Spotweb up to 1.5.8 NZB handler runcommand SPOTTITLE os command injection

Summaryinfo

A vulnerability was found in Spotweb up to 1.5.8. It has been classified as critical. This issue affects the function runcommand of the component NZB handler. Performing a manipulation of the argument SPOTTITLE results in os command injection. This vulnerability is identified as CVE-2026-108546. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in Spotweb up to 1.5.8. It has been classified as critical. This affects the function runcommand of the component NZB handler. The manipulation of the argument SPOTTITLE with an unknown input leads to a os command injection vulnerability. CWE is classifying the issue as CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Spotweb through 1.5.8 contains an OS command injection vulnerability in the runcommand NZB handler that allows remote attackers to execute commands by publishing spots with malicious titles. Attackers can post self-signed spots over Usenet with shell metacharacters in the title, which are substituted unescaped for $SPOTTITLE and passed to exec() when a user downloads the spot, running commands as the Spotweb PHP process.

It is possible to read the advisory at hackmd.io. This vulnerability is uniquely identified as CVE-2026-108546 since 10/10/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/10/2026). The attack technique deployed by this issue is T1202 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Name

• Spotweb

Version

• 1.5.0
• 1.5.1
• 1.5.2
• 1.5.3
• 1.5.4
• 1.5.5
• 1.5.6
• 1.5.7
• 1.5.8

CPE 2.3info

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CPE 2.2info

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