{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-15265","assignerOrgId":"84fe0718-d6bb-4716-a7e8-81a6d1daa869","state":"PUBLISHED","assignerShortName":"Fluid Attacks","dateReserved":"2025-12-29T15:31:42.980Z","datePublished":"2026-01-15T19:59:41.683Z","dateUpdated":"2026-01-15T20:28:16.479Z"},"containers":{"cna":{"affected":[{"collectionURL":"https://registry.npmjs.org","defaultStatus":"unaffected","packageName":"svelte","platforms":["Windows","Linux","MacOS"],"product":"Svelte","vendor":"Svelte","versions":[{"lessThan":"5.46.3","status":"affected","version":"5.46.0","versionType":"custom"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:a:svelte:svelte:*:*:windows:*:*:*:*:*","versionEndExcluding":"5.46.3","versionStartIncluding":"5.46.0","vulnerable":true},{"criteria":"cpe:2.3:a:svelte:svelte:*:*:linux:*:*:*:*:*","versionEndExcluding":"5.46.3","versionStartIncluding":"5.46.0","vulnerable":true},{"criteria":"cpe:2.3:a:svelte:svelte:*:*:macos:*:*:*:*:*","versionEndExcluding":"5.46.3","versionStartIncluding":"5.46.0","vulnerable":true}],"negate":false,"operator":"OR"}],"operator":"OR"}],"credits":[{"lang":"en","type":"finder","value":"Camilo Vera"}],"descriptions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"<span style=\"background-color: rgb(255, 255, 255);\">An SSR XSS exists in async hydration when attacker‑controlled keys are passed to hydratable. The key is embedded inside a &lt;script&gt; block without HTML‑safe escaping, allowing &lt;/script&gt; to terminate the script and inject arbitrary JavaScript. This enables remote script execution in users' browsers, with potential for session theft and account compromise.</span><br><p>This issue affects Svelte: from 5.46.0 before 5.46.3.</p>"}],"value":"An SSR XSS exists in async hydration when attacker‑controlled keys are passed to hydratable. The key is embedded inside a <script> block without HTML‑safe escaping, allowing </script> to terminate the script and inject arbitrary JavaScript. This enables remote script execution in users' browsers, with potential for session theft and account compromise.\nThis issue affects Svelte: from 5.46.0 before 5.46.3."}],"impacts":[{"capecId":"CAPEC-63","descriptions":[{"lang":"en","value":"CAPEC-63 Cross-Site Scripting (XSS)"}]}],"metrics":[{"cvssV4_0":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":5.3,"baseSeverity":"MEDIUM","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"LOW","subIntegrityImpact":"LOW","userInteraction":"PASSIVE","valueDensity":"NOT_DEFINED","vectorString":"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","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnerabilityResponseEffort":"NOT_DEFINED"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-79","description":"CWE-79 Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting')","lang":"en","type":"CWE"}]}],"providerMetadata":{"orgId":"84fe0718-d6bb-4716-a7e8-81a6d1daa869","shortName":"Fluid Attacks","dateUpdated":"2026-01-15T19:59:41.683Z"},"references":[{"tags":["third-party-advisory"],"url":"https://fluidattacks.com/advisories/lydian"},{"tags":["vendor-advisory"],"url":"https://github.com/sveltejs/svelte/security/advisories/GHSA-6738-r8g5-qwp3"},{"tags":["patch"],"url":"https://fluidattacks.com/advisories/lydian"}],"source":{"discovery":"UNKNOWN"},"title":"Svelte 5.46.0  - Hydratable Key Script-Breakout XSS (SSR)","x_generator":{"engine":"Vulnogram 0.2.0"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-01-15T20:28:05.329081Z","id":"CVE-2025-15265","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-01-15T20:28:16.479Z"}}]}}