CVE-2026-18855 (GCVE-0-2026-18855)
Vulnerability from cvelistv5 – Published: 2026-08-15 18:25 – Updated: 2026-08-15 18:25
VLAI
EPSS
VEX
Title
Link Library <= 7.9.4 - Unauthenticated Arbitrary File Deletion via link_url Parameter
Summary
The Link Library plugin for WordPress is vulnerable to arbitrary file deletion due to insufficient file path validation in the ll_delete_link_fields function in all versions up to, and including, 7.9.4 This makes it possible for unauthenticated attackers to delete arbitrary files on the server, which can easily lead to remote code execution when the right file is deleted (such as wp-config.php). Exploitation requires the administrator to have enabled the 'Delete local file on link deletion' plugin option (disabled by default) and to subsequently permanently delete the attacker-submitted link, which is a routine moderation action.
Severity
9.1 (Critical)
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 | |
|---|---|---|---|
| jackdewey | Link Library |
Affected:
0 , ≤ 7.9.4
(semver)
|
{
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"product": "Link Library",
"vendor": "jackdewey",
"versions": [
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"status": "affected",
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}
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],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "nudien"
}
],
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"lang": "en",
"value": "The Link Library plugin for WordPress is vulnerable to arbitrary file deletion due to insufficient file path validation in the ll_delete_link_fields function in all versions up to, and including, 7.9.4 This makes it possible for unauthenticated attackers to delete arbitrary files on the server, which can easily lead to remote code execution when the right file is deleted (such as wp-config.php). Exploitation requires the administrator to have enabled the \u0027Delete local file on link deletion\u0027 plugin option (disabled by default) and to subsequently permanently delete the attacker-submitted link, which is a routine moderation action."
}
],
"metrics": [
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"cvssV3_1": {
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"baseSeverity": "CRITICAL",
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"version": "3.1"
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"problemTypes": [
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"description": "CWE-22 Improper Limitation of a Pathname to a Restricted Directory (\u0027Path Traversal\u0027)",
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}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-15T18:25:57.238Z",
"orgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
"shortName": "Wordfence"
},
"references": [
{
"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/41327dfa-db64-476a-a263-7bd4f69fb857?source=cve"
},
{
"url": "https://plugins.trac.wordpress.org/browser/link-library/tags/7.9.4/link-library-admin.php#L7874"
},
{
"url": "https://plugins.trac.wordpress.org/browser/link-library/tags/7.9.4/link-library-admin.php#L7865"
},
{
"url": "https://plugins.trac.wordpress.org/browser/link-library/tags/7.9.4/usersubmission.php#L52"
},
{
"url": "https://plugins.trac.wordpress.org/browser/link-library/tags/7.9.4/usersubmission.php#L476"
},
{
"url": "https://plugins.trac.wordpress.org/browser/link-library/tags/7.9.4/link-library.php#L2288"
},
{
"url": "https://plugins.trac.wordpress.org/changeset?reponame=\u0026new=3646361%40link-library%2Ftags%2F7.9.5\u0026old=3626573%40link-library%2Ftags%2F7.9.4"
},
{
"url": "https://plugins.trac.wordpress.org/changeset/3646360/link-library/trunk/link-library-admin.php"
},
{
"url": "https://plugins.trac.wordpress.org/changeset?old_path=%2Flink-library/tags/7.9.4\u0026new_path=%2Flink-library/tags/7.9.5"
}
],
"timeline": [
{
"lang": "en",
"time": "2026-08-04T16:14:01.000Z",
"value": "Vendor Notified"
},
{
"lang": "en",
"time": "2026-08-14T20:49:12.000Z",
"value": "Disclosed"
}
],
"title": "Link Library \u003c= 7.9.4 - Unauthenticated Arbitrary File Deletion via link_url Parameter"
}
},
"cveMetadata": {
"assignerOrgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
"assignerShortName": "Wordfence",
"cveId": "CVE-2026-18855",
"datePublished": "2026-08-15T18:25:57.238Z",
"dateReserved": "2026-08-04T15:58:36.475Z",
"dateUpdated": "2026-08-15T18:25:57.238Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-18855",
"date": "2026-08-16",
"epss": "0.01206",
"percentile": "0.65723"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2026-18855\",\"sourceIdentifier\":\"security@wordfence.com\",\"published\":\"2026-08-15T19:16:32.160\",\"lastModified\":\"2026-08-15T19:16:32.160\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"The Link Library plugin for WordPress is vulnerable to arbitrary file deletion due to insufficient file path validation in the ll_delete_link_fields function in all versions up to, and including, 7.9.4 This makes it possible for unauthenticated attackers to delete arbitrary files on the server, which can easily lead to remote code execution when the right file is deleted (such as wp-config.php). Exploitation requires the administrator to have enabled the \u0027Delete local file on link deletion\u0027 plugin option (disabled by default) and to subsequently permanently delete the attacker-submitted link, which is a routine moderation action.\"}],\"affected\":[{\"source\":\"security@wordfence.com\",\"affectedData\":[{\"vendor\":\"jackdewey\",\"product\":\"Link Library\",\"defaultStatus\":\"unaffected\",\"versions\":[{\"version\":\"0\",\"lessThanOrEqual\":\"7.9.4\",\"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:N/UI:N/S:U/C:N/I:H/A:H\",\"baseScore\":9.1,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":5.2}]},\"weaknesses\":[{\"source\":\"security@wordfence.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-22\"}]}],\"references\":[{\"url\":\"https://plugins.trac.wordpress.org/browser/link-library/tags/7.9.4/link-library-admin.php#L7865\",\"source\":\"security@wordfence.com\"},{\"url\":\"https://plugins.trac.wordpress.org/browser/link-library/tags/7.9.4/link-library-admin.php#L7874\",\"source\":\"security@wordfence.com\"},{\"url\":\"https://plugins.trac.wordpress.org/browser/link-library/tags/7.9.4/link-library.php#L2288\",\"source\":\"security@wordfence.com\"},{\"url\":\"https://plugins.trac.wordpress.org/browser/link-library/tags/7.9.4/usersubmission.php#L476\",\"source\":\"security@wordfence.com\"},{\"url\":\"https://plugins.trac.wordpress.org/browser/link-library/tags/7.9.4/usersubmission.php#L52\",\"source\":\"security@wordfence.com\"},{\"url\":\"https://plugins.trac.wordpress.org/changeset/3646360/link-library/trunk/link-library-admin.php\",\"source\":\"security@wordfence.com\"},{\"url\":\"https://plugins.trac.wordpress.org/changeset?old_path=%2Flink-library/tags/7.9.4\u0026new_path=%2Flink-library/tags/7.9.5\",\"source\":\"security@wordfence.com\"},{\"url\":\"https://plugins.trac.wordpress.org/changeset?reponame=\u0026new=3646361%40link-library%2Ftags%2F7.9.5\u0026old=3626573%40link-library%2Ftags%2F7.9.4\",\"source\":\"security@wordfence.com\"},{\"url\":\"https://www.wordfence.com/threat-intel/vulnerabilities/id/41327dfa-db64-476a-a263-7bd4f69fb857?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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