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

high Affects studio-42/elfinder. Feed 2026.10.29.4, updated 2026-10-29; published 2026-08-31.

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

Package: studio-42/elfinder Composer
Affected versions: <2.1.70
Fixed in: 2.1.70
Severity: high CVSS 8.6
Exploitation: not on CISA KEV · EPSS 1% (46.0th percentile)
Published: 2026-08-31
Source: osv.dev

References

NVD record studio-42/elfinder advisories

Am I affected?

Find out in one command. phpwarden checks your composer.lock against this advisory and 20,000+ others, ranked by real-world exploitation (CISA KEV + EPSS). Free, offline, open data.

# PHP projects (recommended)
composer require --dev phpwarden/phpwarden
# then
vendor/bin/phpwarden deps composer.lock

# or, without Composer
pipx install phpwarden   &&   phpwarden deps composer.lock

Or keep it checked automatically: GitHub Action · pre-commit hook · GitLab CI · Laravel artisan command

Install docs How findings are ranked

Related advisories

CVE-2019-9194 critical elFinder command injection vulnerability in the PHP connector same package: studio-42/elfinder
CVE-2021-32682 critical elFinder before 2.1.59 contains multiple vulnerabilities leading to RCE same package: studio-42/elfinder
CVE-2022-26960 critical Path Traversal in Studio-42 elFinder through 2.1.60 same package: studio-42/elfinder
CVE-2021-43421 critical elFinder Unrestricted File Upload vulnerability same package: studio-42/elfinder
CVE-2022-27115 critical RCE in Studio-42 elFinder on Windows before 2.1.61 same package: studio-42/elfinder
CVE-2021-23394 high elFinder unsafe upload filtering leading to remote code execution same package: studio-42/elfinder