{"id":"GHSA-hh8m-fm6v-7cvg","summary":"Angular: Sanitization bypass via directive host bindings on concrete host elements in @angular/core and @angular/compiler","details":"Angular automatically sanitizes untrusted values bound to security-sensitive DOM sinks (such as `href`, `src`, `action`, `xlink:href`, and `data`) to protect against Cross-Site Scripting (XSS).\n\nPrior to the fix, the Angular compiler determined the `SecurityContext` for directive host bindings (`host: {'[attr.href]': 'value'}` or `@HostBinding('attr.href')`) based solely on the declaring directive or component selector at compile time, rather than the concrete host element that the directive was applied to.\n\nWhen a directive with a security-sensitive host binding was applied to a different concrete host element—such as through:\n- `hostDirectives` composition,\n- Class inheritance of host bindings,\n- Dynamic component instantiation (`createComponent` with custom `hostElement` or dynamic directives),\n- Elements with SVG/MathML namespaces (e.g. `\u003csvg:a\u003e`, `\u003cmath\u003e`), or\n- Elements using tag-neutral selectors (e.g. `:not(...)`),\n\nthe compiler either failed to associate a sanitizer with the host binding or attached an incorrect security context. As a result, untrusted inputs (e.g. `javascript:...` URLs) bound via the host binding would be written to the DOM attribute without passing through Angular's built-in sanitizer.\n\n### Impact\nAn attacker capable of controlling the value bound to an affected directive host binding could execute arbitrary JavaScript in the user's browser context (Cross-Site Scripting).\n\n### Patches\nThis issue has been resolved in versions:\n- `22.1.0` \n- `21.2.20`\n- `20.3.28`\n\n### Workarounds\nEnsure that any user-controlled values assigned to properties bound via directive host bindings are explicitly sanitized using `DomSanitizer.sanitize(SecurityContext.URL, ...)` before assignment, or restrict the input to validated safe URL schemes (e.g. `http://`, `https://`).","aliases":["CVE-2026-88057"],"modified":"2026-09-10T20:41:03.081979Z","published":"2026-09-10T20:18:02Z","database_specific":{"cwe_ids":["CWE-79"],"severity":"MODERATE","github_reviewed":true,"github_reviewed_at":"2026-09-10T20:18:02Z","nvd_published_at":null},"references":[{"type":"WEB","url":"https://github.com/angular/angular/security/advisories/GHSA-hh8m-fm6v-7cvg"},{"type":"WEB","url":"https://github.com/angular/angular/issues/69550"},{"type":"WEB","url":"https://github.com/angular/angular/pull/69558"},{"type":"WEB","url":"https://github.com/angular/angular/commit/2f96c8020f85ccb715a76de4b79a0c680c2c7264"},{"type":"WEB","url":"https://github.com/angular/angular/commit/6afe6fa781c2f0931f0aedd729b9884a8fe212ee"},{"type":"WEB","url":"https://github.com/angular/angular/commit/6caa298dee58319b2d674dc91364e26ffe3ecb2b"},{"type":"PACKAGE","url":"https://github.com/angular/angular"},{"type":"WEB","url":"https://github.com/angular/angular/releases/tag/v20.3.28"},{"type":"WEB","url":"https://github.com/angular/angular/releases/tag/v21.2.20"},{"type":"WEB","url":"https://github.com/angular/angular/releases/tag/v22.1.0"}],"affected":[{"package":{"name":"@angular/core","ecosystem":"npm","purl":"pkg:npm/%40angular/core"},"ranges":[{"type":"SEMVER","events":[{"introduced":"22.0.0"},{"fixed":"22.1.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-hh8m-fm6v-7cvg/GHSA-hh8m-fm6v-7cvg.json"}},{"package":{"name":"@angular/compiler","ecosystem":"npm","purl":"pkg:npm/%40angular/compiler"},"ranges":[{"type":"SEMVER","events":[{"introduced":"22.0.0"},{"fixed":"22.1.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-hh8m-fm6v-7cvg/GHSA-hh8m-fm6v-7cvg.json"}},{"package":{"name":"@angular/core","ecosystem":"npm","purl":"pkg:npm/%40angular/core"},"ranges":[{"type":"SEMVER","events":[{"introduced":"21.0.0"},{"fixed":"21.2.20"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-hh8m-fm6v-7cvg/GHSA-hh8m-fm6v-7cvg.json"}},{"package":{"name":"@angular/compiler","ecosystem":"npm","purl":"pkg:npm/%40angular/compiler"},"ranges":[{"type":"SEMVER","events":[{"introduced":"21.0.0"},{"fixed":"21.2.20"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-hh8m-fm6v-7cvg/GHSA-hh8m-fm6v-7cvg.json"}},{"package":{"name":"@angular/core","ecosystem":"npm","purl":"pkg:npm/%40angular/core"},"ranges":[{"type":"SEMVER","events":[{"introduced":"20.0.0"},{"fixed":"20.3.28"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-hh8m-fm6v-7cvg/GHSA-hh8m-fm6v-7cvg.json"}},{"package":{"name":"@angular/compiler","ecosystem":"npm","purl":"pkg:npm/%40angular/compiler"},"ranges":[{"type":"SEMVER","events":[{"introduced":"20.0.0"},{"fixed":"20.3.28"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-hh8m-fm6v-7cvg/GHSA-hh8m-fm6v-7cvg.json"}},{"package":{"name":"@angular/core","ecosystem":"npm","purl":"pkg:npm/%40angular/core"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"last_affected":"19.2.25"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-hh8m-fm6v-7cvg/GHSA-hh8m-fm6v-7cvg.json"}},{"package":{"name":"@angular/compiler","ecosystem":"npm","purl":"pkg:npm/%40angular/compiler"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"last_affected":"19.2.25"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-hh8m-fm6v-7cvg/GHSA-hh8m-fm6v-7cvg.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N"}]}