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TI-2026-76878 Aliases CVE-2026-113411GHSA-5mgq-c58r-mh8w

Improper authorization in Nerimity Desktop custom URL scheme handler

Priority MEDIUM 57CWE-285Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Passive
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
Low · Low · Low
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-285.

Summary

Nerimity Desktop up to 2.2.2 is affected by improper authorization in the window open handler for custom URL schemes, in the shell.openExternal function of src/mainWindow.js. The url argument is not properly authorized before it is passed to shell.openExternal (CWE-939). A remote attacker can manipulate the url argument, but user interaction is required. A public exploit has been published.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

A vulnerability was found in Nerimity Desktop up to 2.2.2. Affected by this issue is the function shell.openExternal of the file src/mainWindow.js of the component Window Open Handler. The manipulation of the argument url results in improper authorization in handler for custom url scheme. The attack can be executed remotely. The exploit has been made public and could be used. Upgrading to version 2.3.3 can resolve this issue. The patch is identified as f4df21bbc290f6c1956d899cf4da9e963074a6e4. You should upgrade the affected component. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00287 21st percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Fixed Desktop (Nerimity): 2.3.3

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

VendorProductAffected versionsFixed inStatusSource
NerimityDesktop2.2.0; 2.2.1; 2.2.22.3.3Patch availableCNA
  • Desktop VendorNerimity Affected 2.2.0; 2.2.1; 2.2.2 Fixed in 2.3.3 Patch available CNA

CPE names CNA · 1

CPEVersionsRoleVendor
cpe:2.3:a:nerimity:desktop:*:*:*:*:*:*:*:*——Nerimity
  • cpe:2.3:a:nerimity:desktop:*:*:*:*:*:*:*:* Versions — — ·Nerimity

Remediation

Upgrade Nerimity Desktop to version 2.3.3, which fixes the issue with patch f4df21bbc290f6c1956d899cf4da9e963074a6e4.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

  • Fix · CNA Desktop (Nerimity) Fixed in 2.3.3

Timeline

  1. 2026-10-20 Threatist record created from CVE-2026-113411
  2. 2026-10-20 Alias added: GHSA-5mgq-c58r-mh8w
  3. 2026-10-23 CISA SSVC decision points changed
  4. 2026-10-23 Priority changed: LOW → MEDIUM

References

Exploit 1

Patch 2

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences