# CVE-2026-5363: Use of weak cryptographic key in TP-Link Archer C7

> An adjacent attacker can recover the admin password by factoring the weak RSA-1024 key used in client-side encryption, leading to full device compromise.

- **Severity:** Medium 5.4 (`CVSS:4.0/AV:A/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 15 Apr 2026
- **Updated:** 16 Apr 2026
- **Also known as:** GHSA-r35r-mrc6-xgfp

## What is CVE-2026-5363?

CVE-2026-5363 is a medium-severity vulnerability in TP-Link Systems Inc. Archer C7 v5 and v5.8, published on 15 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Inadequate Encryption Strength vulnerability in TP-Link Archer C7 v5 and v5.8 (uhttpd modules) allows Password Recovery Exploitation. The web interface encrypts the admin password client-side using RSA-1024 before sending it to the router during login. 
An adjacent attacker with the ability to intercept network traffic could potentially perform a brute-force or factorization attack against the 1024-bit RSA key to recover the plaintext administrator password, leading to unauthorized access and compromise of the device configuration.  This issue affects Archer C7: through Build 20220715.

Weakness: CWE-326 (Inadequate Encryption Strength)

## Which versions are affected by CVE-2026-5363?

It affects 1 product.


Products: Tp-Link Archer C7 Firmware.

## How do I fix CVE-2026-5363?

No fix has been published for CVE-2026-5363 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-5363 being exploited?

There is no known exploitation of CVE-2026-5363 in the wild and no public exploit code.

## Other vulnerabilities in TP-Link Systems Inc. Archer C7 v5 and v5.8

- [CVE-2025-9377](https://insights.sbomify.com/CVE-2025-9377/): TP-Link Archer C7(EU) and TL-WR841N/ND(MS) OS Command Injection (high 8.6, exploited in the wild)
- [CVE-2023-39224](https://insights.sbomify.com/CVE-2023-39224/): Command injection in Archer C5 (high 8.0)
- [CVE-2023-2646](https://insights.sbomify.com/CVE-2023-2646/): TP-Link Archer C7v2 GET Request Parameter denial of service (medium 4.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-5363 and fix it if it is affected.

What it is: CVE-2026-5363 is a medium-severity vulnerability in TP-Link Systems Inc. Archer C7 v5 and v5.8, published on 15 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-5363 in the wild and no public exploit code.

Affected product: TP-Link Systems Inc. Archer C7 v5 and v5.8. 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-2026-5363/ (Markdown: https://insights.sbomify.com/CVE-2026-5363/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-5363
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-5363
- OSV: https://osv.dev/vulnerability/CVE-2026-5363

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-5363/
Summaries are generated and may contain mistakes; the official description above is the record.