High severity · published Jul 13, 2026
CVE-2026-15541
will-moss Isaiah Master Websocket server.go Server.Handle authorization
7.3
CVSS
0.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 45% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
IS
Isaiah · will-moss
1.36.0; 1.36.1; 1.36.2; 1.36.3; 1.36.4; 1.36.5; +4 more · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-15541
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-15541
github.com
https://github.com/will-moss/isaiah/
github.com
https://github.com/will-moss/isaiah/issues/34
github.com
https://github.com/will-moss/isaiah/pull/35
vuldb.com
https://vuldb.com/cve/CVE-2026-15541
vuldb.com
https://vuldb.com/submit/855074
vuldb.com
https://vuldb.com/vuln/377891
More from Isaiah
7.3
CVE-2026-15542
will-moss Isaiah Websocket Connection Authentication main.go improper authentication