CVE-2026-18386 (GCVE-0-2026-18386)
Vulnerability from cvelistv5 – Published: 2026-09-10 03:40 – Updated: 2026-09-10 03:40
VLAI
EPSS
VEX
Title
WP BackItUp Community Edition <= 2.1.0 - Authenticated (Administrator+) Path Traversal to Arbitrary File Read via 'backup_file' Parameter
Summary
The WP BackItUp Community Edition plugin for WordPress is vulnerable to Directory Traversal in all versions up to, and including, 2.1.0 via the 'backup_file' parameter parameter. This makes it possible for authenticated attackers, with administrator-level access and above, to read the contents of arbitrary files on the server, which can contain sensitive information. The basename() normalization present in the handler only executes when the traversed target path does not exist, providing no protection against reads of existing files.
Severity
4.9 (Medium)
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
9 references
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| cssimmon | WP BackItUp Community Edition |
Affected:
0 , ≤ 2.1.0
(semver)
|
guessed |
{
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"affected": [
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"defaultStatus": "unaffected",
"product": "WP BackItUp Community Edition",
"vendor": "cssimmon",
"versions": [
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"lessThanOrEqual": "2.1.0",
"status": "affected",
"version": "0",
"versionType": "semver"
}
]
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],
"credits": [
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"lang": "en",
"type": "finder",
"value": "Nikola Kojic"
}
],
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"lang": "en",
"value": "The WP BackItUp Community Edition plugin for WordPress is vulnerable to Directory Traversal in all versions up to, and including, 2.1.0 via the \u0027backup_file\u0027 parameter parameter. This makes it possible for authenticated attackers, with administrator-level access and above, to read the contents of arbitrary files on the server, which can contain sensitive information. The basename() normalization present in the handler only executes when the traversed target path does not exist, providing no protection against reads of existing files."
}
],
"metrics": [
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"version": "3.1"
}
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"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-22",
"description": "CWE-22 Improper Limitation of a Pathname to a Restricted Directory (\u0027Path Traversal\u0027)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-10T03:40:40.713Z",
"orgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
"shortName": "Wordfence"
},
"references": [
{
"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/50272c8a-2e23-490d-8865-68ae49228895?source=cve"
},
{
"url": "https://plugins.trac.wordpress.org/browser/wp-backitup/tags/2.1.0/lib/includes/handler_download.php#L77"
},
{
"url": "https://plugins.trac.wordpress.org/browser/wp-backitup/tags/2.1.0/lib/includes/handler_download.php#L73"
},
{
"url": "https://plugins.trac.wordpress.org/browser/wp-backitup/tags/2.1.0/lib/includes/handler_download.php#L30"
},
{
"url": "https://plugins.trac.wordpress.org/browser/wp-backitup/tags/2.1.0/lib/includes/class-wpbackitup-admin.php#L1391"
},
{
"url": "https://plugins.trac.wordpress.org/browser/wp-backitup/tags/2.0.0/lib/includes/handler_download.php#L77"
},
{
"url": "https://plugins.trac.wordpress.org/browser/wp-backitup/tags/2.0.0/lib/includes/handler_download.php#L73"
},
{
"url": "https://plugins.trac.wordpress.org/browser/wp-backitup/tags/2.0.0/lib/includes/handler_download.php#L30"
},
{
"url": "https://plugins.trac.wordpress.org/browser/wp-backitup/tags/2.0.0/lib/includes/class-wpbackitup-admin.php#L1391"
}
],
"timeline": [
{
"lang": "en",
"time": "2026-09-09T15:19:03.000Z",
"value": "Disclosed"
}
],
"title": "WP BackItUp Community Edition \u003c= 2.1.0 - Authenticated (Administrator+) Path Traversal to Arbitrary File Read via \u0027backup_file\u0027 Parameter"
}
},
"cveMetadata": {
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"assignerShortName": "Wordfence",
"cveId": "CVE-2026-18386",
"datePublished": "2026-09-10T03:40:40.713Z",
"dateReserved": "2026-07-30T12:57:05.405Z",
"dateUpdated": "2026-09-10T03:40:40.713Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"nvd": "{\"cve\":{\"id\":\"CVE-2026-18386\",\"sourceIdentifier\":\"security@wordfence.com\",\"published\":\"2026-09-10T04:17:48.437\",\"lastModified\":\"2026-09-10T04:17:48.437\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"The WP BackItUp Community Edition plugin for WordPress is vulnerable to Directory Traversal in all versions up to, and including, 2.1.0 via the \u0027backup_file\u0027 parameter parameter. This makes it possible for authenticated attackers, with administrator-level access and above, to read the contents of arbitrary files on the server, which can contain sensitive information. The basename() normalization present in the handler only executes when the traversed target path does not exist, providing no protection against reads of existing files.\"}],\"affected\":[{\"source\":\"security@wordfence.com\",\"affectedData\":[{\"vendor\":\"cssimmon\",\"product\":\"WP BackItUp Community Edition\",\"defaultStatus\":\"unaffected\",\"versions\":[{\"version\":\"0\",\"lessThanOrEqual\":\"2.1.0\",\"versionType\":\"semver\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security@wordfence.com\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N\",\"baseScore\":4.9,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"HIGH\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":1.2,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"security@wordfence.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-22\"}]}],\"references\":[{\"url\":\"https://plugins.trac.wordpress.org/browser/wp-backitup/tags/2.0.0/lib/includes/class-wpbackitup-admin.php#L1391\",\"source\":\"security@wordfence.com\"},{\"url\":\"https://plugins.trac.wordpress.org/browser/wp-backitup/tags/2.0.0/lib/includes/handler_download.php#L30\",\"source\":\"security@wordfence.com\"},{\"url\":\"https://plugins.trac.wordpress.org/browser/wp-backitup/tags/2.0.0/lib/includes/handler_download.php#L73\",\"source\":\"security@wordfence.com\"},{\"url\":\"https://plugins.trac.wordpress.org/browser/wp-backitup/tags/2.0.0/lib/includes/handler_download.php#L77\",\"source\":\"security@wordfence.com\"},{\"url\":\"https://plugins.trac.wordpress.org/browser/wp-backitup/tags/2.1.0/lib/includes/class-wpbackitup-admin.php#L1391\",\"source\":\"security@wordfence.com\"},{\"url\":\"https://plugins.trac.wordpress.org/browser/wp-backitup/tags/2.1.0/lib/includes/handler_download.php#L30\",\"source\":\"security@wordfence.com\"},{\"url\":\"https://plugins.trac.wordpress.org/browser/wp-backitup/tags/2.1.0/lib/includes/handler_download.php#L73\",\"source\":\"security@wordfence.com\"},{\"url\":\"https://plugins.trac.wordpress.org/browser/wp-backitup/tags/2.1.0/lib/includes/handler_download.php#L77\",\"source\":\"security@wordfence.com\"},{\"url\":\"https://www.wordfence.com/threat-intel/vulnerabilities/id/50272c8a-2e23-490d-8865-68ae49228895?source=cve\",\"source\":\"security@wordfence.com\"}]}}"
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
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.
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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.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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