elFinder: SSRF protection bypass via DNS rebinding in the `fsock_get_contents()` fallback

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-81889
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-31 21:17:52 UTC
Updated2026-09-03 19:17:29 UTC
DescriptionelFinder 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.

Risk And Classification

Primary CVSS: v3.1 8.6 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

EPSS: 0.003340000 probability, percentile 0.261240000 (date 2026-09-03)

Problem Types: CWE-918 | CWE-918 CWE-918: Server-Side Request Forgery (SSRF)

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.6HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
3.1CNADECLARED8.6HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Studio-42 ElFinder affected < 2.1.70 Not specified

References

ReferenceSourceLinkTags
github.com/Studio-42/elFinder/commit/191372c1bbebbd36fb55af79a84b9984861... [email protected] github.com
github.com/Studio-42/elFinder/releases/tag/2.1.70 [email protected] github.com
github.com/Studio-42/elFinder/security/advisories/GHSA-8x3q-jpjh-qh5c 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/Studio-42/elFinder/commit/6d997386cd0f1abab4706c220b46b0aea0e... [email protected] github.com
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