What’s Vulnerable › Vulnerabilities

CVE-2026-55835: Lookyloo: Potential sub-system DoS due to parameter missmatch in notification

• Severity: medium (CVSS 6.9 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-23 · updated 2026-10-23
• Weakness: CWE-233

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.

Affected products

• lookyloo: before 1.39.4

References

• https://github.com/Lookyloo/lookyloo/commit/d5b9a401998cd50b88e5d7425f82baac78d8f082
• https://github.com/Lookyloo/lookyloo/pull/1330
• https://github.com/Lookyloo/lookyloo/releases/tag/v1.39.4
• https://github.com/Lookyloo/lookyloo/security/advisories/GHSA-66gj-hmcp-5cfj

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