Lookyloo up to 1.39.3 Report API email/comment denial of service

Summaryinfo

A vulnerability classified as problematic has been found in Lookyloo up to 1.39.3. This vulnerability affects unknown code of the component Report API. Performing a manipulation of the argument email/comment results in denial of service. This vulnerability is identified as CVE-2026-55835. The attack can be initiated remotely. There is not any exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Lookyloo up to 1.39.3. It has been classified as problematic. This affects some unknown processing of the component Report API. The manipulation of the argument email/comment with an unknown input leads to a denial of service vulnerability. CWE is classifying the issue as CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. This is going to have an impact on availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-55835 since 06/17/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

Upgrading to version 1.39.4 eliminates this vulnerability.

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Productinfo

Name

• Lookyloo

Version

• 1.39.0
• 1.39.1
• 1.39.2
• 1.39.3

Website

• Product: https://github.com/Lookyloo/lookyloo/

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