CVE-2026-45315
XSS via crafted file upload in Open WebUI prior to 0.9.3.
Is CVE-2026-45315 being exploited?
Not confirmed. CVE-2026-45315 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 0.19% probability of exploitation in the next 30 days.
How severe is CVE-2026-45315?
CVE-2026-45315 is rated High with a CVSS score of 8.7. 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-2026-45315?
Yes. A fix has been recorded for CVE-2026-45315. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-45315 affect?
CVE-2026-45315 affects Open WebUI self-hosted AI platform (pre-0.9.3). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-45315?
Upgrade to 0.9.3+; review and harden file-upload handling and auth controls.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Client-side XSS; attacker-uploaded HTML runs in Open WebUI origin, risking session hijack.
Immediate action required
- affected< 0.9.3
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.