Vulnerability-Lookup

GHSA-WR27-GH7C-5Q9V

Vulnerability from github – Published: 2026-09-30 15:31 – Updated: 2026-09-30 15:31

Details

bbs-go through 4.4.6 contains a permission bypass vulnerability in the AdminMiddleware authorization logic where the read-only dashboard.user.view permission rule matches the /api/admin/user/synccount endpoint before the intended dashboard.user.update rule. Authenticated users with only view permissions can call the synccount endpoint to trigger expensive full-table user recounts and cache invalidations, causing denial of service through repeated concurrent database operations.

Severity

4.3 (Medium)


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

5.3 (Medium)


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

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JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-103396"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-863"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-30T15:22:28Z",
    "severity": "MODERATE"
  },
  "details": "bbs-go through 4.4.6 contains a permission bypass vulnerability in the AdminMiddleware authorization logic where the read-only dashboard.user.view permission rule matches the /api/admin/user/synccount endpoint before the intended dashboard.user.update rule. Authenticated users with only view permissions can call the synccount endpoint to trigger expensive full-table user recounts and cache invalidations, causing denial of service through repeated concurrent database operations.",
  "id": "GHSA-wr27-gh7c-5q9v",
  "modified": "2026-09-30T15:31:34Z",
  "published": "2026-09-30T15:31:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-103396"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mlogclub/bbs-go/issues/303"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mlogclub/bbs-go/commit/97d0bb3dcbacd686fd5300295afbf4f4a5da7609"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mlogclub/bbs-go"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mlogclub/bbs-go/blob/v4.4.6/internal/handlers/admin/user_handlers.go#L47-L59"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mlogclub/bbs-go/blob/v4.4.6/internal/permissions/admin_permission_registry.go#L59-L60"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/bbs-go-through-4.4.6-incorrect-authorization-via-api-admin-user-synccount"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/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"
    }
  ]
}

CVE-2026-103396 (GCVE-0-2026-103396)

Vulnerability from cvelistv5 – Published: 2026-09-30 14:48 – Updated: 2026-09-30 16:57

Title

bbs-go through 4.4.6 Incorrect Authorization via /api/admin/user/synccount

Summary

Severity

5.3 (Medium)


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

4.3 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-30 16:57 UTC

CWE

CWE-863 - Incorrect Authorization

Assigner

VulnCheck mitre root Scorecard

References

6 references

URL	Tags
https://github.com/mlogclub/bbs-go/issues/303	issue-tracking
https://github.com/mlogclub/bbs-go/commit/97d0bb3…	patch
https://github.com/mlogclub/bbs-go/blob/v4.4.6/in…	technical-description
https://github.com/mlogclub/bbs-go/blob/v4.4.6/in…	technical-description
https://github.com/mlogclub/bbs-go	product
https://www.vulncheck.com/advisories/bbs-go-throu…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
mlogclub	bbs-go	Affected: 0 , ≤ 4.4.6 (semver) cpe:2.3:a:bbs-go_project:bbs-go::::::::

Date Public

2026-09-17 00:00

Credits

George Chen

Show details on NVD website

JSON

To clipboard

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                "id": "CVE-2026-103396",
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                  },
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                    "Technical Impact": "partial"
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                "role": "CISA Coordinator",
                "timestamp": "2026-09-30T16:57:45.943159Z",
                "version": "2.0.3"
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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.

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.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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GHSA-WR27-GH7C-5Q9V

CVE-2026-103396 (GCVE-0-2026-103396)

Tags

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Nomenclature

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