What is CVE-2025-55030?

CVE-2025-55030 is a medium-severity vulnerability in Mozilla Firefox, classified under Weak Password Recovery Mechanism for Forgotten Password. CVSS score: 6.1/10. Published 2025-08-19.

How severe is CVE-2025-55030?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Vulnerability in Mozilla Firefox

CVE-2025-55030

Firefox for iOS would not respect a Content-Disposition header of type Attachment and would incorrectly display the content inline rather than downloading, potentially allowing for XSS attacks. This vulnerability was fixed in Firefox for iOS 142.

Published 2025-08-19 · last modified 2026-09-30.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.002 (4.3th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 4th percentile — 4.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Mozilla Firefox
Mozilla Firefox For iOS — versions 142

Weakness classification (CWE)

CWE-640 — Weak Password Recovery Mechanism for Forgotten Password

References

bugzilla.mozilla.org/show_bug.cgi (Permissions Required, Issue Tracking)
www.mozilla.org/security/advisories/mfsa2025-68/ (Vendor Advisory)

Frequently asked questions

What is CVE-2025-55030?: CVE-2025-55030 is a medium-severity vulnerability in Mozilla Firefox, classified under Weak Password Recovery Mechanism for Forgotten Password. CVSS score: 6.1/10. Published 2025-08-19.
How severe is CVE-2025-55030?: Medium severity. CVSS v3 base score is 6.1 out of 10.