--- title: CVE-2026-27886: Unauthenticated Boolean-Oracle… | daily.dev description: Bishop Fox details CVE-2026-27886, a critical unauthenticated sanitization bypass in Strapi versions 4.0.0 through 5.36.1. An attacker can abuse an... canonical: https://daily.dev/posts/cve-2026-27886-unauthenticated-boolean-oracle--5yimqyzoy twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: CVE-2026-27886: Unauthenticated Boolean-Oracle… | daily.dev og:description: Bishop Fox details CVE-2026-27886, a critical unauthenticated sanitization bypass in Strapi versions 4.0.0 through 5.36.1. An attacker can abuse an... og:url: https://daily.dev/posts/cve-2026-27886-unauthenticated-boolean-oracle--5yimqyzoy og:image: https://api.daily.dev/og/posts/5yiMQyZOy.png og:image:alt: CVE-2026-27886: Unauthenticated Boolean-Oracle… og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # CVE-2026-27886: Unauthenticated Boolean-Oracle… **[Sliver C2 Documentation](https://daily.dev/sources/bishopfox)** · 19 min read · 0 upvotes · 0 comments ## Summary Bishop Fox details CVE-2026-27886, a critical unauthenticated sanitization bypass in Strapi versions 4.0.0 through 5.36.1. An attacker can abuse an undocumented `where` query parameter to reach the database layer directly, turning the pagination total into a boolean oracle that leaks an administrator's password-reset token or email character by character. Combined with Strapi's existing forgot-password and reset-password endpoints, this allows full unauthenticated account takeover with a Super Admin JWT. Strapi shipped a fix in 5.37.0 (Feb 26, 2026) that adds a strict allowlist of permitted query keys; the advisory (CVSS 9.3) was published May 13, 2026. Bishop Fox also released a Python detection tool to check for vulnerable instances without performing full takeover. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### What is CVE-2026-27886 in Strapi and how does it lead to account takeover? CVE-2026-27886 is a critical unauthenticated sanitization bypass affecting Strapi 4.0.0 through 5.36.1, rated CVSS 9.3. An attacker sends a crafted query with an undocumented `where` parameter that reaches the database layer unsanitized, turning the response's pagination total into a one-bit oracle. This leaks an admin's 40-character password-reset token or email character by character, which is then submitted to Strapi's own reset-password endpoint to obtain a Super Admin JWT. _daily.dev surfaces critical CVEs like this so teams patching Strapi don't miss the details._ ### How do I fix or mitigate the Strapi where-clause query bypass vulnerability? Upgrade to Strapi 5.37.0 or later, which introduces an explicit allowlist of permitted Content API query keys (filters, sort, fields, populate, pagination, etc.) enforced via a new strictParams option in validateQuery and sanitizeQuery. Administrators on affected versions should also rotate every admin password, clear outstanding reset_password_token values, and review which content types the Public role can list. _Track framework security patches like this on daily.dev before they turn into a production incident._ ### What preconditions does an attacker need to exploit the Strapi CVE-2026-27886 boolean oracle? Two conditions must hold: the Public role must have the find action granted on at least one content type (common on public-facing installs whose frontend reads content unauthenticated), and at least one row in that table must have a non-NULL updatedBy or createdBy foreign key pointing to an admin_users row, which happens automatically whenever an admin edits content through the admin UI. _Developers auditing Strapi permissions can follow disclosures like this via daily.dev._ ## Similar posts on daily.dev - [CVE-2026-82329: Unauthenticated Administrative Access in…](https://daily.dev/posts/cve-2026-82329-unauthenticated-administrative-access-in--jp5ers0bt) · Sliver C2 Documentation · 0 upvotes · 0 comments - [CVE-2026-22589 \(spree\_core\): Spree API has Unauthenticated IDOR](https://daily.dev/posts/cve-2026-22589-spree-core-spree-api-has-unauthenticated-idor-olszibwc5) · RUBYLAND · 0 upvotes · 0 comments - [From Bug to Schema: Exploring Error-Based SQL Injection on an Authenticating Portal](https://daily.dev/posts/from-bug-to-schema-exploring-error-based-sql-injection-on-an-authenticating-portal-xbvfkmcgs) · InfoSec Write-ups · 0 upvotes · 0 comments --- Tags: [#security](https://daily.dev/tags/security), [#authentication](https://daily.dev/tags/authentication), [#sql](https://daily.dev/tags/sql), [#vulnerability](https://daily.dev/tags/vulnerability) [View this post on daily.dev](https://daily.dev/posts/cve-2026-27886-unauthenticated-boolean-oracle--5yimqyzoy) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"CVE-2026-27886: Unauthenticated Boolean-Oracle…","url":"https://daily.dev/posts/cve-2026-27886-unauthenticated-boolean-oracle--5yimqyzoy","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/cve-2026-27886-unauthenticated-boolean-oracle--5yimqyzoy"},"datePublished":"2026-08-23T12:21:40.348Z","dateModified":"2026-08-23T12:39:07.962Z","description":"Bishop Fox details CVE-2026-27886, a critical unauthenticated sanitization bypass in Strapi versions 4.0.0 through 5.36.1. 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Administrators on affected versions should also rotate every admin password, clear outstanding reset_password_token values, and review which content types the Public role can list. Track framework security patches like this on daily.dev before they turn into a production incident."}},{"@type":"Question","name":"What preconditions does an attacker need to exploit the Strapi CVE-2026-27886 boolean oracle?","acceptedAnswer":{"@type":"Answer","text":"Two conditions must hold: the Public role must have the find action granted on at least one content type (common on public-facing installs whose frontend reads content unauthenticated), and at least one row in that table must have a non-NULL updatedBy or createdBy foreign key pointing to an admin_users row, which happens automatically whenever an admin edits content through the admin UI. Developers auditing Strapi permissions can follow disclosures like this via daily.dev."}}]} ```