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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.

Eclipse lyo是美国Eclipse基金会开源的一套工具链集成框架。 Eclipse lyo 2.0.0版本至7.0.0版本存在授权问题漏洞，该漏洞源于当服务器支持2-legged auth时，OAuth服务器授权检查可被绕过，基于Lyo提供的AbstractAdapterCredentialsFilter的授权过滤器存在缺陷，导致攻击者可创建临时受信任客户端并立即作为受信任客户端使用，无需管理员批准清除临时状态。

CVSS 9.1 · Critical EPSS 0.51% · P43

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
Vulnerability Title
Eclipse lyo 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Eclipse lyo是美国Eclipse基金会开源的一套工具链集成框架。 Eclipse lyo 2.0.0版本至7.0.0版本存在授权问题漏洞，该漏洞源于当服务器支持2-legged auth时，OAuth服务器授权检查可被绕过，基于Lyo提供的AbstractAdapterCredentialsFilter的授权过滤器存在缺陷，导致攻击者可创建临时受信任客户端并立即作为受信任客户端使用，无需管理员批准清除临时状态。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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