CVE-2026-76877— WPML 4.9.7 语言域 SSO 认证绕过漏洞
一分钟漏洞结论
影响对象
WPML WPML Multilingual CMS
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
WordPress 的 WPML Multilingual CMS 插件在 4.9.7 及更早版本中存在一个通过竞态条件导致的身份验证绕过漏洞。该漏洞的根源在于：在登出落地页上， 函数中负责“按域单点登录（SSO）”的处理器调用 生成了跨域登录令牌；然而此时浏览器已丢弃了认证 Cookie，导致 返回空字符串，从而使该令牌退化为当前 12 小时时间片内所有匿名用户共享的匿名 nonce，而非与特定用户绑定的密钥。随后，该令牌被存储到名为 的临时缓存（transient）中，并映射到受害者的 ，却未与具体的登出操作或
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一、 漏洞 CVE-2026-76877 基础信息
漏洞信息
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Vulnerability Title
WPML Multilingual CMS <= 4.9.7 - Unauthenticated Authentication Bypass in Language-per-Domain SSO via 'wpml_sso_token_domain' Parameter
来源: CVE Program / CVE List V5
Vulnerability Description
The WPML Multilingual CMS plugin for WordPress is vulnerable to Authentication Bypass via Race Condition in versions up to, and including, 4.9.7. This is due to the `process_iframe_request` function's language-per-domain SSO handler generating the cross-domain sign-in token via `wp_create_nonce('wpml_sso')` on the logout landing page, where the browser has already discarded its authentication cookies — so `wp_get_session_token()` returns an empty string and the token collapses to the shared anonymous nonce for the current 12-hour tick rather than a user-bound secret — and then storing it in the `wpml_sso_user_<token>_<sha256('wpml_sso'.$domain)>` transient mapped to the victim's `user_id` with no binding to the specific sign-out action or requesting client. Because an unauthenticated attacker can independently derive the identical token by triggering the logout confirmation flow on `wp-login.php?action=logout`, and because the `is_iframe_request()` gate conditions (the per-domain SSO `started` transient and domain-hash derived from the public constant `SSO_NONCE`) are fully computable within the 60-second `SSO_TIMEOUT` window, an unauthenticated attacker can submit the forged `wpml_sso_token_domain` parameter with a `wpml_user_signed_in` status to a secondary language-domain endpoint before the legitimate `wpml_user_signed_out` iframe fires, causing WordPress authentication cookies to be issued for the victim. This makes it possible for unauthenticated attackers to gain access to accounts of users — including administrators — who are actively in the process of logging out during the race window.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
来源: CVE Program / CVE List V5
受影响产品
| 厂商 | 产品 | 影响版本 | CPE | 订阅 |
|---|---|---|---|---|
| WPML | WPML Multilingual CMS | 0 ~ 4.9.7 | - |
|
二、漏洞 CVE-2026-76877 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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