Secuno
ENNL
Book demo

CVE-2026-70492

8.7 HIGHPublic exploitEPSS 0.33%
  1. Published4 Aug 2026

Description

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.10.0 until 0.11.0, src/lib/components/chat/Messages/Markdown/KatexRenderer.svelte could store and render a chat message whose math block makes KaTeX fail with a stack overflow instead of a parse error. The catch branch fell back to inserting the original math source into the page as HTML through {@html} rather than as text, so script in the message runs in the browser of whoever views it, including shared chats and channels. The viewer's session token in localStorage can be stolen, and an administrator viewer can have their account taken over. This issue is fixed in 0.11.0.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionRequired
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

Affected products

Openwebui Open Webui≥ 0.10.0 < 0.11.0

Remediation

Fixed in
Openwebui Open Webui≥ 0.11.0

References

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

CVE-2026-936598.7
Concrete CMS Community Store before 2.7.8 renders customer-supplied order fields…
CVE-2026-888258.8
The iGMS Direct Booking WordPress plugin before 2.0 does not authorise or escape its…
CVE-2026-851278.8
The VikBooking Hotel Booking Engine & PMS WordPress plugin before 1.8.15 does not…
CVE-2026-851228.8
The Easy Form Builder by WhiteStudio WordPress plugin before 4.2.0 does not validate a…
CVE-2026-839468.2
Improper neutralization of input during web page generation ('cross-site scripting') in…
CVE-2026-776158.7
Paella Player is a set of libraries to create a multi stream video player. Prior to…

Frequently asked

Is CVE-2026-70492 being actively exploited?

CVE-2026-70492 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.33%.

How severe is CVE-2026-70492?

CVE-2026-70492 has a CVSS 3.1 base score of 8.7, rated high. EPSS estimates a 0.33% probability of exploitation.

Which products are affected by CVE-2026-70492?

Affected products include Openwebui Open Webui.

How do I fix CVE-2026-70492?

Upgrade affected software to a fixed version, for example Openwebui Open Webui 0.11.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-70492 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

See how prioritisation worksBook a demo

Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.