# CVE-2020-25789: Cross-site scripting in n/a

> Attackers can execute arbitrary JavaScript via crafted SVG documents in cached URLs, potentially compromising user sessions in Tiny Tiny RSS.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/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:** Yes
- **Published:** 19 Sep 2020
- **Updated:** 22 Dec 2025
- **Also known as:** DEBIAN-CVE-2020-25789, GHSA-63f3-68q8-wr22, UBUNTU-CVE-2020-25789

## What is CVE-2020-25789?

CVE-2020-25789 is a medium-severity cross-site scripting vulnerability in n/a, published on 19 Sep 2020. 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

An issue was discovered in Tiny Tiny RSS (aka tt-rss) before 2020-09-16. The cached_url feature mishandles JavaScript inside an SVG document.

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

## Which versions are affected by CVE-2020-25789?

It affects 1 product.


Products: Tt-Rss Tiny Tiny Rss.

## How do I fix CVE-2020-25789?

Upgrade to a fixed version.

## Is CVE-2020-25789 being exploited?

There is no known exploitation of CVE-2020-25789 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2020-25787](https://insights.sbomify.com/CVE-2020-25787/): Server-side request forgery in n/a (critical 9.8)
- [CVE-2017-16896](https://insights.sbomify.com/CVE-2017-16896/): SQL injection in n/a (critical 9.8)
- [CVE-2020-25788](https://insights.sbomify.com/CVE-2020-25788/): Cross-site scripting in n/a (high 8.1)
- [CVE-2021-28373](https://insights.sbomify.com/CVE-2021-28373/): Auth bypass in n/a (high 7.5)
- [CVE-2017-1000035](https://insights.sbomify.com/CVE-2017-1000035/): Cross-site scripting in n/a (medium 6.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-25789 and fix it if it is affected.

What it is: CVE-2020-25789 is a medium-severity cross-site scripting vulnerability in n/a, published on 19 Sep 2020. 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-2020-25789 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-2020-25789/ (Markdown: https://insights.sbomify.com/CVE-2020-25789/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-25789
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-25789
- OSV: https://osv.dev/vulnerability/CVE-2020-25789

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-25789/
Summaries are generated and may contain mistakes; the official description above is the record.