Vulnerability-Lookup

CVE-2026-9520 (GCVE-0-2026-9520)

Vulnerability from cvelistv5 – Published: 2026-05-26 01:30 – Updated: 2026-05-27 19:59

Title

blitz-js blitz Sign-in LoginForm.tsx cross site scripting

Summary

A weakness has been identified in blitz-js blitz up to 3.0.2 on GitHub. This impacts an unknown function of the file packages/generator/templates/app/src/app/auth/components/LoginForm.tsx of the component Sign-in. This manipulation of the argument Next causes cross site scripting. It is possible to initiate the attack remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

Severity

5.3 (Medium)


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

4.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R

4.3 (Medium)


                        
                          CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-79 - Cross Site Scripting
CWE-94 - Code Injection

Assigner

VulDB

References

4 references

URL	Tags
https://vuldb.com/vuln/365540	vdb-entrytechnical-description
https://vuldb.com/vuln/365540/cti	signaturepermissions-required
https://vuldb.com/submit/814378	third-party-advisory
https://gist.github.com/TrebledJ/164c7ca6c8208b63…	exploit

Impacted products

1 product

Vendor	Product	Version
blitz-js	blitz	Affected: 3.0.0 Affected: 3.0.1 Affected: 3.0.2 cpe:2.3:a:blitz-js:blitz::::::::

Credits

trebledj (VulDB User) VulDB CNA Team

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-9520

Vulnerability from fkie_nvd - Published: 2026-05-26 02:16 - Updated: 2026-06-17 11:05

Severity

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

Summary

References

	URL	Tags
	cna@vuldb.com	https://gist.github.com/TrebledJ/164c7ca6c8208b63e6937bc11984720b
	cna@vuldb.com	https://vuldb.com/submit/814378
	cna@vuldb.com	https://vuldb.com/vuln/365540
	cna@vuldb.com	https://vuldb.com/vuln/365540/cti

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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  "affected": [
    {
      "affectedData": [
        {
          "cpes": [
            "cpe:2.3:a:blitz-js:blitz:*:*:*:*:*:*:*:*"
          ],
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            "Sign-in"
          ],
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          "vendor": "blitz-js",
          "versions": [
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    }
  ],
  "id": "CVE-2026-9520",
  "lastModified": "2026-06-17T11:05:25.710",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "NONE",
          "baseScore": 5.0,
          "confidentialityImpact": "NONE",
          "integrityImpact": "PARTIAL",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:N",
          "version": "2.0"
        },
        "exploitabilityScore": 10.0,
        "impactScore": 2.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "cna@vuldb.com",
        "type": "Secondary",
        "userInteractionRequired": false
      }
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    "cvssMetricV31": [
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          "confidentialityImpact": "NONE",
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          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N",
          "version": "3.1"
        },
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        "source": "cna@vuldb.com",
        "type": "Secondary"
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          "baseSeverity": "LOW",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "PROOF_OF_CONCEPT",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "PASSIVE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/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",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "LOW",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "cna@vuldb.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-9520",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-05-27T19:59:28.533557Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-05-26T02:16:40.823",
  "references": [
    {
      "source": "cna@vuldb.com",
      "url": "https://gist.github.com/TrebledJ/164c7ca6c8208b63e6937bc11984720b"
    },
    {
      "source": "cna@vuldb.com",
      "url": "https://vuldb.com/submit/814378"
    },
    {
      "source": "cna@vuldb.com",
      "url": "https://vuldb.com/vuln/365540"
    },
    {
      "source": "cna@vuldb.com",
      "url": "https://vuldb.com/vuln/365540/cti"
    }
  ],
  "sourceIdentifier": "cna@vuldb.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        },
        {
          "lang": "en",
          "value": "CWE-94"
        }
      ],
      "source": "cna@vuldb.com",
      "type": "Secondary"
    }
  ]
}

GHSA-H2P9-CR4H-PX24

Vulnerability from github – Published: 2026-05-26 13:30 – Updated: 2026-06-30 17:39

Summary

Blitz has a Cross-site Scripting issue

Details

Severity

4.3 (Medium)


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

2.1 (Low)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "blitz"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "3.0.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-9520"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-30T17:39:56Z",
    "nvd_published_at": "2026-05-26T02:16:40Z",
    "severity": "LOW"
  },
  "details": "A weakness has been identified in blitz-js blitz up to 3.0.2 on GitHub. This impacts an unknown function of the file packages/generator/templates/app/src/app/auth/components/LoginForm.tsx of the component Sign-in. This manipulation of the argument Next causes cross site scripting. It is possible to initiate the attack remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.",
  "id": "GHSA-h2p9-cr4h-px24",
  "modified": "2026-06-30T17:39:56Z",
  "published": "2026-05-26T13:30:53Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-9520"
    },
    {
      "type": "WEB",
      "url": "https://gist.github.com/TrebledJ/164c7ca6c8208b63e6937bc11984720b"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/blitz-js/blitz"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/submit/814378"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/vuln/365540"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/vuln/365540/cti"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Blitz has a Cross-site Scripting issue"
}

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-2026-9520 (GCVE-0-2026-9520)

FKIE_CVE-2026-9520

GHSA-H2P9-CR4H-PX24

Tags

Sightings

Nomenclature