Authorization Flaw in github.com/drakkan/sftpgo/v2 (CVE-2026-103028)
Summary
Vulnerability in github.com/drakkan/sftpgo/v2 (CVE-2026-103028). Risk of unauthorized operations or information disclosure. Exploitable via denied_patterns. Mitigation: upgrade to 2.7.6 or later.
Original description
The description as published by the source.
Summary
File pattern filters (denied_patterns / allowed_patterns) were evaluated on the destination of a copy only. A user holding the copy permission could copy a file denied by the filters to a permitted name and then read it. A recursive directory copy reproduced the contents of a restricted directory under a path where the filters do not deny them, and the hide policy was affected in the same way: a file reported as missing by stat and by directory listings could still be copied.
Details
An authenticated user can read the contents of files that the file pattern filters are configured to deny them. Nothing else is bypassed: the home directory, the virtual folder layout and the per-directory permissions are all still enforced, and both ends of the copy are paths the account can already reach. No access to other accounts and no administrative capability.
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-103028 has been found in github.com/drakkan/sftpgo/v2.
Attackers can target a specific entry point like denied_patterns over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 4.3/10.
What to do: upgrade github.com/drakkan/sftpgo/v2 to 2.7.6 or later.
If unsure, ask your IT team or search "github.com/drakkan/sftpgo/v2 CVE-2026-103028" on the vendor's site.
CVE-2026-103028 (github.com/drakkan/sftpgo/v2) — CWE-863 / CVSS v3 4.3
Attack vector: remote (network-reachable) / no user interaction
Attack surface: denied_patterns / allowed_patterns
Patched: 2.7.6 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
Incorrect authorization (CWE-863) exists in github.com/drakkan/sftpgo/v2. Attackers reach the vulnerable code path via denied_patterns.
Check the vendor advisory for the affected versions of github.com/drakkan/sftpgo/v2. Attack surface: denied_patterns / allowed_patterns.
Severity: Medium (CVSS 4.3/10). Risk of unauthorized operations or information disclosure.
Update to 2.7.6.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'github.com/drakkan/sftpgo/v2' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
grep -r 'github.com/drakkan/sftpgo/v2' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
github.com/drakkan/sftpgo/v2を grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade github.com/drakkan/sftpgo/v2 to 2.7.6ステージング環境で 2.7.6 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
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3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- advisory nvd.nist.gov
- package github.com
- web github.com
- web github.com
- web github.com
- web github.com