{"answers":{"affected":"2 open source packages ship an affected version, including svelte. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-27902 in the wild and no public exploit code.","fix":"Upgrade svelte to 5.53.5 or later.","what":"CVE-2026-27902 is a medium-severity cross-site scripting vulnerability in sveltejs svelte, published on 26 Feb 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2026-27902 and fix it if it is affected.\n\nWhat it is: CVE-2026-27902 is a medium-severity cross-site scripting vulnerability in sveltejs svelte, published on 26 Feb 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2026-27902 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- svelte (npm): affected from 5.53.0; fixed in 5.53.5\n- svelte (npm): affected from 5.53.0; fixed in 5.53.5\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-27902/ (Markdown: https://insights.sbomify.com/CVE-2026-27902/index.md)","id":"CVE-2026-27902","markdown":"https://insights.sbomify.com/CVE-2026-27902/index.md","name":"CVE-2026-27902","record":{"aliases":["GHSA-qgvg-pr8v-6rr3"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"Svelte web framework","requires_auth":"none","summary":"Attackers can inject malicious scripts via unescaped error messages in Svelte SSR hydration markers, leading to XSS.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"svelte","vendor":"svelte"}],"cvss":{"score":5.3,"severity":"medium","source":"cna","vector":"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"},"cwes":[{"id":"CWE-79","name":"Improper Neutralization of Input During Web Page Generation"}],"description":"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.","ecosystems":["npm"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Svelte Vulnerable to XSS via HTML Comment Injection in SSR Error Boundary Hydration Markers","id":"CVE-2026-27902","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":"xss","year":"2026"},"n_packages":2,"n_references":3,"next":{"headline":"minimatch has a ReDoS: matchOne() combinatorial backtracking via multiple non-adjacent GLOBSTAR segments","id":"CVE-2026-27903"},"packages":[{"ecosystem":"npm","fixed":["5.53.5"],"introduced":["5.53.0"],"last_affected":[],"package":"svelte","purl":null,"source":"GHSA-qgvg-pr8v-6rr3"},{"ecosystem":"npm","fixed":["5.53.5"],"introduced":["5.53.0"],"last_affected":[],"package":"svelte","purl":"pkg:npm/svelte","source":"GHSA-qgvg-pr8v-6rr3"}],"prev":{"headline":"Svelte vulnerable to XSS during SSR with contenteditable `bind:innerText` and `bind:textContent`","id":"CVE-2026-27901"},"products":["svelte"],"published":"2026-02-26","related":[{"cvss_score":7.8,"headline":"Code injection in n/a","id":"CVE-2021-29261","kev_date_added":null,"published":"2021-04-05"},{"cvss_score":5.9,"headline":"Svelte: ReDoS in `\u003csvelte:element\u003e` Tag Validation","id":"CVE-2026-42567","kev_date_added":null,"published":"2026-06-09"},{"cvss_score":5.4,"headline":"Potential mXSS vulnerability due to improper HTML escaping in svelte","id":"CVE-2024-45047","kev_date_added":null,"published":"2024-08-30"},{"cvss_score":5.4,"headline":"Cross-site Scripting (XSS)","id":"CVE-2022-25875","kev_date_added":null,"published":"2022-07-12"},{"cvss_score":5.3,"headline":"Svelte: XSS via DOM Clobbering of Internal Framework State","id":"CVE-2026-42573","kev_date_added":null,"published":"2026-06-09"},{"cvss_score":5.3,"headline":"Svelte vulnerable to XSS during SSR with contenteditable `bind:innerText` and `bind:textContent`","id":"CVE-2026-27901","kev_date_added":null,"published":"2026-02-26"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-02-26","vendors":["sveltejs"]},"summary":"Attackers can inject malicious scripts via unescaped error messages in Svelte SSR hydration markers, leading to XSS.","url":"https://insights.sbomify.com/CVE-2026-27902/"}