CVE-2025-55204
RCE in Muffon desktop via crafted muffon:// link (pre-2.3.0).
WAF coverage: Reflected or stored XSS. WAF signatures match script tags and event handlers.
Also consider: remove eval sinks · RASP · CSP · output encoding
Is CVE-2025-55204 being exploited?
Not confirmed. CVE-2025-55204 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.70% probability of exploitation in the next 30 days.
How severe is CVE-2025-55204?
CVE-2025-55204 is rated High with a CVSS score of 8.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2025-55204?
Yes. A fix has been recorded for CVE-2025-55204. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2025-55204 affect?
CVE-2025-55204 affects Muffon desktop app <2.3.0 (cross-platform). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2025-55204?
Upgrade to Muffon 2.3.0 or later
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution on victim desktop via malicious URL handler; attacker gains code execution with minimal interaction.
Immediate action required
- affected< 2.3.0
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.