# CVE-2026-103243: LightLLM through 1.2.0 Server-Side Request Forgery via multimodal endpoints

> Unauthenticated attackers can exploit LightLLM multimodal endpoints to perform server-side request forgery, accessing internal resources and network topology.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 30 Sep 2026
- **Updated:** 2 Oct 2026
- **Also known as:** GHSA-26q6-mgpf-f836

## What is CVE-2026-103243?

CVE-2026-103243 is a medium-severity server-side request forgery vulnerability in ModelTC LightLLM, published on 30 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

LightLLM through 1.2.0 fails to validate image_url and audio_url parameters in multimodal endpoints, allowing unauthenticated attackers to perform server-side request forgery. Attackers can supply arbitrary URLs to fetch internal resources, with vision model processing disclosing content or error responses revealing internal network topology.

Weakness: CWE-918 (Server-Side Request Forgery)

## Which versions are affected by CVE-2026-103243?


## How do I fix CVE-2026-103243?

No fix has been published for CVE-2026-103243 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-103243 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-103243 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-103243 and fix it if it is affected.

What it is: CVE-2026-103243 is a medium-severity server-side request forgery vulnerability in ModelTC LightLLM, published on 30 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-103243 exists.

Affected product: ModelTC LightLLM. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-103243/ (Markdown: https://insights.sbomify.com/CVE-2026-103243/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-103243
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-103243
- OSV: https://osv.dev/vulnerability/CVE-2026-103243

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-103243/
Summaries are generated and may contain mistakes; the official description above is the record.