# CVE-2025-55030: Content-Disposition headers incorrectly ignored for some MIME types

> Firefox for iOS ignored Content-Disposition headers, allowing inline display of attachments and potential XSS attacks.

- **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:** No
- **Published:** 19 Aug 2025
- **Updated:** 13 Apr 2026
- **Also known as:** GHSA-jhw6-rcq8-2vxj

## What is CVE-2025-55030?

CVE-2025-55030 is a medium-severity cross-site scripting vulnerability in Mozilla Firefox, published on 19 Aug 2025. 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

Firefox for iOS would not respect a Content-Disposition header of type Attachment and would incorrectly display the content inline rather than downloading, potentially allowing for XSS attacks. This vulnerability was fixed in Firefox for iOS 142.

Weakness: CWE-640 (Weak Password Recovery Mechanism for Forgotten Password)

## Which versions are affected by CVE-2025-55030?

It affects 1 product.


Products: Mozilla Firefox.

## How do I fix CVE-2025-55030?

No fix has been published for CVE-2025-55030 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-55030 being exploited?

There is no known exploitation of CVE-2025-55030 in the wild and no public exploit code.

## Other vulnerabilities in Mozilla Firefox

- [CVE-2019-11708](https://insights.sbomify.com/CVE-2019-11708/): Mozilla Firefox and Thunderbird Sandbox Escape (critical 10.0, exploited in the wild)
- [CVE-2010-3765](https://insights.sbomify.com/CVE-2010-3765/): Mozilla Multiple Products Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2022-26486](https://insights.sbomify.com/CVE-2022-26486/): Mozilla Firefox Use-After-Free (critical 9.6, exploited in the wild)
- [CVE-2022-26485](https://insights.sbomify.com/CVE-2022-26485/): Mozilla Firefox Use-After-Free (high 8.8, exploited in the wild)
- [CVE-2019-11707](https://insights.sbomify.com/CVE-2019-11707/): Mozilla Firefox and Thunderbird Type Confusion (high 8.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-55030 and fix it if it is affected.

What it is: CVE-2025-55030 is a medium-severity cross-site scripting vulnerability in Mozilla Firefox, published on 19 Aug 2025. 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-2025-55030 in the wild and no public exploit code.

Affected product: Mozilla Firefox. 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-2025-55030/ (Markdown: https://insights.sbomify.com/CVE-2025-55030/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-55030
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-55030
- OSV: https://osv.dev/vulnerability/CVE-2025-55030

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-55030/
Summaries are generated and may contain mistakes; the official description above is the record.