Security readout for executives and security teams
Plain-English summary
Swing Music before 2.1.4 lets any logged-in user, even non-admins, browse directories outside the intended music folders. This can expose server file names and potentially sensitive local files visible to the application account. The issue is fixed in version 2.1.4.
Executive priority
Treat as a timely patch for any shared or internet-accessible Swing Music instance. Business risk is primarily unintended disclosure from the host filesystem, not system takeover based on current public evidence.
Technical view
CVE-2026-23877 is a directory traversal and access-control flaw in Swing Music’s list_folders() function exposed through the /folder/dir-browser endpoint. The CVSS 4.0 score is 5.3. Attack requirements are low, but exploitation requires authentication. Reported impact is limited to confidentiality, with no integrity or availability impact stated.
Likely exposure
Self-hosted Swing Music deployments running versions earlier than 2.1.4 are affected. Exposure is higher where untrusted or broadly shared user accounts can authenticate to the application.
Exploitation context
The provided sources do not report active exploitation, and the CVE is not marked as CISA KEV. The vulnerability is remotely reachable over the network by authenticated users and does not require user interaction.
Researcher notes
Evidence identifies CWE-25 and CWE-284 in list_folders() for /folder/dir-browser. The advisory states arbitrary server filesystem browsing by authenticated non-admin users before 2.1.4. No public source in the bundle confirms exploitation in the wild.
Mitigation direction
- Upgrade Swing Music to version 2.1.4 or later.
- Restrict Swing Music accounts to trusted users until upgraded.
- Review vendor advisory and commit details for deployment-specific guidance.
Validation and detection
- Confirm the installed Swing Music version is 2.1.4 or later.
- Verify non-admin users cannot browse outside intended music directories.
- Review application access logs for unusual directory browsing activity.
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-25: 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 lookupCWE-284: Authorization and privilege behavior lookup
Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. 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 lookupFile access behavior lookup
The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-23877 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
- Medium
- CVSS
- 5.3 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/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:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N——Primary CVE scoreVulnerability scoring details
Base CVSS 4.0 score
5.3MediumVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/swingmx/swingmusic/security/advisories/GHSA-pj88-9xww-gxmhCVE reference · x_refsource_CONFIRM
- https://github.com/swingmx/swingmusic/commit/9a915ca62af1502b9550722df82f5d432cb73de3CVE 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.
Path Traversal: '/../filedir'
Path Traversal: '/../filedir' represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.
Improper Access Control
Improper Access Control represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.