
How severe is CVE-2011-3426?: CVE-2011-3426 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2011-3426 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-3426?: CVE-2011-3426 primarily affects Apple Iphone Os. In total, 29 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-3426?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2011-3426 published?: CVE-2011-3426 was published on 2011-10-14 and last updated on 2026-06-16.

References

Affected products (29)

cpe:2.3:o:apple:iphone_os:3.0:-:iphone:*:*:*:*:*
cpe:2.3:o:apple:iphone_os:3.1:*:*:*:*:*:*:*
cpe:2.3:o:apple:iphone_os:3.1:-:iphone:*:*:*:*:*
cpe:2.3:o:apple:iphone_os:3.1:-:ipodtouch:*:*:*:*:*
cpe:2.3:o:apple:iphone_os:3.1.2:-:iphone:*:*:*:*:*
cpe:2.3:o:apple:iphone_os:3.1.3:-:iphone:*:*:*:*:*
cpe:2.3:o:apple:iphone_os:3.2:-:iphone:*:*:*:*:*
cpe:2.3:o:apple:iphone_os:3.2:-:ipodtouch:*:*:*:*:*
cpe:2.3:o:apple:iphone_os:3.2.1:*:*:*:*:*:*:*
cpe:2.3:o:apple:iphone_os:3.2.1:-:ipad:*:*:*:*:*
cpe:2.3:o:apple:iphone_os:3.2.2:*:*:*:*:*:*:*
cpe:2.3:o:apple:iphone_os:4.0:*:*:*:*:*:*:*
cpe:2.3:o:apple:iphone_os:4.0:-:iphone:*:*:*:*:*
cpe:2.3:o:apple:iphone_os:4.0:-:ipodtouch:*:*:*:*:*
cpe:2.3:o:apple:iphone_os:4.0.1:*:*:*:*:*:*:*
cpe:2.3:o:apple:iphone_os:4.0.1:-:iphone:*:*:*:*:*
cpe:2.3:o:apple:iphone_os:4.0.1:-:ipodtouch:*:*:*:*:*
cpe:2.3:o:apple:iphone_os:4.0.2:*:*:*:*:*:*:*
cpe:2.3:o:apple:iphone_os:4.1:*:*:*:*:*:*:*
cpe:2.3:o:apple:iphone_os:4.2.1:*:*:*:*:*:*:*
cpe:2.3:o:apple:iphone_os:4.2.5:*:*:*:*:*:*:*
cpe:2.3:o:apple:iphone_os:4.2.8:*:*:*:*:*:*:*
cpe:2.3:o:apple:iphone_os:4.3.0:*:*:*:*:*:*:*
cpe:2.3:o:apple:iphone_os:4.3.1:*:*:*:*:*:*:*
cpe:2.3:o:apple:iphone_os:4.3.2:*:*:*:*:*:*:*
cpe:2.3:o:apple:iphone_os:4.3.3:*:*:*:*:*:*:*
cpe:2.3:o:apple:iphone_os:4.3.5:*:*:*:*:*:*:*
cpe:2.3:o:apple:iphone_os:4.3.5:-:ipad:*:*:*:*:*
cpe:2.3:o:apple:iphone_os:4.3.5:-:ipodtouch:*:*:*:*:*

More vulnerabilities in Apple Iphone Os

CVE-2025-43300 — Critical (CVSS 10.0): An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 15.8.5 and iPadOS…
CVE-2025-24201 — Critical (CVSS 10.0): An out-of-bounds write issue was addressed with improved checks to prevent unauthorized actions. This issue is fixed in…
CVE-2025-24085 — Critical (CVSS 10.0): A use after free issue was addressed with improved memory management. This issue is fixed in iOS 18.3 and iPadOS 18.3,…
CVE-2022-32845 — Critical (CVSS 10.0): This issue was addressed with improved checks. This issue is fixed in watchOS 8.7, iOS 15.6 and iPadOS 15.6, macOS…
CVE-2019-8779 — Critical (CVSS 10.0): A logic issue applied the incorrect restrictions. This issue was addressed by updating the logic to apply the correct…
CVE-2018-4310 — Critical (CVSS 10.0): An access issue was addressed with additional sandbox restrictions. This issue affected versions prior to iOS 12, macOS…

All CVEs affecting Apple Iphone Os →

Other CWE-79 (Cross-site Scripting (XSS)) vulnerabilities

CVE-2025-49410 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Imran Emu TC…
CVE-2024-47875 — Critical (CVSS 10.0): DOMPurify is a DOM-only, super-fast, uber-tolerant XSS sanitizer for HTML, MathML and SVG. DOMpurify was vulnerable to…
CVE-2024-6886 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Gitea…
CVE-2023-45144 — Critical (CVSS 10.0): com.xwiki.identity-oauth:identity-oauth-ui is a package to aid in building identity and service providers based on…
CVE-2023-45138 — Critical (CVSS 10.0): Change Request is an pplication allowing users to request changes on a wiki without publishing the changes directly.…
CVE-2022-4361 — Critical (CVSS 10.0): Keycloak, an open-source identity and access management solution, has a cross-site scripting (XSS) vulnerability in the…

Browse all CWE-79 (Cross-site Scripting (XSS)) vulnerabilities →