will-moss Isaiah Master Websocket server.go Server.Handle authorization
Priority MEDIUM 64CWE-862Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- Low · Low · Low
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-862.
Summary
A flaw has been found in will-moss Isaiah up to 1.36.9. The impacted element is the function Server.Handle of the file app/server/server/server.go of the component Master Websocket Handler. Executing a manipulation of the argument Agent can lead to missing authorization. It is possible to launch the attack remotely. The pull request to fix this issue awaits acceptance.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00543 45th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| will-moss | Isaiah | 1.36.0; 1.36.1; 1.36.2; 1.36.3; 1.36.4; 1.36.5; 1.36.6; 1.36.7; 1.36.8; 1.36.9 | — | No fix listed | CNA |
- Isaiah Vendorwill-moss Affected 1.36.0; 1.36.1; 1.36.2; 1.36.3; 1.36.4; 1.36.5; 1.36.6; 1.36.7; 1.36.8; 1.36.9 Fixed in — No fix listed CNA
CPE names CNA · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:will-moss:isaiah:*:*:*:*:*:*:*:* | — | — | — |
- cpe:2.3:a:will-moss:isaiah:*:*:*:*:*:*:*:* Versions — — ·—
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-15541
- 2026-10-03 Alias added: GHSA-ch9v-gm7f-9q33
References
More will-moss vulnerabilities
- TI-2026-13081 will-moss Isaiah Websocket Connection Authentication main.go improper authentication CVSS 4.0MEDIUM 6.9
Sources
- CVE-2026-15541 · CVE Program
- CVE-2026-15541 · NVD
- FIRST EPSS
- GHSA-ch9v-gm7f-9q33 · GitHub Advisory Database · CC BY 4.0
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