CVE-2024-28740Public exploitNetwork attack vector

Admin-session compromise via stored customization script

Published Aug 6, 2024 · Updated Aug 21, 2024

Stored cross-site scripting in Koha 23.05 and earlier allows remote attackers to run JavaScript through Additional Contents. The additional-contents.pl add_validate operation accepts content_default from a crafted URL and stores it as an HTML customization without neutralizing script-capable markup. Execution requires a staff administrator to open the link or later visit the stored customization while authenticated; the script can act through that session, including changing the administrator password or chaining to command execution when the separate task-scheduler flaw or plugin uploads are reachable.

CVSS severity9.6
Critical
EPSS probability0.71%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in Koha 23.05 and earlier allows remote attackers to run JavaScript through Additional Contents. The additional-contents.pl add_validate operation accepts content_default from a crafted URL and stores it as an HTML customization without neutralizing script-capable markup. Execution requires a staff administrator to open the link or later visit the stored customization while authenticated; the script can act through that session, including changing the administrator password or chaining to command execution when the separate task-scheduler flaw or plugin uploads are reachable.

The record

CVE
CVE-2024-28740
Published
Aug 6, 2024
Updated
Aug 21, 2024
Vendor
Koha Community
Product
Koha
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 6, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 21, 2024Record 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 <=23.05

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Koha Community · Kohaversion=0 <=23.05

Published CVSS scores

6.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
9.6NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

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-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.001Malicious Link

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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