CVE-2026-55977

LOWPre-NVD 3.33.3—
EchelonGraph scoreMEDIUM confidence

Score 3.3 from GitHub Security Advisory (severity: LOW) published 2026-07-28. A secondary CVSS source baseline 3.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
3.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 3.3Exploit: None knownExposed services: Not assessed

No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.

Successful exploitation of this vulnerability could allow an attacker with local network access to bypass the application's rate-limiting mechanism, enabling brute-forcing of the screen-sharing code and potentially displaying harmful content on the affected screen.

CVSS v3
3.3
EG Score
3.3LOWmedium confidence
EG Risk
15
EG Risk 15/100CISA SSVC

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
Severity33% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.1%
EPSS %ILE
2nd
KEV
Not listed

CISA SSVCTrack at every mission impact level.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

July 28, 2026

Last Modified

July 30, 2026

References (1)

Vendor Advisories for CVE-2026-55977(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

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 100 of 108 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 8 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  2. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  3. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  4. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  5. 2026-10-07 05:36 UTCEG score recompute
  6. 2026-10-07 05:36 UTCGHSA enrichmentGHSA-c7qx-9h3v-84x3 · GitHub severity LOW · GitHub CVSS 3.3
  7. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  8. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  9. 2026-10-04 07:12 UTCEG score recompute
  10. 2026-10-04 07:12 UTCGHSA enrichmentGHSA-c7qx-9h3v-84x3 · GitHub severity LOW · GitHub CVSS 3.3
  11. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  12. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  13. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  14. 2026-10-01 03:45 UTCEG score recompute
  15. 2026-10-01 03:45 UTCGHSA enrichmentGHSA-c7qx-9h3v-84x3 · GitHub severity LOW · GitHub CVSS 3.3
  16. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  17. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  18. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  19. 2026-09-28 03:27 UTCEG score recompute
  20. 2026-09-28 03:26 UTCGHSA enrichmentGHSA-c7qx-9h3v-84x3 · GitHub severity LOW · GitHub CVSS 3.3
  21. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  22. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  23. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  24. 2026-09-23 17:54 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  25. 2026-09-22 23:00 UTCEG score recompute
Show 75 more
  1. 2026-09-22 23:00 UTCGHSA enrichmentGHSA-c7qx-9h3v-84x3 · GitHub severity LOW · GitHub CVSS 3.3
  2. 2026-09-20 20:16 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  3. 2026-09-20 00:37 UTCEG score recompute
  4. 2026-09-20 00:37 UTCGHSA enrichmentGHSA-c7qx-9h3v-84x3 · GitHub severity LOW · GitHub CVSS 3.3
  5. 2026-09-18 19:28 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  6. 2026-09-17 19:31 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  7. 2026-09-17 01:42 UTCEG score recompute
  8. 2026-09-17 01:42 UTCGHSA enrichmentGHSA-c7qx-9h3v-84x3 · GitHub severity LOW · GitHub CVSS 3.3
  9. 2026-09-16 14:08 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  10. 2026-09-16 05:15 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  11. 2026-09-15 03:11 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  12. 2026-09-14 01:40 UTCEG score recompute
  13. 2026-09-14 01:40 UTCGHSA enrichmentGHSA-c7qx-9h3v-84x3 · GitHub severity LOW · GitHub CVSS 3.3
  14. 2026-09-11 14:53 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  15. 2026-09-11 03:18 UTCEG score recompute
  16. 2026-09-11 03:18 UTCGHSA enrichmentGHSA-c7qx-9h3v-84x3 · GitHub severity LOW · GitHub CVSS 3.3
