CVE-2026-56398
Stored XSS in OAuth profile-image handling lets attackers steal tokens and take over accounts.
Is CVE-2026-56398 being exploited?
Not confirmed. CVE-2026-56398 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 0.64% probability of exploitation in the next 30 days.
How severe is CVE-2026-56398?
CVE-2026-56398 is rated High. 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-2026-56398?
Yes. A fix has been recorded for CVE-2026-56398. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-56398 affect?
CVE-2026-56398 affects Open WebUI < 0.9.5, Open WebUI OAuth profile image endpoint. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-56398?
Upgrade Open WebUI to 0.9.5+ and block/validate SVG uploads; apply Content-Security-Policy.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated users can upload attacker-controlled SVGs as profile images causing stored XSS, token theft and account takeover via same-origin script execution.
Immediate action required
- affected< 0.9.5
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.