{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-4658 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-4658 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-4658 is a medium-severity cross-site scripting vulnerability in wpdevteam Gutenberg Essential Blocks – Page Builder for Gutenberg Blocks \u0026 Patterns, published on 2 May 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-4658 and fix it if it is affected.\n\nWhat it is: CVE-2026-4658 is a medium-severity cross-site scripting vulnerability in wpdevteam Gutenberg Essential Blocks – Page Builder for Gutenberg Blocks \u0026 Patterns, published on 2 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-4658 in the wild and no public exploit code.\n\nAffected product: wpdevteam Gutenberg Essential Blocks – Page Builder for Gutenberg Blocks \u0026 Patterns. 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-2026-4658/ (Markdown: https://insights.sbomify.com/CVE-2026-4658/index.md)","id":"CVE-2026-4658","markdown":"https://insights.sbomify.com/CVE-2026-4658/index.md","name":"CVE-2026-4658","record":{"aliases":["GHSA-5vvh-659m-gjm3"],"analysis":{"component_type":"cms_plugin","fix_type":"upgrade","impacts":["code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"WordPress plugin","requires_auth":"low_privilege","summary":"Authenticated attackers with Contributor access can inject arbitrary scripts via block attributes, leading to stored XSS execution on victim pages.","user_interaction":"not_required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Wordfence","cpe":[],"cvss":{"score":6.4,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-79","name":"Improper Neutralization of Input During Web Page Generation"}],"description":"The Essential Blocks – Page Builder Gutenberg Blocks, Patterns \u0026 Templates plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the className, classHook, and blockId attributes in the Add to Cart block (essential-blocks/add-to-cart) in all versions up to, and including, 6.0.4. This is due to insufficient output escaping in the render_callback() function where these attributes are placed into class and data-id HTML attributes using raw sprintf() and implode() without esc_attr() escaping. While the outer wrapper div uses get_block_wrapper_attributes() which properly escapes, the inner divs do not. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":null,"headline":"Gutenberg Essential Blocks \u003c= 6.0.4 - Authenticated (Contributor+) Stored Cross-Site Scripting via Block Attributes","id":"CVE-2026-4658","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"xss","year":"2026"},"n_packages":0,"n_references":10,"next":{"headline":"Path traversal in Unlimited Elements For Elementor","id":"CVE-2026-4659"},"packages":[],"prev":{"headline":"Easy Google Fonts \u003c= 2.0.4 - Authenticated (Author+) Stored Cross-Site Scripting via control_selectors Meta Field","id":"CVE-2026-4657"},"products":["Gutenberg Essential Blocks – Page Builder for Gutenberg Blocks \u0026 Patterns"],"published":"2026-05-02","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":"partial"},"state":"PUBLISHED","updated":"2026-05-04","vendors":["wpdevteam"]},"summary":"Authenticated attackers with Contributor access can inject arbitrary scripts via block attributes, leading to stored XSS execution on victim pages.","url":"https://insights.sbomify.com/CVE-2026-4658/"}