Improperly Implemented Security Check for Standard Affecting chromium package, versions [,95.0.4638.54)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UNMANAGED-CHROMIUM-15357615
- published26 Feb 2026
- disclosed24 Feb 2026
- creditMatt Dyas, Ankur Sundara
Introduced: 24 Feb 2026
CVE-2021-37989 (opens in a new tab)How to fix?
Upgrade chromium to version 95.0.4638.54 or higher.
Overview
Affected versions of this package are vulnerable to Improperly Implemented Security Check for Standard via the HTMLIFrameElement::ParseAttribute handling of csp attributes in Blink’s renderer core. An attacker can bypass the iframe’s declared CSP and execute disallowed content by delivering a crafted HTML page whose iframe csp attribute exceeds 4096 bytes, causing Blink to ignore the policy.