CVE-2026-42335Public exploitNetwork attack vector

Authenticated SSRF via discrepant URL parsing

Published May 26, 2026 · Updated May 26, 2026

SSRF in MaxKB before 2.8.1 allows remote authenticated users to access internal network services through the OSS URL-fetch endpoint. The validator's urlparse call treats the host after a backslash and at-sign as public, while the requests client sends the same malformed URL to the preceding internal host. A valid MaxKB account is required, and successful requests can reach internal HTTP services but do not by themselves grant host code execution.

CVSS severity6.3
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in MaxKB before 2.8.1 allows remote authenticated users to access internal network services through the OSS URL-fetch endpoint. The validator's urlparse call treats the host after a backslash and at-sign as public, while the requests client sends the same malformed URL to the preceding internal host. A valid MaxKB account is required, and successful requests can reach internal HTTP services but do not by themselves grant host code execution.

The record

CVE
CVE-2026-42335
Published
May 26, 2026
Updated
May 26, 2026
Vendor
KubeOperator
Product
MaxKB
Classifications
CWE-918, T1090.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 26, 2026CVE publishedPublication date reported by the CVE source.
  2. May 26, 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=< 2.8.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

KubeOperator · MaxKBversion=< 2.8.1

Published CVSS scores

6.3GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:L/SA: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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1090.001Internal Proxy

Public exploit references

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

Technologies

Your stack

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Your stack

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