CVE-2026-50767Public exploitNetwork attack vector

Stored script execution via raw check-in message

Published Jun 26, 2026 · Updated Jun 26, 2026

Stored XSS in Koha Library Management System 25.11 and earlier allows remote authenticated users to inject scripts via checkinmsg. The item-type template passes the stored check-in message through html_line_break and then marks it raw, causing browser-executable markup to be rendered without HTML encoding. Administrator access is required to store the payload, and another user's browser must render the affected content for script execution in Koha's origin.

CVSS severity5.4
Medium
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Koha Library Management System 25.11 and earlier allows remote authenticated users to inject scripts via checkinmsg. The item-type template passes the stored check-in message through html_line_break and then marks it raw, causing browser-executable markup to be rendered without HTML encoding. Administrator access is required to store the payload, and another user's browser must render the affected content for script execution in Koha's origin.

The record

CVE
CVE-2026-50767
Published
Jun 26, 2026
Updated
Jun 26, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1203
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jun 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.4CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

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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