CVE-2026-48777
Path traversal in FileBrowser Quantum allows moving/renaming files via public share.
Is CVE-2026-48777 being exploited?
Not confirmed. CVE-2026-48777 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 0.45% probability of exploitation in the next 30 days.
How severe is CVE-2026-48777?
CVE-2026-48777 is rated Critical with a CVSS score of 9.3. 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-2026-48777?
Yes. A fix has been recorded for CVE-2026-48777. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-48777 affect?
CVE-2026-48777 affects FileBrowser Quantum (self-hosted). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-48777?
Patch to 1.3.3-stable or 1.4.2-beta; revoke/reissue public shares.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Public share with Modify enables path traversal to move/copy/rename arbitrary files in the share owner's root.
Immediate action required
- affected< 1.3.3-stable
- affected>= 1.4.0-beta and < 1.4.2-beta
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.