{"answers":{"affected":"","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-10821 exists.","fix":"No fix has been published for CVE-2026-10821 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-10821 is a medium-severity code injection vulnerability in Unknown Yoast SEO Premium, published on 2 Sep 2026. An attacker needs administrator access to exploit it, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-10821 and fix it if it is affected.\n\nWhat it is: CVE-2026-10821 is a medium-severity code injection vulnerability in Unknown Yoast SEO Premium, published on 2 Sep 2026. An attacker needs administrator access to exploit it, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-10821 exists.\n\nAffected product: Unknown Yoast SEO Premium. 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-2026-10821/ (Markdown: https://insights.sbomify.com/CVE-2026-10821/index.md)","id":"CVE-2026-10821","markdown":"https://insights.sbomify.com/CVE-2026-10821/index.md","name":"CVE-2026-10821","record":{"aliases":["GHSA-2r8j-r49x-m28r"],"analysis":{"component_type":"cms_plugin","fix_type":"upgrade","impacts":["code_execution"],"network_reachable":"yes","non_default_config":true,"product_category":"WordPress plugin","requires_auth":"high_privilege","summary":"Authors can inject Apache directives into .htaccess to achieve remote code execution via chained media uploads in Yoast SEO Premium.","user_interaction":"not_required","vuln_class":"code_injection"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"WPScan","cpe":[],"cvss":{"score":6.6,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-74","name":"Improper Neutralization of Special Elements in Output Used by a Downstream Component"}],"description":"The Yoast SEO Premium WordPress plugin before 27.6.1 does not sanitize control characters from redirect origins before writing them to the site's Apache configuration file when the file-based redirect mode is enabled, and the redirect-creation endpoint is reachable by users with only Author-level access. This allows such users to inject arbitrary newline-delimited Apache directives into the root .htaccess file. On Apache servers that honour PHP directives, the injection can be chained with the user's own media upload (a polyglot image carrying a PHP payload) and an auto_prepend_file directive to achieve Remote Code Execution.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":null,"headline":"Yoast SEO Premium \u003c 27.6.1 - Author+ Arbitrary .htaccess Directive Injection to RCE","id":"CVE-2026-10821","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"code_injection","year":"2026"},"n_packages":0,"n_references":2,"next":{"headline":"Key Record using PRIVATEDNS algorithm may lead to unexpected exit","id":"CVE-2026-10822"},"packages":[],"prev":{"headline":"ProfilePress \u003c 4.16.17 - Subscriber+ Subscription Cancellation via IDOR","id":"CVE-2026-10820"},"products":["Yoast SEO Premium"],"published":"2026-09-02","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":"poc","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-09-02","vendors":["Unknown"]},"summary":"Authors can inject Apache directives into .htaccess to achieve remote code execution via chained media uploads in Yoast SEO Premium.","url":"https://insights.sbomify.com/CVE-2026-10821/"}