CVE-2026-26379Public exploitNetwork attack vector

Authenticated internal service discovery via SSRF

Published Jun 3, 2026 · Updated Jun 3, 2026

SSRF in Koha 25.11 and earlier allows remote authenticated users to scan internal networks through configured Z39.50/SRU servers. The configuration workflow stores an attacker-chosen host and port, and cataloguing/z3950_search.pl then opens the server-side connection and reveals whether it timed out or failed. Access to create a server entry and launch a cataloguing search is required; the demonstrated consequence is discovery of listening internal services, not code execution.

CVSS severity6.5
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in Koha 25.11 and earlier allows remote authenticated users to scan internal networks through configured Z39.50/SRU servers. The configuration workflow stores an attacker-chosen host and port, and cataloguing/z3950_search.pl then opens the server-side connection and reveals whether it timed out or failed. Access to create a server entry and launch a cataloguing search is required; the demonstrated consequence is discovery of listening internal services, not code execution.

The record

CVE
CVE-2026-26379
Published
Jun 3, 2026
Updated
Jun 3, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-918, CAPEC-664, T1046
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 3, 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:N/UI:N/S:U/C:L/I:L/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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