CVE-2026-36759Public exploitNetwork attack vector

Internal resource disclosure via unvalidated upgrade URI

Published Apr 30, 2026 · Updated Apr 30, 2026

SSRF in Halo 2.22.14 allows remote authenticated users to read internal HTTP resources through a crafted theme-upgrade request. The UpgradeFromUri handler passes an unvalidated URI to DefaultReactiveUrlDataBufferFetcher.fetch(), which follows redirects and issues WebClient GET requests without blocking internal hosts. Ordinary user privileges suffice; requests are limited to HTTP GET, but internal service responses are returned directly.

CVSS severity6.5
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in Halo 2.22.14 allows remote authenticated users to read internal HTTP resources through a crafted theme-upgrade request. The UpgradeFromUri handler passes an unvalidated URI to DefaultReactiveUrlDataBufferFetcher.fetch(), which follows redirects and issues WebClient GET requests without blocking internal hosts. Ordinary user privileges suffice; requests are limited to HTTP GET, but internal service responses are returned directly.

The record

CVE
CVE-2026-36759
Published
Apr 30, 2026
Updated
Apr 30, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-918, CAPEC-664, T1046
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 30, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5CISA ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
CAPEC-664Server Side Request Forgery
T1046Network Service Discovery

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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