What’s Vulnerable › Vulnerabilities

CVE-2023-6869

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-12-19 · updated 2026-06-17

Description

A `&lt;dialog>` element could have been manipulated to paint content outside of a sandboxed iframe. This could allow untrusted content to display under the guise of trusted content. This vulnerability affects Firefox < 121.

Affected products

• Mozilla Firefox: before 121.0 — fixed in 121.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 121.0. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1799036
• https://security.gentoo.org/glsa/202401-10
• https://www.mozilla.org/security/advisories/mfsa2023-56/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1799036
• https://security.gentoo.org/glsa/202401-10
• https://www.mozilla.org/security/advisories/mfsa2023-56/

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