# CVE-2025-1939: Tapjacking in Android Custom Tabs using transition animations

> Attackers can use transition animations in Android Custom Tabs to trick users into granting sensitive permissions via tapjacking.

- **Severity:** Low 3.9 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 4 Mar 2025
- **Updated:** 13 Apr 2026
- **Also known as:** GHSA-x9h6-qwxm-528g

## What is CVE-2025-1939?

CVE-2025-1939 is a low-severity vulnerability in Mozilla Firefox, published on 4 Mar 2025. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

Android apps can load web pages using the Custom Tabs feature. This feature supports a transition animation that could have been used to trick a user into granting sensitive permissions by hiding what the user was actually clicking. This vulnerability was fixed in Firefox 136.

Weakness: CWE-359 (Exposure of Private Personal Information to an Unauthorized Actor)

## Which versions are affected by CVE-2025-1939?

It affects 1 product.


Products: Mozilla Firefox.

## How do I fix CVE-2025-1939?

Upgrade to a fixed version.

## Is CVE-2025-1939 being exploited?

There is no known exploitation of CVE-2025-1939 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-2025-1939 and fix it if it is affected.

What it is: CVE-2025-1939 is a low-severity vulnerability in Mozilla Firefox, published on 4 Mar 2025. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2025-1939 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-2025-1939/ (Markdown: https://insights.sbomify.com/CVE-2025-1939/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-1939
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-1939
- OSV: https://osv.dev/vulnerability/CVE-2025-1939

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-1939/
Summaries are generated and may contain mistakes; the official description above is the record.