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CVE-2026-105106

Status: DeferredHigh (8.8)—
Severity8.8High · CVSS 3.1
Exploitation probability1.61 %higher than 76% of CVEs
Active exploitationNonot in the CISA catalog
Public exploitNot knownno public code found

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.

CVSS

Base score
8.8
Version
3.1
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days
1.61 %
Percentile among all scored CVEs
76
Score date
10/21/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

Vector AV:N/PR:L/UI:N: un usuario de staff autenticado inyecta metacaracteres en jobid, que llega sin validar a system() y ejecuta comandos del SO (CWE-78).

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

ATT&CK mitigations that cover these techniques

Privileged Account ManagementDisable or Remove Feature or ProgramVulnerability ScanningThreat Intelligence ProgramRestrict Web-Based ContentNetwork Segmentation

Affected technologies (1)

⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.

Koha — KohaAI

CWEs

References

Show 5 references

Raw JSON (NVD)

Show
{
  "id": "CVE-2026-105106",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-105106",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-10-14T17:55:56.921737Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c",
        "cvssData": {
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          "baseScore": 8.8,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
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        "exploitabilityScore": 2.8
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  "affected": [
    {
      "source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c",
      "affectedData": [
        {
          "vendor": "Koha Community",
          "product": "Koha",
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "lessThan": "24.11.00",
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            {
              "status": "affected",
              "version": "24.11.00",
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            {
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  "published": "2026-10-14T08:17:03.587",
  "references": [
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      "source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c"
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      "url": "https://download.koha-community.org/",
      "source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c"
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    {
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-28739",
      "source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c"
    },
    {
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-30076",
      "source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c"
    },
    {
      "url": "https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=42674",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
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  "vulnStatus": "Deferred",
  "weaknesses": [
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      "source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c",
      "description": [
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  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    }
  ],
  "lastModified": "2026-10-15T15:53:08.287",
  "sourceIdentifier": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c"
}