CVE-2023-26482

Scope of workflow operations is not validated in nextcloud server

Description

Nextcloud server is an open source home cloud implementation. In affected versions a missing scope validation allowed users to create workflows which are designed to be only available for administrators. Some workflows are designed to be RCE by invoking defined scripts, in order to generate PDFs, invoking webhooks or running scripts on the server. Due to this combination depending on the available apps the issue can result in a RCE at the end. It is recommended that the Nextcloud Server is upgraded to 24.0.10 or 25.0.4. Users unable to upgrade should disable app `workflow_scripts` and `workflow_pdf_converter` as a mitigation.

Category

9.0
CVSS
Severity: Critical
CVSS 3.1 •
EPSS 70.48% Top 5%
Vendor Advisory github.com
Affected: nextcloud security-advisories
Published at:
Updated at:

References

Link Tags
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-h3c9-cmh8-7qpj vendor advisory
https://github.com/nextcloud/server/commit/5a06b50b10cc9278bbe68bbf897a0c4aeb0c4e60 patch

Frequently Asked Questions

What is the severity of CVE-2023-26482?
CVE-2023-26482 has been scored as a critical severity vulnerability.
How to fix CVE-2023-26482?
To fix CVE-2023-26482, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2023-26482 being actively exploited in the wild?
It is possible that CVE-2023-26482 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~70% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2023-26482?
CVE-2023-26482 affects nextcloud security-advisories.
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