# CVE-2026-108790: westboy CicadasCMS Backend Template Editor save TemplateController.save path traversal

> Remote attackers with permissions can exploit a path traversal vulnerability in the backend template editor to read or modify arbitrary files.

- **Severity:** Medium 5.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 12 Oct 2026
- **Updated:** 15 Oct 2026
- **Also known as:** GHSA-r594-rf5q-r69h

## What is CVE-2026-108790?

CVE-2026-108790 is a medium-severity path traversal vulnerability in westboy CicadasCMS, published on 12 Oct 2026. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

A security flaw has been discovered in westboy CicadasCMS up to 2431154dac8d0735e04f1fd2a3c3556668fc8dab. This impacts the function TemplateController.save of the file /system/cms/template/save of the component Backend Template Editor. The manipulation results in path traversal. The attack may be performed from remote. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

Weakness: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2026-108790?


## How do I fix CVE-2026-108790?

No fix has been published for CVE-2026-108790 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-108790 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-108790 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-108790 and fix it if it is affected.

What it is: CVE-2026-108790 is a medium-severity path traversal vulnerability in westboy CicadasCMS, published on 12 Oct 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-108790 exists.

Affected product: westboy CicadasCMS. 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-2026-108790/ (Markdown: https://insights.sbomify.com/CVE-2026-108790/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-108790
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-108790
- OSV: https://osv.dev/vulnerability/CVE-2026-108790

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-108790/
Summaries are generated and may contain mistakes; the official description above is the record.