CVE-2023-25741

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2023-06-02 · updated 2026-06-17
Weakness: CWE-203

Description

When dragging and dropping an image cross-origin, the image's size could potentially be leaked. This behavior was shipped in 109 and caused web compatibility problems as well as this security concern, so the behavior was disabled until further review. This vulnerability affects Firefox < 110.

Affected products

Mozilla Firefox: before 110.0 — fixed in 110.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 110.0. Check the vendor advisory for mitigations.

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1437126
https://bugzilla.mozilla.org/show_bug.cgi?id=1812611
https://bugzilla.mozilla.org/show_bug.cgi?id=1813376
https://www.mozilla.org/security/advisories/mfsa2023-05/
https://bugzilla.mozilla.org/show_bug.cgi?id=1437126
https://bugzilla.mozilla.org/show_bug.cgi?id=1812611
https://bugzilla.mozilla.org/show_bug.cgi?id=1813376
https://www.mozilla.org/security/advisories/mfsa2023-05/

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