CVE-2026-52842

CRITICALPre-NVD 9.39.3
EchelonGraph scoreMEDIUM confidence

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

This critical-severity CVE scores 9.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2% (14th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
9.3EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 9.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Lightpanda is a headless browser designed for AI and automation. Prior to 0.3.1, Lightpanda searched for @ across the entire URL string instead of only the authority component when computing a page origin, so a URL such as http://attacker.com/@victim.com/ was fetched from attacker.com but treated as http://victim.com, allowing a complete Same-Origin Policy bypass. This issue is fixed in version 0.3.1.

CVSS v3
9.3
EG Score
9.3CRITICALmedium confidence
EG Risk
42
EG Risk 42/100

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed (value × EchelonGraph’s weight)
Severity93% × 45%
The EG Score, 9.3 of 10.
Exploitation0.2% × 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 low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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
0.2%
EPSS %ILE
14th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

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

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (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

July 15, 2026

Last Modified

July 15, 2026

Advisory Details (4)

Auto-updated Oct 8, 2026
Patch available. Sources: github_commit, github_pr, github_release, github.
GitHub advisoryMentions a patch (unverified)

URL parser misidentifies page origin for URLs containing @ in the path - Same-Origin Policy bypass · Advisory · lightpanda-io/browser · GitHub

https://github.com/lightpanda-io/browser/security/advisories/GHSA-mq6p-m9cc-q432
GitHub release Patch Available

0.3.1

Patch available: lightpanda-io/browser 0.3.1

https://github.com/lightpanda-io/browser/releases/tag/0.3.1
GitHub pull request

Improve authority parsing

Fix merged in lightpanda-io/browser PR #1998 on 2026-03-26 — awaiting tagged release

https://github.com/lightpanda-io/browser/pull/1998
GitHub commit

commit 0588cc374d4a (lightpanda-io/browser)

Fix landed in lightpanda-io/browser commit 0588cc374d4a — awaiting tagged release

https://github.com/lightpanda-io/browser/commit/0588cc374d4af9687cf6f45a7d52f7af04bbacfb

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 13× in last 7d / 35× 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 100 of 131 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. None are among the latest 100 rows. The 31 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-14 09:17 UTCEG score recompute
  2. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  3. 2026-10-13 06:34 UTCEG score recompute
  4. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  5. 2026-10-12 15:58 UTCEG score recompute
  6. 2026-10-11 19:41 UTCEG score recompute
  7. 2026-10-11 16:56 UTCEG score recompute
  8. 2026-10-11 14:19 UTCEG score recompute
  9. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  10. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  11. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  12. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  13. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  14. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  15. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  16. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  17. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  18. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  19. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  20. 2026-10-01 12:40 UTCEG score recompute
  21. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  22. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  23. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  24. 2026-09-28 08:45 UTCEG score recompute
  25. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.2% · 14th percentile
Show 75 more
  1. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  2. 2026-09-26 00:27 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  3. 2026-09-24 08:50 UTCEG score recompute
  4. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  5. 2026-09-23 03:16 UTCEG score recompute
  6. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  7. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  8. 2026-09-18 04:45 UTCEG score recompute
  9. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  10. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  11. 2026-09-13 23:12 UTCEG score recompute
  12. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  13. 2026-09-12 17:08 UTCEG score recompute
  14. 2026-09-11 21:46 UTCEG score recompute
  15. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  16. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  17. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  18. 2026-09-08 00:51 UTCEG score recompute
  19. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  20. 2026-09-06 17:42 UTCEG score recompute
  21. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  22. 2026-09-05 20:50 UTCEG score recompute
  23. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  24. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  25. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  26. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  27. 2026-08-30 20:59 UTCEG score recompute
  28. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  29. 2026-08-30 03:51 UTCEG score recompute
  30. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  31. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  32. 2026-08-27 21:27 UTCEG score recompute
  33. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  34. 2026-08-26 23:07 UTCEG score recompute
  35. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  36. 2026-08-25 15:45 UTCEG score recompute
  37. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  38. 2026-08-24 19:33 UTCEG score recompute
  39. 2026-08-24 13:11 UTCEG score recompute
  40. 2026-08-22 00:39 UTCEG score recompute
  41. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  42. 2026-08-21 00:21 UTCEG score recompute
  43. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  44. 2026-08-20 00:16 UTCEG score recompute
  45. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  46. 2026-08-18 19:59 UTCEG score recompute
  47. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  48. 2026-08-17 15:48 UTCEG score recompute
  49. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  50. 2026-08-16 15:44 UTCEG score recompute
  51. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  52. 2026-08-16 03:43 UTCEG score recompute
  53. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  54. 2026-08-15 03:43 UTCEG score recompute
  55. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  56. 2026-08-13 23:41 UTCEG score recompute
  57. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  58. 2026-08-12 15:35 UTCEG score recompute
  59. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  60. 2026-08-11 15:13 UTCEG score recompute
  61. 2026-08-11 03:12 UTCEG score recompute
  62. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  63. 2026-08-09 15:10 UTCEG score recompute
  64. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  65. 2026-08-08 19:10 UTCEG score recompute
  66. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  67. 2026-08-07 19:08 UTCEG score recompute
  68. 2026-08-06 15:06 UTCEG score recompute
  69. 2026-08-06 13:47 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  70. 2026-08-05 23:03 UTCEG score recompute
  71. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  72. 2026-08-04 17:02 UTCEG score recompute
  73. 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  74. 2026-08-04 13:01 UTCEG score recompute
  75. 2026-08-04 10:39 UTCEPSS rescoreEPSS 0.2% · 5th percentile

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-52842?
CVE-2026-52842 is a critical-severity vulnerability; its CVE record was published on July 15, 2026. Lightpanda is a headless browser designed for AI and automation. Prior to 0.3.1, Lightpanda searched for @ across the entire URL string instead of only the authority component when computing a page origin, so a URL such as http://attacker.com/@victim.com/ was fetched from attacker.com but treated…
When was the CVE record for CVE-2026-52842 published?
The CVE record for CVE-2026-52842 was published on July 15, 2026. 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 July 15, 2026; the record at its source may have been updated since.
Is CVE-2026-52842 actively exploited?
CVE-2026-52842 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (14th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-52842?
CVE-2026-52842 has a CVSS base score of 9.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-52842?
A fix for CVE-2026-52842 is available: update to the fixed version the vendor names in its advisory.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-52842

Explore →

Is Your Infrastructure Affected by CVE-2026-52842?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs