File deletion via cross-site state-changing GET requests
Published Apr 21, 2026 · Updated Apr 21, 2026
CSRF in goshs 2.0.0-beta.4 through 2.0.0-beta.5 allows remote attackers to delete files or create directories through a victim's browser. The ?delete and ?mkdir GET dispatch paths call os.RemoveAll() and os.MkdirAll() without CSRF tokens or Origin or Referer validation. Exploitation requires a victim already authenticated with HTTP basic auth to visit attacker-controlled content; the demonstrated consequences are file deletion and directory creation.
Summary
What happened
CSRF in goshs 2.0.0-beta.4 through 2.0.0-beta.5 allows remote attackers to delete files or create directories through a victim's browser. The ?delete and ?mkdir GET dispatch paths call os.RemoveAll() and os.MkdirAll() without CSRF tokens or Origin or Referer validation. Exploitation requires a victim already authenticated with HTTP basic auth to visit attacker-controlled content; the demonstrated consequences are file deletion and directory creation.
The record
- CVE
- CVE-2026-40883
- Published
- Apr 21, 2026
- Updated
- Apr 21, 2026
- Vendor
- Patrick Hener
- Product
- goshs
- Classifications
- CWE-352, T1204.001
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 21, 2026CVE publishedPublication date reported by the CVE source.
- Apr 21, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=>= 2.0.0-beta.4, < 2.0.0-beta.6
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
- GHSA browser CSRF proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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