{"answers":{"affected":"2 open source packages ship an affected version, including getgrav/grav.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-58657 exists.","fix":"Upgrade getgrav/grav to 2.0.0 or later.","what":"CVE-2026-58657 is a medium-severity cross-site scripting vulnerability in Grav, published on 8 Jul 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2026-58657 and fix it if it is affected.\n\nWhat it is: CVE-2026-58657 is a medium-severity cross-site scripting vulnerability in Grav, published on 8 Jul 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-58657 exists.\n\nAffected packages and fixed versions:\n- getgrav/grav (Packagist): affected from 2.0.0-rc.9; fixed in 2.0.0\n- getgrav/grav (Packagist): affected from 2.0.0-rc.9; fixed in 2.0.0\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-2026-58657/ (Markdown: https://insights.sbomify.com/CVE-2026-58657/index.md)","id":"CVE-2026-58657","markdown":"https://insights.sbomify.com/CVE-2026-58657/index.md","name":"CVE-2026-58657","record":{"aliases":["GHSA-ffmg-hfvg-jhg9"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["security_bypass","data_modify"],"network_reachable":"yes","non_default_config":false,"product_category":"Grav CMS","requires_auth":"high_privilege","summary":"A lower-privileged editor can inject CSS via Markdown image resize parameters, enabling UI redress attacks against higher-privileged users viewing the page.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[],"cvss":{"score":4.8,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N","version":"4.0"},"cwes":[{"id":"CWE-79","name":"Improper Neutralization of Input During Web Page Generation"}],"description":"Grav before 2.0.0 (affected through 2.0.0-rc.9 and the 2.0 branch) contains a stored CSS injection vulnerability in the Markdown image resize() media action. Prior media hardening rejects direct ?style= payloads and unsafe attribute() fallbacks, but the resize() action in Excerpts::processMediaActions() writes caller-controlled values directly into the image's styleAttributes. A lower-privileged content editor who can edit page Markdown can store a crafted image URL with semicolon-delimited CSS declarations in the resize parameters, which are rendered into the final \u003cimg style=...\u003e attribute when a higher-privileged reviewer/admin views the page or preview. This does not require JavaScript execution but enables UI redress/overlay and content-manipulation attacks (e.g., a full-viewport fixed overlay). Fixed in 2.0.0.","ecosystems":["Packagist"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"Grav - Stored CSS Injection via Markdown Image resize() Action","id":"CVE-2026-58657","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Packagist","product":null,"products":[],"type":"xss","year":"2026"},"n_packages":2,"n_references":4,"next":{"headline":"GPUStack Unauthenticated Information Disclosure via Worker Endpoints","id":"CVE-2026-58658"},"packages":[{"ecosystem":"Packagist","fixed":["2.0.0"],"introduced":["2.0.0-rc.9"],"last_affected":[],"package":"getgrav/grav","purl":null,"source":"GHSA-ffmg-hfvg-jhg9"},{"ecosystem":"Packagist","fixed":["2.0.0"],"introduced":["2.0.0-rc.9"],"last_affected":[],"package":"getgrav/grav","purl":"pkg:composer/getgrav/grav","source":"GHSA-ffmg-hfvg-jhg9"}],"prev":{"headline":"Grav API Plugin - Cross-Origin Admin Account Takeover via CORS Wildcard and JWT Query Parameter","id":"CVE-2026-58656"},"products":["Grav"],"published":"2026-07-08","related":[],"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":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-10-08","vendors":["Grav"]},"summary":"A lower-privileged editor can inject CSS via Markdown image resize parameters, enabling UI redress attacks against higher-privileged users viewing the page.","url":"https://insights.sbomify.com/CVE-2026-58657/"}