CVE-2024-26566Public exploitNetwork attack vector

Privilege escalation via username-only JWT validation

Published Mar 7, 2024 · Updated Jul 9, 2026

Authentication bypass in ODS-IM CuteHttpFileServer 3.1 and earlier allows remote attackers to assume arbitrary user privileges via a forged JWT. The password verification component accepts a JWT after checking only its username claim and never verifies the corresponding password. An unauthenticated attacker who can submit a forged cookie can log in as a privileged account and rename, delete, or move server files.

CVSS severity8.2
High
EPSS probability0.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in ODS-IM CuteHttpFileServer 3.1 and earlier allows remote attackers to assume arbitrary user privileges via a forged JWT. The password verification component accepts a JWT after checking only its username claim and never verifies the corresponding password. An unauthenticated attacker who can submit a forged cookie can log in as a privileged account and rename, delete, or move server files.

The record

CVE
CVE-2024-26566
Published
Mar 7, 2024
Updated
Jul 9, 2026
Vendor
ODS-IM
Product
CuteHttpFileServer
Classifications
CWE-288, T1606.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 7, 2024CVE publishedPublication date reported by the CVE source.
  2. Jul 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=0 <=3.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ODS-IM · CuteHttpFileServerversion=0 <=3.1

Published CVSS scores

8.2CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-288Authentication Bypass Using an Alternate Path or Channel
T1606.001Forge Web Credentials: Web Cookies

Public exploit references

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

Technologies

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Your stack

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