# CVE-2026-103535: CVE-2026-103535

> Authenticated attackers can chain path traversal and code injection in the translation editor to achieve remote code execution on Thelia installations.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 12 Oct 2026
- **Updated:** 15 Oct 2026
- **Also known as:** GHSA-qv6x-p59r-f4h3

## What is CVE-2026-103535?

CVE-2026-103535 is a high-severity path traversal vulnerability in Thelia, published on 12 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Thelia v2.6.1 contains path traversal and PHP code injection vulnerabilities in its translation editor that can be chained to achieve remote code execution. The `item_name` parameter, used to build the translation file's write path, does not sanitize directory traversal sequences such as `../`. This enables an authenticated user with `UPDATE`-level permissions on `admin.configuration.language` to write files outside the expected `templates/` directory, including to web‑accessible paths. Separately, the translation‑writing logic does not escape `\` in user‑supplied values, allowing inputs to break out of the PHP string literal and inject executable code into the translation file. Chained together, these flaws allow a malicious PHP file to be written to a web-accessible path and executed with the web‑server’s privileges.

Weakness: CWE-94 (Improper Control of Generation of Code), CWE-434 (Unrestricted Upload of File with Dangerous Type)

## Which versions are affected by CVE-2026-103535?


## How do I fix CVE-2026-103535?

No fix has been published for CVE-2026-103535 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-103535 being exploited?

There is no known exploitation of CVE-2026-103535 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-103535 and fix it if it is affected.

What it is: CVE-2026-103535 is a high-severity path traversal vulnerability in Thelia, published on 12 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-103535 in the wild and no public exploit code.

Affected product: Thelia. 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-2026-103535/ (Markdown: https://insights.sbomify.com/CVE-2026-103535/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-103535
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-103535
- OSV: https://osv.dev/vulnerability/CVE-2026-103535

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-103535/
Summaries are generated and may contain mistakes; the official description above is the record.