# CVE-2020-26564: XML external entity in n/a

> Attackers can exploit XML External Entity vulnerabilities in Opinio to read sensitive files or execute code via crafted survey imports.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 31 Jul 2021
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-rr3f-mhhr-6wv3

## What is CVE-2020-26564?

CVE-2020-26564 is a medium-severity vulnerability in n/a, published on 31 Jul 2021. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

ObjectPlanet Opinio before 7.15 allows XXE attacks via three steps: modify a .css file to have <!ENTITY content, create a .xml file for a generic survey template (containing a link to this .css file), and import this .xml file at the survey/admin/folderSurvey.do?action=viewImportSurvey['importFile'] URI. The XXE can then be triggered at a admin/preview.do?action=previewSurvey&surveyId= URI.

Weakness: CWE-611 (Improper Restriction of XML External Entity Reference)

## Which versions are affected by CVE-2020-26564?

It affects 1 product.


Products: Objectplanet Opinio.

## How do I fix CVE-2020-26564?

No fix has been published for CVE-2020-26564 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-26564 being exploited?

There is no known exploitation of CVE-2020-26564 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2023-4472](https://insights.sbomify.com/CVE-2023-4472/): Cryptographically weak PRNG in Opinio 7.22 (critical 9.8)
- [CVE-2020-26806](https://insights.sbomify.com/CVE-2020-26806/): File upload in n/a (high 8.8)
- [CVE-2020-26565](https://insights.sbomify.com/CVE-2020-26565/): Code injection in n/a (high 7.5)
- [CVE-2020-26563](https://insights.sbomify.com/CVE-2020-26563/): Cross-site scripting in n/a (medium 6.1)
- [CVE-2017-10798](https://insights.sbomify.com/CVE-2017-10798/): Cross-site scripting in n/a (medium 6.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-26564 and fix it if it is affected.

What it is: CVE-2020-26564 is a medium-severity vulnerability in n/a, published on 31 Jul 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-26564 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-2020-26564/ (Markdown: https://insights.sbomify.com/CVE-2020-26564/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-26564
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-26564
- OSV: https://osv.dev/vulnerability/CVE-2020-26564

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-26564/
Summaries are generated and may contain mistakes; the official description above is the record.