CVE-2023-26482
Status: ModifiedHigh (8.8)—
Nextcloud server is an open source home cloud implementation. In affected versions a missing scope validation allowed users to create workflows which are designed to be only available for administrators. Some workflows are designed to be RCE by invoking defined scripts, in order to generate PDFs, invoking webhooks or running scripts on the server. Due to this combination depending on the available apps the issue can result in a RCE at the end. It is recommended that the Nextcloud Server is upgraded to 24.0.10 or 25.0.4. Users unable to upgrade should disable app `workflow_scripts` and `workflow_pdf_converter` as a mitigation.
CVSS
- Version: 3.1
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Base score: 8.8
Exploitation probability (EPSS)
- Probability of exploitation in the next 30 days: 4.18%
- Percentile among all scored CVEs: 91
- Score date: 10/6/2026
EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).
Affected technologies (1)
CWEs
- CWE-78
- NVD-CWE-noinfo
References
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-h3c9-cmh8-7qpj
- https://github.com/nextcloud/server/commit/5a06b50b10cc9278bbe68bbf897a0c4aeb0c4e60
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-h3c9-cmh8-7qpj
- https://github.com/nextcloud/server/commit/5a06b50b10cc9278bbe68bbf897a0c4aeb0c4e60
Raw JSON (NVD)
Show
{
"id": "CVE-2023-26482",
"cveTags": [],
"metrics": {
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2023-26482",
"role": "CISA Coordinator",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "total"
}
],
"version": "2.0.3",
"timestamp": "2025-02-11T18:54:30.467700Z"
}
}
],
"cvssMetricV31": [
{
"type": "Secondary",
"source": "security-advisories@github.com",
"cvssData": {
"scope": "CHANGED",
"version": "3.1",
"baseScore": 9,
"attackVector": "NETWORK",
"baseSeverity": "CRITICAL",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H",
"integrityImpact": "HIGH",
"userInteraction": "REQUIRED",
"attackComplexity": "LOW",
"availabilityImpact": "HIGH",
"privilegesRequired": "LOW",
"confidentialityImpact": "HIGH"
},
"impactScore": 6,
"exploitabilityScore": 2.3
},
{
"type": "Primary",
"source": "nvd@nist.gov",
"cvssData": {
"scope": "UNCHANGED",
"version": "3.1",
"baseScore": 8.8,
"attackVector": "NETWORK",
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"integrityImpact": "HIGH",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "HIGH",
"privilegesRequired": "LOW",
"confidentialityImpact": "HIGH"
},
"impactScore": 5.9,
"exploitabilityScore": 2.8
}
]
},
"affected": [
{
"source": "security-advisories@github.com",
"affectedData": [
{
"vendor": "nextcloud",
"product": "security-advisories",
"versions": [
{
"status": "affected",
"version": "< 24.0.10"
},
{
"status": "affected",
"version": ">= 25.0.0, < 25.0.4"
}
]
}
]
}
],
"published": "2023-03-30T19:15:06.523",
"references": [
{
"url": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-h3c9-cmh8-7qpj",
"tags": [
"Vendor Advisory"
],
"source": "security-advisories@github.com"
},
{
"url": "https://github.com/nextcloud/server/commit/5a06b50b10cc9278bbe68bbf897a0c4aeb0c4e60",
"tags": [
"Patch"
],
"source": "security-advisories@github.com"
},
{
"url": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-h3c9-cmh8-7qpj",
"tags": [
"Vendor Advisory"
],
"source": "af854a3a-2127-422b-91ae-364da2661108"
},
{
"url": "https://github.com/nextcloud/server/commit/5a06b50b10cc9278bbe68bbf897a0c4aeb0c4e60",
"tags": [
"Patch"
],
"source": "af854a3a-2127-422b-91ae-364da2661108"
}
],
"vulnStatus": "Modified",
"weaknesses": [
{
"type": "Secondary",
"source": "security-advisories@github.com",
"description": [
{
"lang": "en",
"value": "CWE-78"
}
]
},
{
"type": "Primary",
"source": "nvd@nist.gov",
"description": [
{
"lang": "en",
"value": "NVD-CWE-noinfo"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "Nextcloud server is an open source home cloud implementation. In affected versions a missing scope validation allowed users to create workflows which are designed to be only available for administrators. Some workflows are designed to be RCE by invoking defined scripts, in order to generate PDFs, invoking webhooks or running scripts on the server. Due to this combination depending on the available apps the issue can result in a RCE at the end. It is recommended that the Nextcloud Server is upgraded to 24.0.10 or 25.0.4. Users unable to upgrade should disable app `workflow_scripts` and `workflow_pdf_converter` as a mitigation."
}
],
"lastModified": "2026-06-17T05:43:26.017",
"configurations": [
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:*",
"vulnerable": true,
"matchCriteriaId": "F96F0D08-EE3D-4796-A6AC-B63E53770F60",
"versionEndExcluding": "20.0.14.12",
"versionStartIncluding": "18.0.0"
},
{
"criteria": "cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:*",
"vulnerable": true,
"matchCriteriaId": "BFCBAD36-04D2-47EC-836E-35EFC1D6E060",
"versionEndExcluding": "21.0.9.10",
"versionStartIncluding": "21.0.0"
},
{
"criteria": "cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:*",
"vulnerable": true,
"matchCriteriaId": "C5886100-3157-4377-8681-381720CFDA8E",
"versionEndExcluding": "22.2.10.10",
"versionStartIncluding": "22.0.0"
},
{
"criteria": "cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:*",
"vulnerable": true,
"matchCriteriaId": "F2FEEE2E-6BF9-4332-99A3-690EF68D884F",
"versionEndExcluding": "23.0.12.5",
"versionStartIncluding": "23.0.0"
},
{
"criteria": "cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:-:*:*:*",
"vulnerable": true,
"matchCriteriaId": "302FFA48-9204-4112-BF23-6182ED62F193",
"versionEndExcluding": "24.0.10",
"versionStartIncluding": "24.0.0"
},
{
"criteria": "cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:*",
"vulnerable": true,
"matchCriteriaId": "3D2D0CEB-437C-4ABA-9915-EFCB776E7ADC",
"versionEndExcluding": "24.0.10",
"versionStartIncluding": "24.0.0"
},
{
"criteria": "cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:-:*:*:*",
"vulnerable": true,
"matchCriteriaId": "282F04F1-B4E4-4DC2-82CA-55DB39A3F373",
"versionEndExcluding": "25.0.4",
"versionStartIncluding": "25.0.0"
},
{
"criteria": "cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:*",
"vulnerable": true,
"matchCriteriaId": "E14A1D06-7AB2-40C2-806F-7EE34595DAF7",
"versionEndExcluding": "25.0.4",
"versionStartIncluding": "25.0.0"
}
],
"operator": "OR"
}
]
}
],
"sourceIdentifier": "security-advisories@github.com"
}