CVE-2026-15541: will-moss Isaiah Master Websocket server.go Server.Handle authorization

Severity: high (CVSS 7.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-13 · updated 2026-10-24
Weakness: CWE-862

Description

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.

Affected products

will-moss Isaiah: 1.36.0, 1.36.1, 1.36.2, 1.36.3, 1.36.4, 1.36.5 (+4)

References

https://github.com/will-moss/isaiah/
https://github.com/will-moss/isaiah/issues/34
https://github.com/will-moss/isaiah/pull/35
https://vuldb.com/cve/CVE-2026-15541
https://vuldb.com/submit/855074
https://vuldb.com/vuln/377891
https://vuldb.com/vuln/377891/cti

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