CVE-2026-19977 EFM ipTIME A3004T Session Validation httpcon_check_session_url improper authentication
Remote attackers can bypass authentication in EFM ipTIME A3004T routers due to improper session validation, potentially gaining unauthorized access.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-19977?
CVE-2026-19977 is a critical authentication bypass vulnerability in EFM ipTIME A3004T, published on 17 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability was detected in EFM ipTIME A3004T 14.19.0. The affected element is the function httpcon_check_session_url of the component Session Validation. Performing a manipulation results in improper authentication. Remote exploitation of the attack is possible. The exploit is now public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
Weakness: CWE-287
Which versions are affected by CVE-2026-19977?
How do I fix CVE-2026-19977?
No fix has been published for CVE-2026-19977 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-19977 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-19977 exists.
Sources
Also known as GHSA-6h4w-hx37-cqg3.