{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-27902", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-02-24T15:19:29.718Z", "datePublished": "2026-02-26T00:58:54.604Z", "dateUpdated": "2026-02-26T18:51:39.142Z"}, "containers": {"cna": {"title": "Svelte Vulnerable to XSS via HTML Comment Injection in SSR Error Boundary Hydration Markers", "problemTypes": [{"descriptions": [{"cweId": "CWE-79", "lang": "en", "description": "CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')", "type": "CWE"}]}], "metrics": [{"cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "HIGH", "subIntegrityImpact": "HIGH", "subAvailabilityImpact": "NONE", "baseScore": 5.3, "baseSeverity": "MEDIUM", "vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:L/VI:N/VA:N/SC:H/SI:H/SA:N", "version": "4.0"}}], "references": [{"name": "https://github.com/sveltejs/svelte/security/advisories/GHSA-qgvg-pr8v-6rr3", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/sveltejs/svelte/security/advisories/GHSA-qgvg-pr8v-6rr3"}, {"name": "https://github.com/sveltejs/svelte/commit/0298e979371bb583855c9810db79a70a551d22b9", "tags": ["x_refsource_MISC"], "url": "https://github.com/sveltejs/svelte/commit/0298e979371bb583855c9810db79a70a551d22b9"}, {"name": "https://github.com/sveltejs/svelte/releases/tag/svelte%405.53.5", "tags": ["x_refsource_MISC"], "url": "https://github.com/sveltejs/svelte/releases/tag/svelte%405.53.5"}], "affected": [{"vendor": "sveltejs", "product": "svelte", "versions": [{"version": ">= 5.53.0, < 5.53.5", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-02-26T00:58:54.604Z"}, "descriptions": [{"lang": "en", "value": "Svelte performance oriented web framework. Prior to version 5.53.5, errors from `transformError` were not correctly escaped prior to being embedded in the HTML output, causing potential HTML injection and XSS if attacker-controlled content is returned from `transformError`. Version 5.53.5 fixes the issue."}], "source": {"advisory": "GHSA-qgvg-pr8v-6rr3", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-02-26T18:51:28.889254Z", "id": "CVE-2026-27902", "options": [{"Exploitation": "none"}, {"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": "2026-02-26T18:51:39.142Z"}}]}}

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{"bugzilla": {"description": "svelte: Svelte: Cross-Site Scripting via unsanitized error output", "id": "2442917", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2442917"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.2", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N", "status": "draft"}, "cwe": "CWE-79", "details": ["Svelte performance oriented web framework. Prior to version 5.53.5, errors from `transformError` were not correctly escaped prior to being embedded in the HTML output, causing potential HTML injection and XSS if attacker-controlled content is returned from `transformError`. Version 5.53.5 fixes the issue.", "A cross-site scripting (XSS) vulnerability was found in Svelte\u2019s server-side rendering (SSR) error handling. Error messages returned from the transformError function were not properly escaped before being embedded into HTML output within hydration markers. If an application returns attacker-controlled content through transformError, the content may be interpreted as HTML in the rendered page, resulting in HTML injection and potential execution of arbitrary JavaScript in a victim\u2019s browser. Successful exploitation could allow an attacker to access sensitive information or perform actions in the context of the affected user."], "name": "CVE-2026-27902", "package_state": [{"cpe": "cpe:/a:redhat:podman_desktop:0", "fix_state": "Fix deferred", "package_name": "rhdesktop/rh-podman-desktop-ext-bootc-rhel10", "product_name": "Red Hat Build of Podman Desktop - Tech Preview"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Out of support scope", "package_name": "rhoai/odh-dashboard-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}], "public_date": "2026-02-26T00:58:54Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-27902\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-27902\nhttps://github.com/sveltejs/svelte/commit/0298e979371bb583855c9810db79a70a551d22b9\nhttps://github.com/sveltejs/svelte/releases/tag/svelte%405.53.5\nhttps://github.com/sveltejs/svelte/security/advisories/GHSA-qgvg-pr8v-6rr3"], "statement": "This MODERATE severity cross-site scripting (XSS) flaw in Svelte's server-side rendering (SSR) error handling allows for HTML injection. If an application utilizing Svelte's SSR returns attacker-controlled content through the `transformError` function, it could lead to the execution of arbitrary JavaScript in a victim's browser. This only affects applications or packages that embed or utilize Svelte in a server-side rendering context.", "threat_severity": "Moderate"}

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