CVE-2025-66459

MEDIUMNVD 6.16.1
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

This medium-severity CVE scores 6.1 under NVD CVSS v3. EPSS exploit probability: 0.3% (26th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3

Also known asEUVD-2025-200304 (ENISA EUVD)Source: ENISA EUVD

6.1EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 6.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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 1.35.3, a XSS vulnerability can be triggered when a user submits a list of URLs to capture, one of them contains a HTML element, and the capture fails. Then, the error field is populated with an error message that contains the bad URL they tried to capture, triggering the XSS. This vulnerability is fixed in 1.35.3.

CVSS v3
6.1
EG Score
6.1MEDIUMmedium confidence
EG Risk
28
EG Risk 28/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity61% × 45%
Impact severity (EG Severity): CVSS 6.1 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.3% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.3%
EPSS %ILE
26th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (6.1): severity, escalated by confirmed exploitation. This CVE's 6.1 is its impact severity (EG Severity), not escalated.

EG Severity
6.1 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
EG Likelihood
0.3% within 30 daysSource: FIRST EPSS. FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

December 2, 2025

Last Modified

September 25, 2026

Advisory Details (4)

Auto-updated Sep 25, 2026
Patch available. Sources: github, github_commit.
GitHub advisoryMentions a patch (unverified)

XSS due to unescaped error message passed to innerHTML · Advisory · Lookyloo/lookyloo · GitHub

https://github.com/Lookyloo/lookyloo/security/advisories/GHSA-hvmh-j2jx-48wg
GitHub commit Patch Available

commit 95cdc00fe37f (Lookyloo/lookyloo)

Patch available: Lookyloo/lookyloo v1.35.3 (contains commit 95cdc00fe37f)

https://github.com/Lookyloo/lookyloo/commit/95cdc00fe37fd89790fa89bb3ee3fefa2da38442
GitHub commit Patch Available

commit 8c3ab96de44c (Lookyloo/lookyloo)

Patch available: Lookyloo/lookyloo v1.35.3 (contains commit 8c3ab96de44c)

https://github.com/Lookyloo/lookyloo/commit/8c3ab96de44c1ce15646d734aa06faf884329116
GitHub commit Patch Available

commit 1850a34b8cec (Lookyloo/lookyloo)

Patch available: Lookyloo/lookyloo v1.35.3 (contains commit 1850a34b8cec)

https://github.com/Lookyloo/lookyloo/commit/1850a34b8cec52438df3b544295b20cfa35f8ad1

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 8× in last 7d / 39× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 95 of 199 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 5 repeat rows among the latest 100 are merged into the row they repeat. The 104 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-02 16:43 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  2. 2026-11-01 16:33 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  3. 2026-10-31 17:25 UTCOSV refresh
  4. 2026-10-31 16:31 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  5. 2026-10-30 16:33 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  6. 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  7. 2026-10-28 16:30 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  8. 2026-10-27 16:30 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  9. 2026-10-26 16:30 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  10. 2026-10-25 16:31 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  11. 2026-10-25 16:08 UTCEG score recompute
  12. 2026-10-24 16:31 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  13. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  14. 2026-10-23 12:33 UTCEG score recompute
  15. 2026-10-22 16:33 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  16. 2026-10-21 16:31 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  17. 2026-10-20 16:31 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  18. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  19. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  20. 2026-10-18 10:55 UTCOSV refresh
  21. 2026-10-18 05:19 UTCEG score recompute
  22. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  23. 2026-10-16 16:39 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  24. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  25. 2026-10-14 16:31 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
Show 70 more
  1. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  2. 2026-10-12 16:48 UTCEG score recompute
  3. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  4. 2026-10-11 20:23 UTCEG score recompute
  5. 2026-10-11 18:35 UTCEG score recompute
  6. 2026-10-11 15:09 UTCEG score recompute
  7. 2026-10-11 13:47 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  8. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  9. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  10. 2026-10-08 17:10 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  11. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  12. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  13. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  14. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  15. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  16. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  17. 2026-09-30 15:02 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  18. 2026-09-29 15:20 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  19. 2026-09-28 13:50 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  20. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  21. 2026-09-25 23:33 UTCEG score recompute
  22. 2026-09-24 14:02 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  23. 2026-09-23 13:47 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  24. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  25. 2026-09-19 15:42 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  26. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  27. 2026-09-17 19:30 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  28. 2026-09-16 14:07 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  29. 2026-09-15 03:10 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  30. 2026-09-13 16:46 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  31. 2026-09-12 15:00 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  32. 2026-09-12 08:10 UTCOSV refresh
  33. 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  34. 2026-09-11 09:36 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  35. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  36. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  37. 2026-09-07 16:00 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  38. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  39. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  40. 2026-09-02 14:11 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  41. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  42. 2026-08-30 19:16 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  43. 2026-08-30 01:21 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  44. 2026-08-28 21:40 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  45. 2026-08-27 14:24 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  46. 2026-08-26 14:45 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  47. 2026-08-25 13:48 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  48. 2026-08-24 14:16 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  49. 2026-08-24 13:03 UTCOSV refresh
  50. 2026-08-23 00:18 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  51. 2026-08-21 23:48 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  52. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  53. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  54. 2026-08-18 13:47 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  55. 2026-08-17 13:46 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  56. 2026-08-16 14:55 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  57. 2026-08-16 02:13 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  58. 2026-08-15 01:29 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  59. 2026-08-13 21:59 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  60. 2026-08-12 13:50 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  61. 2026-08-11 13:42 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  62. 2026-08-10 23:59 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  63. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  64. 2026-08-08 16:36 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  65. 2026-08-08 08:46 UTCEG score recompute
  66. 2026-08-07 16:26 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  67. 2026-08-06 13:46 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  68. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  69. 2026-08-04 15:09 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  70. 2026-08-04 10:37 UTCEPSS rescoreEPSS 0.3% · 22nd percentile

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Frequently asked(5)

What is CVE-2025-66459?
CVE-2025-66459 is a medium-severity vulnerability; its CVE record was published on December 2, 2025. 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 1.35.3, a XSS vulnerability can be triggered when a user submits a list of URLs to capture, one of them contains a HTML element, and the capture fails. Then, the…
When was the CVE record for CVE-2025-66459 published?
The CVE record for CVE-2025-66459 was published on December 2, 2025. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 25, 2026; the record at its source may have been updated since.
Is CVE-2025-66459 actively exploited?
CVE-2025-66459 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (26th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2025-66459?
CVE-2025-66459 has a CVSS v3 base score of 6.1 (NVD).
How do I remediate CVE-2025-66459?
A fix for CVE-2025-66459 is available: update to the fixed version the vendor names in its advisory.

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