CVE-2026-27479 Wallos: SSRF via Redirect Bypass in Logo/Icon URL Fetch
Attackers can bypass IP validation via HTTP redirects to access internal resources and cloud metadata in Wallos.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-27479?
CVE-2026-27479 is a high-severity server-side request forgery vulnerability in ellite Wallos, published on 21 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Wallos is an open-source, self-hostable personal subscription tracker. Versions 4.6.0 and below contain a Server-Side Request Forgery (SSRF) vulnerability in the subscription and payment logo/icon upload functionality. The application validates the IP address of the provided URL before making the request, but allows HTTP redirects (CURLOPT_FOLLOWLOCATION = true), enabling an attacker to bypass the IP validation and access internal resources, including cloud instance metadata endpoints. The getLogoFromUrl() function validates the URL by resolving the hostname and checking if the resulting IP is in a private or reserved range using FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE. However, the subsequent cURL request is configured with CURLOPT_FOLLOWLOCATION = true and CURLOPT_MAXREDIRS = 3, which means the request will follow HTTP redirects without re-validating the destination IP. This issue has been fixed in version 4.6.1.
Weakness: CWE-918
Which versions are affected by CVE-2026-27479?
It affects 1 product.
Products include Wallosapp Wallos.
How do I fix CVE-2026-27479?
No fix has been published for CVE-2026-27479 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-27479 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-27479 exists.
Other vulnerabilities in ellite Wallos
Sources
Also known as GHSA-fgmf-7g5v-jmjg.