# CVE-2011-4923: Cross-site scripting in n/a

> Remote attackers can inject arbitrary web script or HTML via the num parameter in the log file viewer, requiring user interaction to execute.

- **Severity:** Medium 4.3 (`AV:N/AC:M/Au:N/C:N/I:P/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:** Yes
- **Published:** 18 Feb 2012
- **Updated:** 7 Aug 2024
- **Also known as:** DEBIAN-CVE-2011-4923, GHSA-3cx2-p7rj-x3rq

## What is CVE-2011-4923?

CVE-2011-4923 is a medium-severity cross-site scripting vulnerability in n/a, published on 18 Feb 2012. 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

Cross-site scripting (XSS) vulnerability in View.pm in BackupPC 3.0.0, 3.1.0, 3.2.0, 3.2.1, and possibly earlier allows remote attackers to inject arbitrary web script or HTML via the num parameter in a view action to index.cgi, related to the log file viewer, a different vulnerability than CVE-2011-3361.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2011-4923?

It affects 1 product.


Products: Backuppc Backuppc.

## How do I fix CVE-2011-4923?

Upgrade to a fixed version.

## Is CVE-2011-4923 being exploited?

There is no known exploitation of CVE-2011-4923 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2009-3369](https://insights.sbomify.com/CVE-2009-3369/): Missing authorization in n/a (high 8.5)
- [CVE-2011-3361](https://insights.sbomify.com/CVE-2011-3361/): Cross-site scripting in n/a (medium 4.3)
- [CVE-2011-5081](https://insights.sbomify.com/CVE-2011-5081/): Cross-site scripting in n/a (medium 4.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2011-4923 and fix it if it is affected.

What it is: CVE-2011-4923 is a medium-severity cross-site scripting vulnerability in n/a, published on 18 Feb 2012. 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-2011-4923 in the wild and no public exploit code.

Affected product: n/a. 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-2011-4923/ (Markdown: https://insights.sbomify.com/CVE-2011-4923/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2011-4923
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2011-4923
- OSV: https://osv.dev/vulnerability/CVE-2011-4923

---
From sbomify Insights: https://insights.sbomify.com/CVE-2011-4923/
Summaries are generated and may contain mistakes; the official description above is the record.