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CVE-2026-18918— OAuth 1.0 session-fixation chain via unauthenticated provisional-consumer registration and insecure v1_0Allowed default

Quick assessment

Affected
Eclipse Foundation Eclipse Lyo
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 Eclipse Lyo 2.0.0 到 7.0.0 版本中，当服务器支持两腿认证（2-legged authentication）时，OAuth 服务器的授权检查可能被绕过。在这种情况下，基于 Lyo 提供的 构建其授权过滤器的应用程序存在漏洞。 攻击者可以创建一个临时的受信任客户端（这是一种有效的使用场景），但该客户端无需管理员批准即可立即作为受信任客户端使用，从而清除了其临时状态。需要用户交互的三腿认证路径不受影响，并且会拒绝临时客户端。

CVSS 9.1 · Critical

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle

Affected Version Matrix 1

VendorProduct Version RangeStatus
Eclipse Foundation Eclipse Lyo 2.0.0< 7.0.0 affected
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I. Basic Information for CVE-2026-18918

Vulnerability Information
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Vulnerability Title
OAuth 1.0 session-fixation chain via unauthenticated provisional-consumer registration and insecure v1_0Allowed default
Source: CVE Program / CVE List V5
Vulnerability Description
In Eclipse Lyo versions 2.0.0 to 7.0.0, OAuth server authorization checks can be bypassed when the 2-legged auth is supported by the server. In those cases, application that based their authz filters upon Lyo-provided `AbstractAdapterCredentialsFilter`, are vulnerable. An attacked can create a provisional trusted client (valid use-case) but then it can be used as a trusted client immediately without requiring the administrator approval to clear the provisional status. The 3-legged path requiring user interaction is not vulnerable and rejects provisional clients.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/AU:Y/R:U/V:C/RE:L/U:Red
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Eclipse Foundation Eclipse Lyo 2.0.0 ~ 7.0.0 -

II. Public POCs for CVE-2026-18918

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III. Intelligence Information for CVE-2026-18918

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Vendor Pages for CVE-2026-18918 (3)

IV. Related Vulnerabilities

Same product: Eclipse Lyo
Same vendor: Eclipse Foundation
Same weakness: CWE-863

V. Comments for CVE-2026-18918

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