OpenIDC liboauth2 up to 2.2.x oauth2_jose_jwks_aws_alb_resolve server-side request forgery

CVSS Meta Temp Score
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CTI Interest Score
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6.0$0-$5k0.68

Summaryinfo

A vulnerability described as critical has been identified in OpenIDC liboauth2 up to 2.2.x. This affects the function oauth2_jose_jwks_aws_alb_resolve. The manipulation results in server-side request forgery. This vulnerability was named CVE-2026-54430. The attack may be performed from remote. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in OpenIDC liboauth2 up to 2.2.x. It has been classified as critical. Affected is the function oauth2_jose_jwks_aws_alb_resolve. The manipulation with an unknown input leads to a server-side request forgery vulnerability. CWE is classifying the issue as CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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

The advisory is shared for download at cert.pl. This vulnerability is traded as CVE-2026-54430 since 06/15/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. There are known technical details, but no exploit is available.

Upgrading to version 2.3.0 eliminates this vulnerability. Applying the patch 347507ac5b51f48c2933bbe49b2ee07c2af4712b is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-41276). Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.0

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Server-side request forgery
CWE: CWE-918
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: liboauth2 2.3.0
Patch: 347507ac5b51f48c2933bbe49b2ee07c2af4712b

Timelineinfo

06/15/2026 CVE reserved
07/02/2026 +17 days Advisory disclosed
07/02/2026 +0 days VulDB entry created
07/02/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: cert.pl
Status: Confirmed

CVE: CVE-2026-54430 (🔒)
GCVE (CVE): GCVE-0-2026-54430
GCVE (VulDB): GCVE-100-375828
EUVD: 🔒

Entryinfo

Created: 07/02/2026 13:44
Updated: 07/02/2026 14:14
Changes: 07/02/2026 13:44 (57), 07/02/2026 14:14 (1)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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