CVE-2026-55835 Lookyloo: Potential sub-system DoS due to parameter missmatch in notification
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-55835?
CVE-2026-55835 is a medium-severity vulnerability in lookyloo, published on 23 Oct 2026.
Official description
Lookyloo is a web interface that allows users to capture a website page and then display a tree of domains that call each other. Prior to version 1.39.4, an unauthenticated user can trigger Lookyloo's "report a capture" email on demand (this is expected). The /json/<uuid>/report API endpoint (CaptureReport) is incorrectly passing the email and comment parameters, overwriting as_admin. When True, as_admin will trigger a search query on a MISP instance (if configured) and add a list of matching URLs in the email sent to the analyst (not the submitter, so there is no risk of leaking information) . It could potentially cause a DoS on the MISP instance. This issue has been patched in version 1.39.4.
Weakness: CWE-233
Which versions are affected by CVE-2026-55835?
How do I fix CVE-2026-55835?
No fix has been published for CVE-2026-55835 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-55835 being exploited?
There is no known exploitation of CVE-2026-55835 in the wild and no public exploit code.
Sources
Also known as GHSA-66gj-hmcp-5cfj.