CVE-2026-125398 (GCVE-0-2026-125398)

Vulnerability from cvelistv5 – Published: 2026-11-09 23:28 – Updated: 2026-11-09 23:28
VLAI
Title
Instatic before 0.0.21 Authorization Bypass via Row Author Reassignment Endpoint
Summary
Instatic before 0.0.21 contains an authorization bypass vulnerability in handleRowAuthor that allows authenticated users to skip table-level access checks by loading rows with getDataRow() instead of loadRowForAccess(). Attackers holding content.edit.any but lacking data.system.tables.read can send PATCH requests to /admin/api/cms/data/rows/:id/author to read system-table rows and reassign their authors.
Severity
7.1 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
7.1 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
CWE
Assigner
VulnCheck CNA
References
Impacted products
Vendor Product Version
CoreBunch Instatic Affected: 0 , < 0.0.21 (semver)
Create a notification for this product.
Date Public
2026-11-03 00:00
Credits
Sriman Aluvala
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Instatic",
          "repo": "https://github.com/CoreBunch/Instatic",
          "vendor": "CoreBunch",
          "versions": [
            {
              "lessThan": "0.0.21",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Sriman Aluvala"
        }
      ],
      "datePublic": "2026-11-03T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "Instatic before 0.0.21 contains an authorization bypass vulnerability in handleRowAuthor that allows authenticated users to skip table-level access checks by loading rows with getDataRow() instead of loadRowForAccess(). Attackers holding content.edit.any but lacking data.system.tables.read can send PATCH requests to /admin/api/cms/data/rows/:id/author to read system-table rows and reassign their authors."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "privilegesRequired": "LOW",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "LOW"
          },
          "format": "CVSS"
        },
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "LOW",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N",
            "version": "3.1"
          },
          "format": "CVSS"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-862",
              "description": "Missing Authorization",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-11-09T23:28:01.464Z",
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck"
      },
      "references": [
        {
          "name": "GitHub Security Advisory (GHSA-m425-wmrc-4v4v)",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://github.com/CoreBunch/Instatic/security/advisories/GHSA-m425-wmrc-4v4v"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/CoreBunch/Instatic/commit/ff1e51eb59c860864fa24e8c3e2716b56314f3ad"
        },
        {
          "name": "Instatic v0.0.21 Release Notes",
          "tags": [
            "release-notes"
          ],
          "url": "https://github.com/CoreBunch/Instatic/releases/tag/v0.0.21"
        },
        {
          "tags": [
            "technical-description"
          ],
          "url": "https://github.com/CoreBunch/Instatic/blob/v0.0.20/server/handlers/cms/data/rows.ts#L378-L398"
        },
        {
          "name": "VulnCheck Advisory: Instatic before 0.0.21 Authorization Bypass via Row Author Reassignment Endpoint",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://www.vulncheck.com/advisories/instatic-before-0.0.21-authorization-bypass-via-row-author-reassignment-endpoint"
        }
      ],
      "title": "Instatic before 0.0.21 Authorization Bypass via Row Author Reassignment Endpoint",
      "x_generator": {
        "engine": "vulncheck-endgame"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-125398",
    "datePublished": "2026-11-09T23:28:01.464Z",
    "dateReserved": "2026-11-09T22:03:14.422Z",
    "dateUpdated": "2026-11-09T23:28:01.464Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}



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