CVE-2026-105106High· 8.8▾ MidnightPoC available

Koha is vulnerable to OS command injection in the Task Scheduler deletion path

▾ Midnight zone — Critical, or high with PoC / in-the-wild

Depth score61/ 100 · Elevated

impact 48.4 · likelihood 0.4 · exploitation 12

⚡ Agent-ready:Raw markdown ↗JSON ↗

Proof of concept

A public proof-of-concept already exists for this vulnerability — see Exploit availability below.

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Published

Oct 14, 2026

Updated

Oct 15, 2026

CVSS

8.8

Vendor

Koha Community

Product

Koha

CWE

CWE-78

Depth score

61 · Elevated

EPSS

1.9% · p79

Platforms

—

Source

NVD

Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

decided 2026-10-14

Exploitation: poc
Automatable: no
Technical impact: total

Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.

EPSS history

Exploit-prediction probability, daily snapshots since Oct 14.

1.6% → 1.9%▲ 0.3%

Timeline

Disclosure to exploitation, from the record and what we observed since indexing it.

5 events · 12 days

Oct 14, 2026Published
Disclosed via NVD
Oct 14, 2026EPSS first tracked
1.6%
Oct 15, 2026Record revised
Last analysed / modified upstream
Oct 15, 2026Public exploit observed
Exploit / PoC code exists
Oct 26, 2026EPSS peak
1.6% → 1.9%

Koha Community CWE-78 #nvd #cve.org #exploit-available

Affected

Koha < 24.11.00
Koha >= 24.11.00 < 24.11.20
Koha >= 25.05.00 < 25.05.15
Koha >= 25.11.00 < 25.11.09
Koha >= 26.05.00 < 26.05.04

Full technical detail▾

Overview

Koha is vulnerable to OS command injection in the Task Scheduler deletion path. The tools/scheduler.pl handler accepts the jobid request parameter for op=cud-delete and passes it to C4::Scheduler::remove_at_job without validating it. Schedule::At::remove substitutes the supplied job ID into an atrm command string without quoting or escaping it and executes the command through a single-argument system() call, which invokes the shell. An authenticated staff user with the tools => schedule_tasks permission can therefore execute arbitrary operating-system commands as the Koha web/application user by supplying shell metacharacters in jobid. The issue is fixed in Koha 24.11.20, 25.05.15, 25.11.09, and 26.05.04, and in the 26.11 development branch.

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

References

Change history

Field changes observed since this record was first indexed.

Oct 15, 2026Public exploit / PoC published

Related vulnerabilities

Connected by shared product, vendor, weakness, or advisory.

#nvd#cve.org#exploit-available

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