CVE-2026-30934
Stored XSS in FileBrowser Quantum via share metadata
Is CVE-2026-30934 being exploited?
Not confirmed. CVE-2026-30934 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 0.35% probability of exploitation in the next 30 days.
How severe is CVE-2026-30934?
CVE-2026-30934 is rated High with a CVSS score of 8.9. 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-2026-30934?
Yes. A fix has been recorded for CVE-2026-30934. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-30934 affect?
CVE-2026-30934 affects FileBrowser Quantum < 1.3.1-beta and < 1.2.2-stable. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-30934?
Upgrade to fixed versions (1.3.1-beta or 1.2.2-stable).
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Stored XSS in share metadata lets attacker run scripts in a victim's browser via /public/share, risking cookie/session theft.
Patch when possible
- affected>= 1.3.0-beta and < 1.3.1-beta
- affected< 1.2.2-stable
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.