# CVE-2023-31145: Reflected XSS vulnerability in CollaboraOnline > Reflected XSS in Collabora Online allows attackers to bypass CSP and perform trivial account takeover via malicious code injection. - **Severity:** Medium 4.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Over the internet - **Victim action needed:** A user has to click or open something - **Fix available:** No - **Published:** 15 May 2023 - **Updated:** 22 Jan 2025 - **Also known as:** GHSA-rqj2-2c2x-gjmm ## What is CVE-2023-31145? CVE-2023-31145 is a medium-severity cross-site scripting vulnerability in CollaboraOnline online, published on 15 May 2023. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link. ### Official description Collabora Online is a collaborative online office suite based on LibreOffice technology. This vulnerability report describes a reflected XSS vulnerability with full CSP bypass in Nextcloud installations using the recommended bundle. The vulnerability can be exploited to perform a trivial account takeover attack. The vulnerability allows attackers to inject malicious code into web pages, which can be executed in the context of the victim's browser session. This means that an attacker can steal sensitive data, such as login credentials or personal information, or perform unauthorized actions on behalf of the victim, such as modifying or deleting data. In this specific case, the vulnerability allows for a trivial account takeover attack. An attacker can exploit the vulnerability to inject code into the victim's browser session, allowing the attacker to take over the victim's account without their knowledge or consent. This can lead to unauthorized access to sensitive information and data, as well as the ability to perform actions on behalf of the victim. Furthermore, the fact that the vulnerability bypasses the Content Security Policy (CSP) makes it more dangerous, as CSP is an important security mechanism used to prevent cross-site scripting attacks. By bypassing CSP, attackers can circumvent the security measures put in place by the web application and execute their malicious code. This issue has been patched in versions 22.05.13, 21.11.9, and 6.4.27. Users are advised to upgrade. There are no known workarounds for this vulnerability. Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation) ## Which versions are affected by CVE-2023-31145? It affects 1 product. Products: Collabora Online. ## How do I fix CVE-2023-31145? No fix has been published for CVE-2023-31145 yet. Limit exposure of the affected software until one is available. ## Is CVE-2023-31145 being exploited? There is no known exploitation of CVE-2023-31145 in the wild and no public exploit code. ## Other vulnerabilities in CollaboraOnline online - [CVE-2026-110447](https://insights.sbomify.com/CVE-2026-110447/): Collabora Online – Built-in CODE Server OS Command Injection (critical 9.2, exploited in the wild) - [CVE-2021-32744](https://insights.sbomify.com/CVE-2021-32744/): Unauthenticated attacker could gain access to currently open files (critical 9.8) - [CVE-2021-43817](https://insights.sbomify.com/CVE-2021-43817/): Reflected Cross-Site-Scripting vulnerability in Collabora Online (high 8.2) - [CVE-2021-32745](https://insights.sbomify.com/CVE-2021-32745/): Reflected Cross-Site-Scripting vulnerability (high 7.3) - [CVE-2025-66208](https://insights.sbomify.com/CVE-2025-66208/): Configuration-Dependent RCE (OS Command Injection) in richdocumentscode proxy (high 7.2) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2023-31145 and fix it if it is affected. What it is: CVE-2023-31145 is a medium-severity cross-site scripting vulnerability in CollaboraOnline online, published on 15 May 2023. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link. Exploitation: There is no known exploitation of CVE-2023-31145 in the wild and no public exploit code. Affected product: CollaboraOnline online. No package-level version data is available, so check the vendor advisory linked from the reference page. Task: 1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies. 2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it. 3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead. 4. Run the tests and summarise what changed and why. 5. If nothing in the project is affected, say so and change nothing. Reference: https://insights.sbomify.com/CVE-2023-31145/ (Markdown: https://insights.sbomify.com/CVE-2023-31145/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2023-31145 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-31145 - OSV: https://osv.dev/vulnerability/CVE-2023-31145 --- From sbomify Insights: https://insights.sbomify.com/CVE-2023-31145/ Summaries are generated and may contain mistakes; the official description above is the record.