CVE-2026-48851
Analyzed Analyzed - Analysis Complete
PuTTY TELNET Proxy Authentication Trust Misuse

Publication date: 2026-05-25

Last updated on: 2026-05-27

Assigner: MITRE

Description
PuTTY 0.77 before 0.84 uses a copy of the PuTTY icon as a trust indication for TELNET data but the trust status is not cleared between proxy authentication and the main session.
CVSS Scores
EPSS Scores
Probability:
Percentile:
Meta Information
Published
2026-05-25
Last Modified
2026-05-27
Generated
2026-06-15
AI Q&A
2026-05-26
EPSS Evaluated
2026-06-14
NVD
CVE-2026-48851
EUVD
EUVD-2026-31731
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
putty putty From 0.77 (inc) to 0.84 (exc)
Helpful Resources
Exploitability
CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-451 The user interface (UI) does not properly represent critical information to the user, allowing the information - or its source - to be obscured or spoofed. This is often a component in phishing attacks.
Attack-Flow Graph
AI Quick Actions
Instant insights powered by AI
Executive Summary

This vulnerability exists in PuTTY versions 0.77 before 0.84. PuTTY uses a copy of its icon as a trust indication for TELNET data. However, the trust status represented by this icon is not cleared between proxy authentication and the main session, which can lead to incorrect trust assumptions.

Impact Analysis

Because the trust status is not properly cleared between proxy authentication and the main session, users or systems might mistakenly trust TELNET data that should not be trusted. This could potentially lead to security issues such as accepting malicious data or unauthorized access during the session.

Chat Assistant
Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-48851. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70
EPSS Chart