Vulnerability-Lookup

CVE-2026-9780 (GCVE-0-2026-9780)

Vulnerability from cvelistv5 – Published: 2026-06-24 23:13 – Updated: 2026-06-25 12:48

Title

Quest NetVault Backup addclient3 Cross-Site Scripting Authentication Bypass Vulnerability

Summary

Quest NetVault Backup addclient3 Cross-Site Scripting Authentication Bypass Vulnerability. This vulnerability allows remote attackers to bypass authentication on affected installations of Quest NetVault Backup. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the addclient3 webpage. The issue results from the lack of proper validation of user-supplied data, which can lead to the injection of an arbitrary script. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of SYSTEM. Was ZDI-CAN-27666.

Severity

8.8 (High)


                        
                          CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Assigner

zdi

References

2 references

URL	Tags
https://www.zerodayinitiative.com/advisories/ZDI-…	x_research-advisory
https://support.quest.com/technical-documents/net…	vendor-advisory

Impacted products

1 product

Vendor	Product	Version
Quest	NetVault Backup	Affected: 14.0.1.7

Date Public

2026-06-24 20:23

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-9780",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-25T12:47:12.693151Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-25T12:48:17.796Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unknown",
          "product": "NetVault Backup",
          "vendor": "Quest",
          "versions": [
            {
              "status": "affected",
              "version": "14.0.1.7"
            }
          ]
        }
      ],
      "dateAssigned": "2026-05-27T22:27:43.898Z",
      "datePublic": "2026-06-24T20:23:51.633Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "Quest NetVault Backup addclient3 Cross-Site Scripting Authentication Bypass Vulnerability. This vulnerability allows remote attackers to bypass authentication on affected installations of Quest NetVault Backup. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.\n\nThe specific flaw exists within the addclient3 webpage. The issue results from the lack of proper validation of user-supplied data, which can lead to the injection of an arbitrary script. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of SYSTEM. Was ZDI-CAN-27666."
        }
      ],
      "metrics": [
        {
          "cvssV3_0": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.0"
          },
          "format": "CVSS"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-79",
              "description": "CWE-79: Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-24T23:13:55.522Z",
        "orgId": "99f1926a-a320-47d8-bbb5-42feb611262e",
        "shortName": "zdi"
      },
      "references": [
        {
          "name": "ZDI-26-369",
          "tags": [
            "x_research-advisory"
          ],
          "url": "https://www.zerodayinitiative.com/advisories/ZDI-26-369/"
        },
        {
          "name": "vendor-provided URL",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://support.quest.com/technical-documents/netvault/14.0.2/release-notes#TOPIC-2338529"
        }
      ],
      "source": {
        "lang": "en",
        "value": "06fe5fd2bc53027c4a3b7e395af0b850e7b8a044"
      },
      "title": "Quest NetVault Backup addclient3 Cross-Site Scripting Authentication Bypass Vulnerability"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "99f1926a-a320-47d8-bbb5-42feb611262e",
    "assignerShortName": "zdi",
    "cveId": "CVE-2026-9780",
    "datePublished": "2026-06-24T23:13:55.522Z",
    "dateReserved": "2026-05-27T22:27:43.798Z",
    "dateUpdated": "2026-06-25T12:48:17.796Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-9780",
      "date": "2026-06-25",
      "epss": "0.00705",
      "percentile": "0.48607"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-9780\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-06-25T12:47:12.693151Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-06-25T12:47:17.248Z\"}}], \"cna\": {\"title\": \"Quest NetVault Backup addclient3 Cross-Site Scripting Authentication Bypass Vulnerability\", \"source\": {\"lang\": \"en\", \"value\": \"06fe5fd2bc53027c4a3b7e395af0b850e7b8a044\"}, \"metrics\": [{\"format\": \"CVSS\", \"cvssV3_0\": {\"version\": \"3.0\", \"baseScore\": 8.8, \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H\"}}], \"affected\": [{\"vendor\": \"Quest\", \"product\": \"NetVault Backup\", \"versions\": [{\"status\": \"affected\", \"version\": \"14.0.1.7\"}], \"defaultStatus\": \"unknown\"}], \"datePublic\": \"2026-06-24T20:23:51.633Z\", \"references\": [{\"url\": \"https://www.zerodayinitiative.com/advisories/ZDI-26-369/\", \"name\": \"ZDI-26-369\", \"tags\": [\"x_research-advisory\"]}, {\"url\": \"https://support.quest.com/technical-documents/netvault/14.0.2/release-notes#TOPIC-2338529\", \"name\": \"vendor-provided URL\", \"tags\": [\"vendor-advisory\"]}], \"dateAssigned\": \"2026-05-27T22:27:43.898Z\", \"descriptions\": [{\"lang\": \"en\", \"value\": \"Quest NetVault Backup addclient3 Cross-Site Scripting Authentication Bypass Vulnerability. This vulnerability allows remote attackers to bypass authentication on affected installations of Quest NetVault Backup. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.\\n\\nThe specific flaw exists within the addclient3 webpage. The issue results from the lack of proper validation of user-supplied data, which can lead to the injection of an arbitrary script. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of SYSTEM. Was ZDI-CAN-27666.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-79\", \"description\": \"CWE-79: Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)\"}]}], \"providerMetadata\": {\"orgId\": \"99f1926a-a320-47d8-bbb5-42feb611262e\", \"shortName\": \"zdi\", \"dateUpdated\": \"2026-06-24T23:13:55.522Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-9780\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-06-25T12:48:17.796Z\", \"dateReserved\": \"2026-05-27T22:27:43.798Z\", \"assignerOrgId\": \"99f1926a-a320-47d8-bbb5-42feb611262e\", \"datePublished\": \"2026-06-24T23:13:55.522Z\", \"assignerShortName\": \"zdi\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

GHSA-RHV6-PJ5X-4QFC

Vulnerability from github – Published: 2026-06-25 00:33 – Updated: 2026-06-25 00:33

Details

The specific flaw exists within the addclient3 webpage. The issue results from the lack of proper validation of user-supplied data, which can lead to the injection of an arbitrary script. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of SYSTEM. Was ZDI-CAN-27666.

Severity

8.8 (High)


                  
                    CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-9780"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-25T00:17:48Z",
    "severity": "HIGH"
  },
  "details": "Quest NetVault Backup addclient3 Cross-Site Scripting Authentication Bypass Vulnerability. This vulnerability allows remote attackers to bypass authentication on affected installations of Quest NetVault Backup. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.\n\nThe specific flaw exists within the addclient3 webpage. The issue results from the lack of proper validation of user-supplied data, which can lead to the injection of an arbitrary script. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of SYSTEM. Was ZDI-CAN-27666.",
  "id": "GHSA-rhv6-pj5x-4qfc",
  "modified": "2026-06-25T00:33:23Z",
  "published": "2026-06-25T00:33:23Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-9780"
    },
    {
      "type": "WEB",
      "url": "https://support.quest.com/technical-documents/netvault/14.0.2/release-notes#TOPIC-2338529"
    },
    {
      "type": "WEB",
      "url": "https://www.zerodayinitiative.com/advisories/ZDI-26-369"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

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.

Action not permitted

CVE-2026-9780 (GCVE-0-2026-9780)

GHSA-RHV6-PJ5X-4QFC

Tags

Sightings

Nomenclature