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CVE-2026-81889

CVE-2026-81889 · elFinder: SSRF protection bypass via DNS rebinding in the `fsock_get_contents()` fallback

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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 validate_address() validates $info['ip'], but get_remote_contents() selects fsock_get_contents(), which connects to $arr['host'] and performs a second DNS resolution. An attacker able to submit a URL upload can use DNS rebinding to have the first resolution return a public address and the connection resolution return a loopback or private address, causing the internal HTTP response body to be stored as an uploaded file and made readable through elFinder. After a successful fetch, get_headers($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 curl_get_contents() is selected. This issue is fixed in version 2.1.70.

CVSS 8.6 · Hoch · EPSS 0,5% · Korrektur verfügbar

Veröffentlicht
Aktualisiert

Technologie-Stack: php

Betroffene Produkte und Versionen

  • elfinder

    Softwareversionen
    • < 2.1.70: Betroffen

    Keine Korrektur veröffentlicht

  • studio-42/elfinder Packagist

    Softwareversionen
    • 2.0.3
    • 2.0.4
    • 2.0.5
    • 2.0.6
    • 2.0.7
    • 2.0.8
    • 2.0.9
    • 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
    Betroffene Versionsbereiche
    • ECOSYSTEM: < 2.1.70

    Auf 2.1.70 aktualisieren

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