CVE-2025-1935: XSS
First published: Tue Mar 04 2025(Updated: )
A web page could trick a user into setting that site as the default handler for a custom URL protocol.
Credit: security@mozilla.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Firefox | <136 | |
| Firefox ESR | <128.8 | |
| Thunderbird | <128.8 | 128.8 |
| Firefox | <136 | 136 |
| Firefox ESR | <128.8 | 128.8 |
| Thunderbird | <136 | 136 |
| debian/firefox | 136.0.1-1 | |
| debian/firefox-esr | <=115.14.0esr-1~deb11u1<=128.5.0esr-1~deb12u1 | 128.8.0esr-1~deb11u1 128.8.0esr-1~deb12u1 128.8.0esr-1 |
| debian/thunderbird | <=1:115.12.0-1~deb11u1<=1:128.5.0esr-1~deb12u1 | 1:128.8.0esr-1~deb11u1 1:128.8.0esr-1~deb12u1 1:128.8.0esr-1 |
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Reference Links
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-1935
- https://nvd.nist.gov/vuln/detail/CVE-2025-1935
- https://launchpad.net/bugs/cve/CVE-2025-1935
- https://security-tracker.debian.org/tracker/CVE-2025-1935
- https://ubuntu.com/security/CVE-2025-1935
- https://bugzilla.mozilla.org/show_bug.cgi?id=1866661
- https://www.mozilla.org/en-US/security/advisories/mfsa2025-14/
- https://www.mozilla.org/en-US/security/advisories/mfsa2025-16/
- https://www.mozilla.org/security/advisories/mfsa2025-14/
- https://www.mozilla.org/security/advisories/mfsa2025-16/
- https://www.mozilla.org/security/advisories/mfsa2025-17/
- https://www.mozilla.org/security/advisories/mfsa2025-18/
- https://www.mozilla.org/en-US/security/advisories/mfsa2025-17/
- https://www.mozilla.org/en-US/security/advisories/mfsa2025-14/#CVE-2025-1935
- https://www.mozilla.org/en-US/security/advisories/mfsa2025-16/#CVE-2025-1935
- https://www.mozilla.org/en-US/security/advisories/mfsa2025-18/#CVE-2025-1935
- https://www.mozilla.org/en-US/security/advisories/mfsa2025-18/
- https://access.redhat.com/errata/RHSA-2025:2359
- https://access.redhat.com/errata/RHSA-2025:2452
- https://access.redhat.com/errata/RHSA-2025:2481
- https://access.redhat.com/errata/RHSA-2025:2480
- https://access.redhat.com/errata/RHSA-2025:2479
- https://access.redhat.com/errata/RHSA-2025:2485
- https://access.redhat.com/errata/RHSA-2025:2484
- https://access.redhat.com/errata/RHSA-2025:2486
- https://access.redhat.com/errata/RHSA-2025:2699
- https://access.redhat.com/errata/RHSA-2025:2708
- https://bugzilla.redhat.com/show_bug.cgi?id=2349792
Parent vulnerabilities
(Appears in the following advisories)
Peer vulnerabilities
(Found alongside the following vulnerabilities)
Frequently Asked Questions
What is the severity of CVE-2025-1935?
CVE-2025-1935 is considered a medium severity vulnerability due to its potential to manipulate user settings.
How do I fix CVE-2025-1935?
To resolve CVE-2025-1935, update your Firefox to version 136 or Firefox ESR to version 128.8.
Which versions of Firefox are affected by CVE-2025-1935?
CVE-2025-1935 affects Firefox versions prior to 136 and Firefox ESR versions prior to 128.8.
What type of attack does CVE-2025-1935 represent?
CVE-2025-1935 represents a social engineering attack that can change the default URL protocol handler.
Is CVE-2025-1935 restricted to specific operating systems?
CVE-2025-1935 affects the Firefox browser on multiple operating systems including Windows, macOS, and Linux.
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