CVE-2026-24058Public exploitNetwork attack vectorHinoki check available

User impersonation via stale SSH session identity

Published Jan 22, 2026 · Updated Jan 22, 2026

Authentication bypass in Charmbracelet Soft Serve 0.11.2 and earlier allows remote authenticated users to impersonate any user over SSH. PublicKeyHandler stores the user resolved from an offered key in session context, while AuthenticationMiddleware fails to replace that identity after the offer fails. Exploitation requires the victim's public key and an attacker-controlled valid key; impersonating an administrator grants full administrative access.

CVSS severity9.8
Critical
EPSS probability0.55%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Authentication bypass in Charmbracelet Soft Serve 0.11.2 and earlier allows remote authenticated users to impersonate any user over SSH. PublicKeyHandler stores the user resolved from an offered key in session context, while AuthenticationMiddleware fails to replace that identity after the offer fails. Exploitation requires the victim's public key and an attacker-controlled valid key; impersonating an administrator grants full administrative access.

The record

CVE
CVE-2026-24058
Published
Jan 22, 2026
Updated
Jan 22, 2026
Vendor
Charmbracelet
Product
Soft Serve
Classifications
CWE-289, T1068
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 22, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.11.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Charmbracelet · Soft Serveversion=< 0.11.3

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.1GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 11, 2026Sep 17, 2026
Latest reporting daySep 17, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-289Authentication Bypass by Alternate Name
T1068Exploitation for Privilege Escalation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo