CVE-2026-81889

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Source
https://cve.org/CVERecord?id=CVE-2026-81889
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-81889.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-81889
Aliases
Published
2026-08-31T20:25:27.456Z
Modified
2026-09-02T03:47:27.952306596Z
Severity
  • 8.6 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N CVSS Calculator
Summary
elFinder: SSRF protection bypass via DNS rebinding in the `fsock_get_contents()` fallback
Details

elFinder is an open-source file manager for web, written in JavaScript using jQuery UI. Prior to 2.1.70, elFinder URL uploads in php/elFinder.class.php can bypass server-side request forgery protections when PHP cURL is unavailable because validateaddress() validates $info['ip'], but getremotecontents() selects fsockgetcontents(), which connects to $arr['host'] and performs a second DNS resolution. An attacker able to submit a URL upload can use DNS rebinding to have the first resolution return a public address and the connection resolution return a loopback or private address, causing the internal HTTP response body to be stored as an uploaded file and made readable through elFinder. After a successful fetch, getheaders($url, true) separately requests the original hostname without reusing the validated and pinned connection, creating an additional blind server-side request forgery path even when curlgetcontents() is selected. This issue is fixed in version 2.1.70.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/81xxx/CVE-2026-81889.json",
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-918"
    ]
}
References

Affected packages

Git / github.com/studio-42/elfinder

Affected ranges

Type
GIT
Repo
https://github.com/studio-42/elfinder
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
191372c1bbebbd36fb55af79a84b9984861390ff
Fixed
6d997386cd0f1abab4706c220b46b0aea0ecff51
Fixed
e7ea668fd569fc9903fb1c431d47d58f2daad2f2
Database specific
Show details 
{
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ],
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "2.1.70"
        }
    ]
}

Affected versions

1.*
1.0.1
2.*
2.0-beta
2.1.0
2.1.1
2.1.10
2.1.11
2.1.12
2.1.13
2.1.14
2.1.15
2.1.16
2.1.17
2.1.18
2.1.19
2.1.2
2.1.20
2.1.21
2.1.22
2.1.23
2.1.24
2.1.25
2.1.26
2.1.27
2.1.28
2.1.29
2.1.3
2.1.30
2.1.31
2.1.32
2.1.33
2.1.34
2.1.35
2.1.36
2.1.37
2.1.38
2.1.39
2.1.4
2.1.40
2.1.41
2.1.42
2.1.43
2.1.44
2.1.45
2.1.46
2.1.47
2.1.48
2.1.49
2.1.5
2.1.50
2.1.51
2.1.52
2.1.53
2.1.54
2.1.55
2.1.56
2.1.57
2.1.58
2.1.59
2.1.6
2.1.60
2.1.61
2.1.62
2.1.63
2.1.64
2.1.65
2.1.66
2.1.67
2.1.68
2.1.69
2.1.7
2.1.8
2.1.9

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-81889.json"