Read the docs
TI-2026-79541 Aliases CVE-2026-55835

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

Priority LOW 37CWE-233Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
None · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00394 33rd percentileScored 2026-11-07
Fix Fixed lookyloo (Lookyloo): 1.39.4

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Lookyloolookyloobefore 1.39.41.39.4Patch availableCNA
  • lookyloo VendorLookyloo Affected before 1.39.4 Fixed in 1.39.4 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:lookyloo:lookyloo:*:*:*:*:*:*:*:*——Lookyloo
  • cpe:2.3:a:lookyloo:lookyloo:*:*:*:*:*:*:*:* Versions — — ·Lookyloo

Remediation

  • Fix · CNA lookyloo (Lookyloo) Fixed in 1.39.4

Timeline

  1. 2026-10-23 Threatist record created from CVE-2026-55835
  2. 2026-10-23 Priority changed: MEDIUM → LOW
  3. 2026-10-23 CISA SSVC decision points changed

References

Other 4

  • TI-2025-40248 Lookyloo is vulnerable due to improper user input sanitization CVSS 4.0CRITICAL 9.4
  • TI-2026-47455 Stored Cross-Site Scripting via Unsafe Capture Tree JSON Embedding CVSS 4.0CRITICAL 9.2
  • TI-2026-58562 Server-Side Request Forgery via Favicon Redirect to Local Network Resources in PlaywrightCapture CVSS 4.0MEDIUM 6.9
  • TI-2026-32379 LookyLoo - PlaywrightCapture permits access to local files and internal network resources during page capture CVSS 4.0MEDIUM 6.6
  • TI-2026-45082 Cross-Capture Session Data Leakage Due to Shared Mutable State in Looklyloo - PlaywrightCapture CVSS 4.0HIGH 7.1
  • TI-2026-47482 Zip Bomb in Lookyloo Capture Upload Allows Denial of Service CVSS 4.0MEDIUM 6.9
See all 10 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences