CVE-2026-57501

UNRATEDCVSS · not yet scored
—
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
—
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
—
EG Risk
—
EPSS PROB
0.5%
EPSS %ILE
41st
KEV
Not listed

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.

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

July 10, 2026

References (3)

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 32× 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 90 of 96 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. 10 repeat rows among the latest 100 are merged into the row they repeat. The 6 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

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

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-57501

Explore →

Is Your Infrastructure Affected by CVE-2026-57501?

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

Book a Demo →Browse All CVEs