# CVE-2026-34127: Stored Cross-Site Scripting (XSS) via Configuration File Import on TP-Link's TL-SG108PE

> An attacker with admin access can inject scripts via configuration import, leading to session theft or unauthorized changes in the web interface.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:A/AC:L/AT:N/PR:H/UI:P/VC:H/VI:L/VA:H/SC:L/SI:N/SA:L`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 29 May 2026
- **Updated:** 29 May 2026
- **Also known as:** GHSA-pmw4-462f-6fp3

## What is CVE-2026-34127?

CVE-2026-34127 is a medium-severity cross-site scripting vulnerability in TP-Link Systems Inc. TL-SG108PE v5, published on 29 May 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

A stored
cross-site scripting (XSS) vulnerability has been identified in the web
management interface of TP-Link's TL-SG108PE v5 switch due to improper sanitation of the SYSNAM
configuration parameter during configuration file import. An attacker with
administrator access can inject malicious script into the device configuration,
which may be stored and executed in the administrator’s browser when the
affected interface is viewed.    

Successful
exploitation may allow session cookie theft, unauthorized configuration
changes, or access to sensitive information exposed through the management
interface.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-34127?

It affects 1 product.


Products: Tp-Link Tl-Sg108pe Firmware.

## How do I fix CVE-2026-34127?

No fix has been published for CVE-2026-34127 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-34127 being exploited?

There is no known exploitation of CVE-2026-34127 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-34127 and fix it if it is affected.

What it is: CVE-2026-34127 is a medium-severity cross-site scripting vulnerability in TP-Link Systems Inc. TL-SG108PE v5, published on 29 May 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-34127 in the wild and no public exploit code.

Affected product: TP-Link Systems Inc. TL-SG108PE v5. 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-2026-34127/ (Markdown: https://insights.sbomify.com/CVE-2026-34127/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-34127
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-34127
- OSV: https://osv.dev/vulnerability/CVE-2026-34127

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-34127/
Summaries are generated and may contain mistakes; the official description above is the record.