Security readout for executives and security teams
Plain-English summary
CVE-2026-27611 means password-protected shared file links in FileBrowser Quantum may not actually protect the file. Anyone who has the share link can obtain a direct download link without entering the password. This creates confidentiality risk for organizations using the product to share sensitive files.
Executive priority
Treat as a high-priority confidentiality issue if FileBrowser Quantum is used for sensitive file sharing. Prioritize upgrade and review of existing shared links. Business urgency is highest where links were shared outside trusted teams or with third parties.
Technical view
Before 1.1.3-stable and 1.2.6-beta, FileBrowser Quantum exposes a direct download link in share details for password-protected file shares. The issue is classified under information exposure and authentication/protection bypass weaknesses. CVSS v4.0 score is 7.1, with network access, low complexity, no privileges, and user interaction required.
Likely exposure
Exposure is limited to FileBrowser Quantum deployments running versions earlier than 1.1.3-stable, or beta versions from 1.2.0-beta before 1.2.6-beta, where password-protected file sharing is used. Risk increases if share links were sent externally or broadly distributed.
Exploitation context
The source advisory describes bypass by possessing a share link. No KEV listing or provided source indicates active exploitation in the wild. The vulnerability is easy to trigger from a network perspective, but depends on access to a valid share link.
Researcher notes
Public sources identify the root cause as share details returning a direct download link despite password protection. The fix is referenced in commit c51b0ee9738fa4599b409f47c5bf820ef31b4fe1. Do not assume compromise solely from exposure; validate versions, sharing usage, and link distribution.
Mitigation direction
- Upgrade FileBrowser Quantum to 1.1.3-stable or 1.2.6-beta or later.
- Review and rotate previously shared password-protected links containing sensitive data.
- Restrict access to shared links where possible until upgraded.
- Check the vendor advisory for any additional operational guidance.
Validation and detection
- Inventory FileBrowser Quantum instances and record exact versions.
- Confirm whether password-protected file sharing is enabled or used.
- Verify deployed versions are 1.1.3-stable, 1.2.6-beta, or later.
- Review logs and sharing records for sensitive links distributed before patching.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-200: Information exposure and cloud metadata lookup
Information exposure and SSRF weaknesses can make discovery, cloud metadata, and credential material review relevant. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCWE-287: Credential and account abuse lookup
Authentication and credential weaknesses can make valid-account abuse and credential telemetry useful review starting points. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCWE-288: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCredential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-27611 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.1 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N——Primary CVE scoreVulnerability scoring details
Base CVSS 4.0 score
7.1HighVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/gtsteffaniak/filebrowser/security/advisories/GHSA-8vrh-3pm2-v4v6CVE reference · x_refsource_CONFIRM
- https://github.com/gtsteffaniak/filebrowser/commit/c51b0ee9738fa4599b409f47c5bf820ef31b4fe1CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Exposure of Sensitive Information to an Unauthorized Actor
Exposure of Sensitive Information to an Unauthorized Actor represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.
Improper Authentication
Improper Authentication represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.
Authentication Bypass Using an Alternate Path or Channel
Authentication Bypass Using an Alternate Path or Channel represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.