CVE-2026-70486
Authenticated XSS in Open WebUI file-preview allows account takeover and possible RCE
Is CVE-2026-70486 being exploited?
Not confirmed. CVE-2026-70486 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 0.37% probability of exploitation in the next 30 days.
How severe is CVE-2026-70486?
CVE-2026-70486 is rated High with a CVSS score of 8.2. 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-2026-70486?
Yes. A fix has been recorded for CVE-2026-70486. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-70486 affect?
CVE-2026-70486 affects Open WebUI versions >=0.9.0 and <0.11.0 (terminal file-preview iframe). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-70486?
Upgrade Open WebUI to >=0.11.0, revoke exposed sessions, restrict terminal access.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated file-preview XSS can steal session tokens, enable account takeover; admin compromise may enable server-side code execution.
Immediate action required
- affected>= 0.9.0 and < 0.11.0
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.