# CVE-2025-53490: Multiple XSS in CampaignEvents

> Cross-site scripting vulnerability in the MediaWiki CampaignEvents extension allows attackers to inject malicious scripts, potentially compromising user sessions.

- **Severity:** Medium 5.6 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 3 Jul 2025
- **Updated:** 10 Jul 2025
- **Also known as:** GHSA-9vrv-4cjj-vw3q

## What is CVE-2025-53490?

CVE-2025-53490 is a medium-severity cross-site scripting vulnerability in Wikimedia Foundation Mediawiki - CampaignEvents Extension, published on 3 Jul 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation Mediawiki - CampaignEvents Extension allows Cross-Site Scripting (XSS).This issue affects Mediawiki - CampaignEvents Extension: from 1.43.X before 1.43.2.

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

## Which versions are affected by CVE-2025-53490?

It affects 1 product.


Products: Jly Campaignevents.

## How do I fix CVE-2025-53490?

No fix has been published for CVE-2025-53490 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-53490 being exploited?

There is no known exploitation of CVE-2025-53490 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-53490 and fix it if it is affected.

What it is: CVE-2025-53490 is a medium-severity cross-site scripting vulnerability in Wikimedia Foundation Mediawiki - CampaignEvents Extension, published on 3 Jul 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-53490 in the wild and no public exploit code.

Affected product: Wikimedia Foundation Mediawiki - CampaignEvents Extension. 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-2025-53490/ (Markdown: https://insights.sbomify.com/CVE-2025-53490/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-53490
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-53490
- OSV: https://osv.dev/vulnerability/CVE-2025-53490

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-53490/
Summaries are generated and may contain mistakes; the official description above is the record.