CVE-2026-41318 Cross-site scripting in anything-llm
Attackers can inject malicious scripts via LLM-generated chart captions, leading to stored XSS and potential account takeover in shared workspaces.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-41318?
CVE-2026-41318 is a medium-severity cross-site scripting vulnerability in Mintplexlabs Anythingllm, published on 24 Apr 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
AnythingLLM is an application that turns pieces of content into context that any LLM can use as references during chatting. Prior to version 1.12.1, AnythingLLM's in-chat markdown renderer has an unsafe custom rule for images that interpolates the markdown image's `alt` text into an HTML `alt="..."` attribute without any HTML encoding. Every call-site in the app wraps `renderMarkdown(...)` with `DOMPurify.sanitize(...)` as defense-in-depth — except the `Chartable` component, which renders chart captions with no sanitization. The chart caption is the natural-language text the LLM emits around a `create-chart` tool call, so any attacker who can influence the LLM's output — most cheaply via indirect prompt injection in a shared workspace document, or directly if they can create a chart record in a multi-user workspace — can trigger stored DOM-level XSS in every other user's browser when they open that conversation. AnythingLLM chat history is loaded server-side via `GET /api/workspace/:slug/chats` and rendered directly into the chat UI. Version 1.12.1 contains a patch for this issue.
Which versions are affected by CVE-2026-41318?
It affects 1 product.
Products include Mintplexlabs Anythingllm.
How do I fix CVE-2026-41318?
No fix has been published for CVE-2026-41318 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-41318 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-41318 exists.
Other vulnerabilities in Mintplexlabs Anythingllm
- CVE-2024-3025 Path Traversal in mintplex-labs/anything-llm
- CVE-2024-0455 SSRF on AWS deployed instances of AnythingLLM via /metadata
- CVE-2026-32626 AnythingLLM has a Streaming Phase XSS to RCE via LLM Response Injection
- CVE-2024-3104 Remote Code Execution in mintplex-labs/anything-llm
- CVE-2024-3149 SSRF in mintplex-labs/anything-llm
Sources
Also known as GHSA-4q6m-qh3w-9gf5.