Vulnerability-Lookup

GHSA-QRCR-3862-9F4C

Vulnerability from github – Published: 2026-07-02 12:30 – Updated: 2026-07-02 12:30

Details

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

Severity

5.1 (Medium)


                  
                    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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-54430"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-918"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-02T11:16:16Z",
    "severity": "MODERATE"
  },
  "details": "liboauth2 is vulnerable to Server-Side Request Forgery in\u00a0oauth2_jose_jwks_aws_alb_resolve() function.\u00a0The AWS ALB verifier reads both signer and kid from the unverified JWT\nheader. If signer matches the configured ARN, kid is appended to\nalb_base_url without URL encoding or path sanitization, and the HTTP GET\nis issued before signature verification. This allows an attacker to force\nthe server to send a GET request to an attacker-chosen internal path.\n\nThis issue was fixed in version 2.3.0",
  "id": "GHSA-qrcr-3862-9f4c",
  "modified": "2026-07-02T12:30:59Z",
  "published": "2026-07-02T12:30:59Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-54430"
    },
    {
      "type": "WEB",
      "url": "https://github.com/OpenIDC/liboauth2/commit/347507ac5b51f48c2933bbe49b2ee07c2af4712b"
    },
    {
      "type": "WEB",
      "url": "https://cert.pl/en/posts/2026/07/CVE-2026-54430"
    },
    {
      "type": "WEB",
      "url": "https://github.com/OpenIDC/liboauth2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-54430 (GCVE-0-2026-54430)

Vulnerability from cvelistv5 – Published: 2026-07-02 10:30 – Updated: 2026-07-02 12:17 X_Open Source

Title

Server-Site Request Forgery in liboauth2

Summary

Severity

5.1 (Medium)


                        
                          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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-918 - Server-Side Request Forgery (SSRF)

Assigner

CERT-PL

References

3 references

URL	Tags
https://cert.pl/en/posts/2026/07/CVE-2026-54430	third-party-advisory
https://github.com/OpenIDC/liboauth2	product
https://github.com/OpenIDC/liboauth2/commit/34750…	issue-tracking

Impacted products

1 product

Vendor	Product	Version
OpenIDC	liboauth2	Affected: 0 , < 2.3.0 (semver)

Date Public

2026-07-02 00:00

Credits

Michał Majchrowicz (AFINE Team) Marcin Wyczechowski (AFINE Team)

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JSON

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  "containers": {
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        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-54430",
                "options": [
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                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-02T12:17:15.414798Z",
                "version": "2.0.3"
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
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    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "modules": [
            "oauth2_jose_jwks_aws_alb_resolve()"
          ],
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          "programFiles": [
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        }
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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-QRCR-3862-9F4C

CVE-2026-54430 (GCVE-0-2026-54430)

Tags

Sightings

Nomenclature