Live › vulnerability › CVE-2021-1879
Go to dashboardA WebKit flaw in Apple iOS, iPadOS and watchOS lets crafted web content run script in pages it should not reach. Attackers can use it to read data and act as the user in other sites, and CISA lists it as actively exploited.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 19:11 UTC, 3h before NVD. All times on this page are UTC.
Apply updates per vendor instructions.
| Product | Ecosystem | Affected | Fixed in |
|---|---|---|---|
| Apple iOS, iPadOS, and watchOS | vendor | – | – |
Settings > General > About on each iPhone, iPad or Apple Watch and compare the version with Apple's patched release notes
Update iOS, iPadOS and watchOS to a release that includes the fix, per Apple's security release notes for CVE-2021-1879 Apps that embed WebKit (non-Safari browsers and in-app web views) also need their own updates
Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
Apple iOS, iPadOS, and watchOS WebKit contain an unspecified vulnerability that allows for universal cross-site scripting (XSS) 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.
CISA required action: Apply updates per vendor instructions.
This page as .md · .json · in your agent: get_signal("CVE-2021-1879")
CISA KEV catalog, Creative Commons 0 · EPSS scores by FIRST, used with attribution · NVD data is provided by NIST and is public domain. Posts quoted belong to their authors.