CVE-2026-57501

UNRATEDCVSS · not yet scored

Also known asEUVD-2026-42748 (ENISA EUVD)Source: ENISA EUVD

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EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • No CVSS published and no exploitation signals yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS v2: —Exploit: None knownExposed services: Not assessed

The CVE record names the fixed release — apply it.

Zen is a firefox-based browser. Prior to 1.21.5b, Zen's glance and split-view context-menu actions, Open link in glance and Split link in new tab, load a page-controlled link URL with the System principal instead of the originating page's principal, allowing a malicious web page to place a link to a file URL that can load with System privileges when opened through either context-menu item and bypass the content-to-file security check that blocks an ordinary click. This issue is fixed in version 1.21.5b.

CVSS v3
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EchelonGraph score
Not yet assessedNo source has published severity data for this CVE yet — no CVSS score from NVD or a CNA, no GitHub advisory, and it is not in CISA KEV. This is not a rating of zero; we cannot assess it yet.
EG Score
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EG Risk
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EPSS PROB
0.5%
EPSS %ILE
43rd
KEV
Not listed

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

EG Severity
Not assessed: no CVSS publishedA missing CVSS is not a severity of zero.
EG Likelihood
0.5% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-24). 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
No SSVC decision: EchelonGraph has not assessed this CVECISA 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 BOD 26-04 block below.

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

July 9, 2026

Last Modified

October 25, 2026

References (3)

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 37× 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 97 of 125 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. 3 repeat rows among the latest 100 are merged into the row they repeat. The 28 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-02 16:45 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  2. 2026-11-01 16:35 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  3. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  4. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  5. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  6. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  7. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  8. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  9. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  10. 2026-10-25 14:17 UTCEG score recompute
  11. 2026-10-25 05:55 UTCOSV refresh
  12. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  13. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  14. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  15. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  16. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  17. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  18. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  19. 2026-10-18 03:28 UTCEG score recompute
  20. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  21. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  22. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  23. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  24. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  25. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.5% · 41st percentile
Show 72 more
  1. 2026-10-12 15:54 UTCEG score recompute
  2. 2026-10-11 19:37 UTCEG score recompute
  3. 2026-10-11 16:52 UTCEG score recompute
  4. 2026-10-11 14:15 UTCEG score recompute
  5. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  6. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  7. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  8. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  9. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  10. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  11. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  12. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  13. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  14. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  15. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  16. 2026-10-01 16:00 UTCEG score recompute
  17. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  18. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  19. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  20. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  21. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  22. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  23. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  24. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  25. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  26. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  27. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  28. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  29. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  30. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  31. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  32. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  33. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  34. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  35. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  36. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  37. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  38. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  39. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  40. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  41. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  42. 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  43. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  44. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  45. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  46. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  47. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  48. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  49. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  50. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  51. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  52. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  53. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  54. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  55. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  56. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  57. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  58. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  59. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  60. 2026-08-06 13:47 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  61. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  62. 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  63. 2026-08-04 10:39 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  64. 2026-08-01 04:16 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  65. 2026-07-31 22:17 UTCEG score recompute
  66. 2026-07-30 16:28 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  67. 2026-07-30 01:30 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  68. 2026-07-28 15:37 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  69. 2026-07-27 14:14 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  70. 2026-07-26 14:54 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  71. 2026-07-26 12:14 UTCEG score recompute
  72. 2026-07-25 14:18 UTCEPSS rescoreEPSS 0.3% · 21st percentile

Related CVEs(same CWE)

Frequently asked(4)

What is CVE-2026-57501?
CVE-2026-57501 is a vulnerability whose severity is not yet rated; its CVE record was published on July 9, 2026. Zen is a firefox-based browser. Prior to 1.21.5b, Zen's glance and split-view context-menu actions, Open link in glance and Split link in new tab, load a page-controlled link URL with the System principal instead of the originating page's principal, allowing a malicious web page to place a link to…
When was the CVE record for CVE-2026-57501 published?
The CVE record for CVE-2026-57501 was published on July 9, 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 October 25, 2026; the record at its source may have been updated since.
Is CVE-2026-57501 actively exploited?
CVE-2026-57501 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (43rd percentile of EPSS-scored CVEs).
How do I remediate CVE-2026-57501?
The CVE record for CVE-2026-57501 names the fix: "This issue is fixed in version 1.21.5b."

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