Vulnerability-Lookup

CVE-2026-67349 (GCVE-0-2026-67349)

Vulnerability from cvelistv5 – Published: 2026-07-30 14:40 – Updated: 2026-07-31 22:56 X_Open Source

Title

OpenCost < 1.121.0 Unauthenticated Helm Values Exposure and Admin Bypass

Summary

OpenCost before 1.121.0 fails to authenticate the GET /helmValues endpoint, exposing base64-decoded HELM_VALUES environment variable containing cloud provider credentials. Additionally, adminAuthMiddleware fails open when ADMIN_TOKEN is unset, allowing unauthenticated attackers to modify GCP service account keys via POST /serviceKey to redirect billing calls.

Severity

8.7 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-306 - Missing Authentication for Critical Function

Assigner

VulnCheck

References

5 references

URL	Tags
https://github.com/opencost/opencost/issues/3893	technical-descriptionexploitissue-tracking
https://github.com/opencost/opencost/releases/tag…	release-notes
https://github.com/opencost/opencost/pull/3910	issue-trackingpatch
https://github.com/opencost/opencost/commit/a49a2…	patch
https://www.vulncheck.com/advisories/opencost-una…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
opencost	opencost	Affected: 0 , < 1.121.0 (semver)

Date Public

2026-07-02 00:00

Credits

George Chen

Show details on NVD website

JSON

To clipboard

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                "id": "CVE-2026-67349",
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}

GHSA-FQ2P-HX59-R7G8

Vulnerability from github – Published: 2026-07-30 15:31 – Updated: 2026-07-30 15:31

Details

Severity

7.5 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

8.7 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-67349"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-306"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-30T15:16:36Z",
    "severity": "HIGH"
  },
  "details": "OpenCost before 1.121.0 fails to authenticate the GET /helmValues endpoint, exposing base64-decoded HELM_VALUES environment variable containing cloud provider credentials. Additionally, adminAuthMiddleware fails open when ADMIN_TOKEN is unset, allowing unauthenticated attackers to modify GCP service account keys via POST /serviceKey to redirect billing calls.",
  "id": "GHSA-fq2p-hx59-r7g8",
  "modified": "2026-07-30T15:31:53Z",
  "published": "2026-07-30T15:31:52Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-67349"
    },
    {
      "type": "WEB",
      "url": "https://github.com/opencost/opencost/issues/3893"
    },
    {
      "type": "WEB",
      "url": "https://github.com/opencost/opencost/pull/3910"
    },
    {
      "type": "WEB",
      "url": "https://github.com/opencost/opencost/commit/a49a25bc2e0d6e220a131a4dc58f38ebe6ae851b"
    },
    {
      "type": "WEB",
      "url": "https://github.com/opencost/opencost/releases/tag/core/v1.121.0"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/opencost-unauthenticated-helm-values-exposure-and-admin-bypass"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/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"
    }
  ]
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

CVE-2026-67349 (GCVE-0-2026-67349)

GHSA-FQ2P-HX59-R7G8

Tags

Sightings

Nomenclature