Vulnerability-Lookup

CVE-2026-76803 (GCVE-0-2026-76803)

Vulnerability from cvelistv5 – Published: 2026-09-22 16:27 – Updated: 2026-09-25 23:44

Title

Nuclei: Local File Read via MySQL Client Sandbox Bypass

Summary

Nuclei is a vulnerability scanner built on a simple YAML-based DSL. From 3.0.0 until 3.10.0, the nuclei/mysql JavaScript library does not enforce the local-file sandbox when a JavaScript template supplies the allowAllFiles MySQL DSN option. An untrusted javascript: template scanning an attacker-controlled MySQL-compatible endpoint can cause the server to issue LOAD DATA LOCAL INFILE requests for arbitrary paths, after which the scanner's MySQL client reads the files and returns their contents to the server even though -allow-local-file-access is disabled. JavaScript templates can run unsigned and without the -code flag on affected versions, and the bypass affects CLI and SDK deployments that accept untrusted templates. This issue is fixed in version 3.10.0.

Severity

5.3 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-25 23:44 UTC

CWE

CWE-284 - Improper Access Control

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7652 records in the last 180 days details

References

4 references

URL	Tags
https://github.com/projectdiscovery/nuclei/securi…	x_refsource_CONFIRM
https://github.com/projectdiscovery/nuclei/pull/7473	x_refsource_MISC
https://github.com/projectdiscovery/nuclei/commit…	x_refsource_MISC
https://github.com/projectdiscovery/nuclei/releas…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
projectdiscovery	nuclei	Affected: >= 3.0.0, < 3.10.0	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-76803

Vulnerability from fkie_nvd - Published: 2026-09-22 17:17 - Updated: 2026-09-26 00:16

Severity

5.3 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/projectdiscovery/nuclei/commit/9611926a9a1ca99e8ed554d1b26fbeff60e06368
	security-advisories@github.com	https://github.com/projectdiscovery/nuclei/pull/7473
	security-advisories@github.com	https://github.com/projectdiscovery/nuclei/releases/tag/v3.10.0
	security-advisories@github.com	https://github.com/projectdiscovery/nuclei/security/advisories/GHSA-xhmx-w2j4-rw3q

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "nuclei",
          "vendor": "projectdiscovery",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 3.0.0, \u003c 3.10.0"
            }
          ]
        }
      ],
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    }
  ],
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    }
  ],
  "id": "CVE-2026-76803",
  "lastModified": "2026-09-26T00:16:35.217",
  "metrics": {
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      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
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        "impactScore": 3.6,
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        "type": "Secondary"
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    },
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}

GHSA-XHMX-W2J4-RW3Q

Vulnerability from github – Published: 2026-09-22 20:37 – Updated: 2026-09-22 20:37

Summary

Nuclei: Local File Read via MySQL Client Sandbox Bypass

Details

A vulnerability in Nuclei's JavaScript MySQL client library allows arbitrary local file reads that bypass the -allow-local-file-access (-lfa) sandbox restriction.

Affected Component

The issue is in the nuclei/mysql JavaScript library used by javascript: protocol templates. The MySQL client connection logic did not enforce the local file access sandbox when handling the allowAllFiles DSN parameter used by LOAD DATA LOCAL INFILE.

Description

Without -lfa, Nuclei confines local file access to the templates directory. However, a javascript: template could connect to a MySQL server with allowAllFiles=true in the connection DSN. With this option enabled, a malicious MySQL server can issue LOAD DATA LOCAL INFILE requests for arbitrary paths on the scanner host. The MySQL client reads the full file contents and sends them to the server, bypassing the same sandbox that blocks direct filesystem reads through other APIs.

javascript: templates execute without the -code flag and unsigned javascript: templates run by default, making this reachable from untrusted third-party templates when scanning attacker-controlled MySQL endpoints.

[!NOTE] The -allow-local-file-access (-lfa) option is off by default. This issue allows bypassing that restriction, not merely expanding an already-enabled capability.

Affected Users

CLI users running untrusted or third-party javascript: templates against MySQL-compatible targets.
SDK users who integrate Nuclei into platforms where end users can supply JavaScript templates and rely on the default -lfa restriction to limit filesystem access.

