CVE-2023-25728

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-06-02 · updated 2026-10-24
Weakness: CWE-203

Description

The <code>Content-Security-Policy-Report-Only</code> header could allow an attacker to leak a child iframe's unredacted URI when interaction with that iframe triggers a redirect. This vulnerability affects Firefox < 110, Thunderbird < 102.8, and Firefox ESR < 102.8.

Affected products

Mozilla Firefox: before 110.0 — fixed in 110.0
Mozilla Firefox ESR: before 102.8 — fixed in 102.8
Mozilla Thunderbird: before 102.8 — fixed in 102.8

How to fix

Upgrade to a fixed version: Mozilla Firefox 110.0; Mozilla Firefox ESR 102.8; Mozilla Thunderbird 102.8. Check the vendor advisory for mitigations.

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1790345
https://www.mozilla.org/security/advisories/mfsa2023-05/
https://www.mozilla.org/security/advisories/mfsa2023-06/
https://www.mozilla.org/security/advisories/mfsa2023-07/
https://bugzilla.mozilla.org/show_bug.cgi?id=1790345
https://www.mozilla.org/security/advisories/mfsa2023-05/
https://www.mozilla.org/security/advisories/mfsa2023-06/
https://www.mozilla.org/security/advisories/mfsa2023-07/
https://bugzilla.mozilla.org/show_bug.cgi?id=1790345

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