{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-42451 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-42451 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-42451 is a medium-severity cross-site scripting vulnerability in grimmory-tools grimmory, published on 8 May 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2026-42451 and fix it if it is affected.\n\nWhat it is: CVE-2026-42451 is a medium-severity cross-site scripting vulnerability in grimmory-tools grimmory, published on 8 May 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2026-42451 in the wild and no public exploit code.\n\nAffected product: grimmory-tools grimmory. No package-level version data is available, so check the vendor advisory linked from the reference page.\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-2026-42451/ (Markdown: https://insights.sbomify.com/CVE-2026-42451/index.md)","id":"CVE-2026-42451","markdown":"https://insights.sbomify.com/CVE-2026-42451/index.md","name":"CVE-2026-42451","record":{"aliases":["GHSA-frv6-5wq5-9p24"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["account_takeover","data_read"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Self-hosted digital library","requires_auth":"low_privilege","summary":"Attackers can steal session tokens and take over accounts, including admin access, by tricking users into opening malicious EPUB files in the Grimmory reader.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":6.3,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:L","version":"3.1"},"cwes":[{"id":"CWE-80","name":"Improper Neutralization of Script-Related HTML Tags in a Web Page"},{"id":"CWE-79","name":"Improper Neutralization of Input During Web Page Generation"}],"description":"Grimmory is a self-hosted digital library. Prior to version 2.3.1, a stored cross-site scripting (XSS) vulnerability in Grimmory's browser-based EPUB reader allows an attacker to embed arbitrary JavaScript in a crafted EPUB file. When a victim opens the book, the script executes in their browser with full access to the Grimmory application's session context. This can enable session token theft and account takeover, including administrative access if an administrator opens the affected book. This issue has been patched in version 2.3.1.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":false,"headline":"Grimmory: Stored XSS via Malicious EPUB Enables Session Token Theft","id":"CVE-2026-42451","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"xss","year":"2026"},"n_packages":0,"n_references":2,"next":{"headline":"Termix: Pending-TOTP temporary token can regenerate backup codes and neutralize TOTP","id":"CVE-2026-42452"},"packages":[],"prev":{"headline":"OpenColorIO vulnerable to stack buffer overflow via unbounded `sscanf %s` in Spi3D (.spi3d) LUT parser","id":"CVE-2026-42450"},"products":["grimmory"],"published":"2026-05-08","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"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":"total"},"state":"PUBLISHED","updated":"2026-05-12","vendors":["grimmory-tools"]},"summary":"Attackers can steal session tokens and take over accounts, including admin access, by tricking users into opening malicious EPUB files in the Grimmory reader.","url":"https://insights.sbomify.com/CVE-2026-42451/"}