Email Notification Handler Vulnerability in NASA-GCN Product
CVE-2026-123664

5.3MEDIUM

Key Information:

Vendor

Nasa-gcn

Status
Gcn.nasa.gov
Vendor
CVE Published:
6 November 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-123664?

A security flaw in the NASA-GCN Email Notification Handler allows for improper authorization through manipulation of the Recipient argument in the /user/email file. This vulnerability can be exploited remotely, potentially leading to unauthorized access and actions. The product follows a rolling release strategy, making specific version tracking challenging, and a pull request to address this issue is pending acceptance.

Affected Version(s)

gcn.nasa.gov b299b562af665878964b981a459f0a9c04b11adf

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-123664 - Proof of Concept

References

https://vuldb.com/vuln/431788
vdb-entrytechnical-description
https://vuldb.com/vuln/431788/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-123664
third-party-advisory

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

NirvanaOn (VulDB User)
VulDB CNA Team
.