Patches

The vulnerability is fixed in Nuclei v3.10.0. Upgrading is strongly recommended.
Fix reference: https://github.com/projectdiscovery/nuclei/pull/7473

Mitigation

Upgrade to Nuclei v3.10.0, where the allowAllFiles DSN option is stripped unless -lfa is explicitly enabled.

In the meantime, avoid running JavaScript templates from unverified sources, especially against untrusted database endpoints.

Workarounds

If upgrading is not an option, avoid running untrusted JavaScript templates. There is no flag or configuration that mitigates this bypass on affected versions.

Acknowledgments

Thanks to @daffainfo for reporting this issue.

Severity

5.3 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/projectdiscovery/nuclei/v3"
      },
      "ranges": [
        {
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            {
              "introduced": "3.0.0"
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            }
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          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-76803"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-284"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-22T20:37:19Z",
    "nvd_published_at": "2026-09-22T17:17:24Z",
    "severity": "MODERATE"
  },
  "details": "A vulnerability in Nuclei\u0027s JavaScript MySQL client library allows arbitrary local file reads that bypass the `-allow-local-file-access` (`-lfa`) sandbox restriction.\n\n**Affected Component**\n\nThe issue is in the `nuclei/mysql` JavaScript library used by `javascript:` protocol templates. The MySQL client connection logic did not enforce the local file access sandbox when handling the `allowAllFiles` DSN parameter used by `LOAD DATA LOCAL INFILE`.\n\n**Description**\n\nWithout `-lfa`, Nuclei confines local file access to the templates directory. However, a `javascript:` template could connect to a MySQL server with `allowAllFiles=true` in the connection DSN. With this option enabled, a malicious MySQL server can issue `LOAD DATA LOCAL INFILE` requests for arbitrary paths on the scanner host. The MySQL client reads the full file contents and sends them to the server, bypassing the same sandbox that blocks direct filesystem reads through other APIs.\n\n`javascript:` templates execute without the `-code` flag and unsigned `javascript:` templates run by default, making this reachable from untrusted third-party templates when scanning attacker-controlled MySQL endpoints.\n\n\u003e [!NOTE]\nThe `-allow-local-file-access` (`-lfa`) option is off by default. This issue allows bypassing that restriction, not merely expanding an already-enabled capability.\n\n**Affected Users**\n\n- **CLI users** running untrusted or third-party `javascript:` templates against MySQL-compatible targets.\n- **SDK users** who integrate Nuclei into platforms where end users can supply JavaScript templates and rely on the default `-lfa` restriction to limit filesystem access.\n\n**Patches**\n\n- The vulnerability is fixed in Nuclei v3.10.0. Upgrading is strongly recommended.\n- Fix reference: https://github.com/projectdiscovery/nuclei/pull/7473\n\n**Mitigation**\n\nUpgrade to Nuclei v3.10.0, where the `allowAllFiles` DSN option is stripped unless `-lfa` is explicitly enabled.\n\nIn the meantime, avoid running JavaScript templates from unverified sources, especially against untrusted database endpoints.\n\n**Workarounds**\n\nIf upgrading is not an option, avoid running untrusted JavaScript templates. There is no flag or configuration that mitigates this bypass on affected versions.\n\n**Acknowledgments**\n\nThanks to @daffainfo for reporting this issue.",
  "id": "GHSA-xhmx-w2j4-rw3q",
  "modified": "2026-09-22T20:37:19Z",
  "published": "2026-09-22T20:37:19Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/projectdiscovery/nuclei/security/advisories/GHSA-xhmx-w2j4-rw3q"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-76803"
    },
    {
      "type": "WEB",
      "url": "https://github.com/projectdiscovery/nuclei/pull/7473"
    },
    {
      "type": "WEB",
      "url": "https://github.com/projectdiscovery/nuclei/commit/9611926a9a1ca99e8ed554d1b26fbeff60e06368"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/projectdiscovery/nuclei"
    },
    {
      "type": "WEB",
      "url": "https://github.com/projectdiscovery/nuclei/releases/tag/v3.10.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Nuclei: Local File Read via MySQL Client Sandbox Bypass"
}

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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.
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CVE-2026-76803 (GCVE-0-2026-76803)

FKIE_CVE-2026-76803

GHSA-XHMX-W2J4-RW3Q

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