# CVE-2026-1740: EFM ipTIME A8004T Hidden Hiddenloginsetup timepro.cgi httpcon_check_session_url improper authentication

> Remote attackers can bypass authentication on EFM ipTIME A8004T routers via the timepro.cgi interface, potentially gaining unauthorized access.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 2 Feb 2026
- **Updated:** 23 Feb 2026
- **Also known as:** GHSA-33w6-9gm9-5rj4

## What is CVE-2026-1740?

CVE-2026-1740 is a medium-severity authentication bypass vulnerability in EFM ipTIME A8004T, published on 2 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability was found in EFM ipTIME A8004T 14.18.2. This impacts the function httpcon_check_session_url of the file /cgi/timepro.cgi of the component Hidden Hiddenloginsetup Interface. The manipulation results in improper authentication. The attack may be performed from remote. The exploit has been made public and could be used. The vendor was contacted early about this disclosure but did not respond in any way.

Weakness: CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2026-1740?

It affects 1 product.


Products: Iptime A8004t Firmware.

## How do I fix CVE-2026-1740?

No fix has been published for CVE-2026-1740 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-1740 being exploited?

There is no known exploitation of CVE-2026-1740 in the wild and no public exploit code.

## Other vulnerabilities in EFM ipTIME A8004T

- [CVE-2026-1741](https://insights.sbomify.com/CVE-2026-1741/): EFM ipTIME A8004T Debug d.cgi httpcon_check_session_url backdoor (high 7.5)
- [CVE-2026-1742](https://insights.sbomify.com/CVE-2026-1742/): EFM ipTIME A8004T VPN Service timepro.cgi commit_vpncli_file_upload unrestricted upload (medium 5.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-1740 and fix it if it is affected.

What it is: CVE-2026-1740 is a medium-severity authentication bypass vulnerability in EFM ipTIME A8004T, published on 2 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-1740 in the wild and no public exploit code.

Affected product: EFM ipTIME A8004T. 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-2026-1740/ (Markdown: https://insights.sbomify.com/CVE-2026-1740/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-1740
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-1740
- OSV: https://osv.dev/vulnerability/CVE-2026-1740

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-1740/
Summaries are generated and may contain mistakes; the official description above is the record.