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CVE-2026-66882— Reflected XSS in AshAuthentication confirmation and magic link interaction forms

Quick assessment

Affected
team-alembic ash_authentication
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 team-alembic AshAuthentication 中存在一种“网页生成过程中对输入处理不当”（XSS）漏洞，允许通过确认表单和魔法链接（magic link）交互表单实现反射型跨站脚本攻击。 当策略配置中 设置为 时，AshAuthentication 会提供一个中间 HTML 页面，要求用户通过提交表单来确认操作。这两个页面都会将一个请求参数直接嵌入到隐藏输入框的 属性中，且未进行 HTML 转义： 会插值 参数，而 会插值魔法链接令牌（magic link token）参数。这些模板使用 编译，

CVSS 2.1 · Low EPSS 0.42% · P35

Affected Version Matrix 3

VendorProduct Version RangeStatus
team-alembic ash_authentication 4.8.0< 4.14.2 affected
5.0.0-rc.0< 5.0.0-rc.13 affected
fe0b4558dbe852fee5d81a460a8355577618a8c8< * affected
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I. Basic Information for CVE-2026-66882

Vulnerability Information
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Vulnerability Title
Reflected XSS in AshAuthentication confirmation and magic link interaction forms
Source: CVE Program / CVE List V5
Vulnerability Description
Improper Neutralization of Input During Web Page Generation (XSS) vulnerability in team-alembic AshAuthentication allows reflected cross-site scripting via the confirmation and magic link interaction forms. When a strategy is configured with require_interaction? set to true, AshAuthentication serves an intermediate HTML page asking the user to confirm the action by submitting a form. Both such pages embed a request parameter directly into a hidden input's value attribute without HTML escaping: lib/ash_authentication/add_ons/confirmation/confirmation_form.html.eex interpolates the confirm parameter, and lib/ash_authentication/strategies/magic_link/sign_in_form.html.eex interpolates the magic link token parameter. These templates are compiled with EEx.function_from_file/3 using plain <%= %> expressions, which perform no escaping, so the parameter is reflected verbatim. Neither accept handler validates the value before rendering it. AshAuthentication.AddOn.Confirmation.Plug.accept/2 only checks that a confirm key is present, and AshAuthentication.Strategy.MagicLink.Plug.accept/2 reads the parameter directly, so no token signature is verified at this stage and arbitrary attacker-supplied text reaches the template. An unauthenticated attacker can therefore craft a URL whose parameter terminates the attribute and injects markup, for example a quote followed by a <script> element. Because the accept phase is served over GET, loading the crafted link is sufficient; no form submission or prior authentication is required. The injected script executes in the origin of the application embedding AshAuthentication, giving it access to that origin's cookies, session, and same-origin responses. Since these pages are part of the authentication flow, a victim following what appears to be a legitimate confirmation or sign-in link is a plausible target. This issue affects ash_authentication: from 4.8.0 before 4.14.2 and from 5.0.0-rc.0 before 5.0.0-rc.13.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
team-alembic ash_authentication 4.8.0 ~ 4.14.2 cpe:2.3:a:team-alembic:ash_authentication:*:*:*:*:*:*:*:*
team-alembic ash_authentication fe0b4558dbe852fee5d81a460a8355577618a8c8 ~ * cpe:2.3:a:team-alembic:ash_authentication:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-66882

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III. Intelligence Information for CVE-2026-66882

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Patches & Fixes for CVE-2026-66882 (2)

Vendor Advisories for CVE-2026-66882 (1)

Other References for CVE-2026-66882 (1)

IV. Related Vulnerabilities

Same product: ash_authentication
Same vendor: team-alembic
Same weakness: CWE-79

V. Comments for CVE-2026-66882

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