CVE-2021-25975 Publify - Stored Cross-Site Scripting (XSS) due to Unrestricted File Upload

What is CVE-2021-25975?

CVE-2021-25975 is a medium-severity cross-site scripting vulnerability in publify_core, published on 10 Nov 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

Official description

In publify, versions v8.0 to v9.2.4 are vulnerable to stored XSS as a result of an unrestricted file upload. This issue allows a user with “publisher” role to inject malicious JavaScript via the uploaded html file.

Weakness: CWE-79

Which versions are affected by CVE-2021-25975?

3 open source packages ship an affected version, including publify_core and publify. It affects 1 product.

Products include Publify Project Publify.

How do I fix CVE-2021-25975?

Upgrade publify_core to 9.2.5 or later.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2021-25975 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-25975 exists.

Other vulnerabilities in publify_core

• CVE-2022-1810 Authorization Bypass Through User-Controlled Key in publify/publify Critical 9.9
• CVE-2022-1811 Unrestricted Upload of File with Dangerous Type in publify/publify Critical 9.1
• CVE-2022-1553 Leaking password protected articles content due to improper access control in publify/publify High 8.8
• CVE-2023-0299 Improper Input Validation in publify/publify High 8.4
• CVE-2023-0569 Weak Password Requirements in publify/publify High 8.1

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BIT-publify-2021-25975, GHSA-3h7v-wqw7-ff28.