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Findings

CVE-2026-27122

svelte performance oriented web framework.

Published Feb 20, 2026 · updated Jun 17, 2026 · svelte svelte

svelte performance oriented web framework. Prior to 5.51.5, when using in server-side rendering, the provided tag name is not validated or sanitized before being emitted into the HTML output. If the tag string contains unexpected characters, it can result in HTML injection in the SSR output. Client-side rendering is not affected. This vulnerability is fixed in 5.51.5.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Feb 20, 2026 · NIST NVD

    Detected

    svelte performance oriented web framework. Prior to 5.51.5, when using in server-side rendering, the provided tag name is not validated or sanitized before being emitted into the HTML output. If the tag string contains unexpected characters, it can result in HTML injection in the SSR output. Client-side rendering is not affected. This vulnerability is fixed in 5.51.5.

  2. Jun 17, 2026 · NIST NVD

    Updated

    svelte performance oriented web framework. Prior to 5.51.5, when using in server-side rendering, the provided tag name is not validated or sanitized before being emitted into the HTML output. If the tag string contains unexpected characters, it can result in HTML injection in the SSR output. Client-side rendering is not affected. This vulnerability is fixed in 5.51.5.

Affected

  • cpe svelte/svelteversion unspecified

Sources

  • CVE.orgVulnerability recordCVE-2026-27122

    Official CVE identifier

    cve.org
  • NIST NVDVulnerability recordCVE-2026-27122

    svelte performance oriented web framework. Prior to 5.51.5, when using in server-side rendering, the provided tag name is not validated or sanitized before being emitted into the HTML output. If the tag string contains unexpected characters, it can res

    nvd.nist.gov

References