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CVE-2026-54430— Server-Site Request Forgery in liboauth2

Quick assessment

Affected
OpenIDC liboauth2
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.

OpenIDC liboauth2是OpenIDC公司的一个OAuth2协议实现库。 OpenIDC liboauth2 2.3.0之前版本存在服务端请求伪造漏洞，该漏洞源于在oauth2_jose_jwks_aws_alb_resolve()函数中容易受到服务端请求伪造攻击。

AI Predicted 7.5 Difficulty: Easy EPSS 0.17% · P6

Affected Version Matrix 1

VendorProduct Version RangeStatus
OpenIDC liboauth2 < 2.3.0 affected
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I. Basic Information for CVE-2026-54430

Vulnerability Information
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Vulnerability Title
Server-Site Request Forgery in liboauth2
Source: CVE Program / CVE List V5
Vulnerability Description
liboauth2 is vulnerable to Server-Side Request Forgery in oauth2_jose_jwks_aws_alb_resolve() function. The AWS ALB verifier reads both signer and kid from the unverified JWT header. If signer matches the configured ARN, kid is appended to alb_base_url without URL encoding or path sanitization, and the HTTP GET is issued before signature verification. This allows an attacker to force the server to send a GET request to an attacker-chosen internal path. This issue was fixed in version 2.3.0
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
OpenIDC liboauth2 服务端请求伪造漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenIDC liboauth2是OpenIDC公司的一个OAuth2协议实现库。 OpenIDC liboauth2 2.3.0之前版本存在服务端请求伪造漏洞，该漏洞源于在oauth2_jose_jwks_aws_alb_resolve()函数中容易受到服务端请求伪造攻击。
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
OpenIDC liboauth2 0 ~ 2.3.0 -

II. Public POCs for CVE-2026-54430

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III. Intelligence Information for CVE-2026-54430

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Patches & Fixes for CVE-2026-54430 (1)

Security Blog Posts for CVE-2026-54430 (2)

IV. Related Vulnerabilities

Same product: liboauth2
Same vendor: OpenIDC
Same weakness: CWE-918

V. Comments for CVE-2026-54430

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