  17. 2026-09-10 09:35 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  18. 2026-09-08 22:01 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  19. 2026-09-08 04:55 UTCEG score recompute
  20. 2026-09-08 04:55 UTCGHSA enrichmentGHSA-c7qx-9h3v-84x3 · GitHub severity LOW · GitHub CVSS 3.3
  21. 2026-09-07 16:01 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  22. 2026-09-06 13:47 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  23. 2026-09-05 05:34 UTCEG score recompute
  24. 2026-09-05 05:34 UTCGHSA enrichmentGHSA-c7qx-9h3v-84x3 · GitHub severity LOW · GitHub CVSS 3.3
  25. 2026-09-01 22:54 UTCEG score recompute
  26. 2026-09-01 22:54 UTCGHSA enrichmentGHSA-c7qx-9h3v-84x3 · GitHub severity LOW · GitHub CVSS 3.3
  27. 2026-09-01 13:54 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  28. 2026-08-30 19:17 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  29. 2026-08-30 01:22 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  30. 2026-08-29 23:37 UTCEG score recompute
  31. 2026-08-29 23:37 UTCGHSA enrichmentGHSA-c7qx-9h3v-84x3 · GitHub severity LOW · GitHub CVSS 3.3
  32. 2026-08-28 21:41 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  33. 2026-08-27 14:25 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  34. 2026-08-26 14:46 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  35. 2026-08-26 02:58 UTCEG score recompute
  36. 2026-08-26 02:58 UTCGHSA enrichmentGHSA-c7qx-9h3v-84x3 · GitHub severity LOW · GitHub CVSS 3.3
  37. 2026-08-25 13:49 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  38. 2026-08-23 04:34 UTCEG score recompute
  39. 2026-08-23 04:34 UTCGHSA enrichmentGHSA-c7qx-9h3v-84x3 · GitHub severity LOW · GitHub CVSS 3.3
  40. 2026-08-23 00:19 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  41. 2026-08-21 23:49 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  42. 2026-08-20 22:55 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  43. 2026-08-20 06:12 UTCEG score recompute
  44. 2026-08-20 06:12 UTCGHSA enrichmentGHSA-c7qx-9h3v-84x3 · GitHub severity LOW · GitHub CVSS 3.3
  45. 2026-08-19 17:04 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  46. 2026-08-17 13:47 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  47. 2026-08-17 07:48 UTCEG score recompute
  48. 2026-08-17 07:48 UTCGHSA enrichmentGHSA-c7qx-9h3v-84x3 · GitHub severity LOW · GitHub CVSS 3.3
  49. 2026-08-16 02:14 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  50. 2026-08-15 01:30 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  51. 2026-08-14 09:26 UTCEG score recompute
  52. 2026-08-14 09:26 UTCGHSA enrichmentGHSA-c7qx-9h3v-84x3 · GitHub severity LOW · GitHub CVSS 3.3
  53. 2026-08-13 22:00 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  54. 2026-08-11 11:03 UTCEG score recompute
  55. 2026-08-11 11:03 UTCGHSA enrichmentGHSA-c7qx-9h3v-84x3 · GitHub severity LOW · GitHub CVSS 3.3
  56. 2026-08-11 00:00 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  57. 2026-08-09 13:46 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  58. 2026-08-08 16:37 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  59. 2026-08-08 12:41 UTCEG score recompute
  60. 2026-08-08 12:41 UTCGHSA enrichmentGHSA-c7qx-9h3v-84x3 · GitHub severity LOW · GitHub CVSS 3.3
  61. 2026-08-06 13:47 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  62. 2026-08-05 19:17 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  63. 2026-08-05 14:18 UTCEG score recompute
  64. 2026-08-05 14:18 UTCGHSA enrichmentGHSA-c7qx-9h3v-84x3 · GitHub severity LOW · GitHub CVSS 3.3
  65. 2026-08-04 15:10 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  66. 2026-08-04 10:39 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  67. 2026-08-03 10:36 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  68. 2026-08-02 15:28 UTCEG score recompute
  69. 2026-08-02 15:28 UTCGHSA enrichmentGHSA-c7qx-9h3v-84x3 · GitHub severity LOW · GitHub CVSS 3.3
  70. 2026-08-02 02:27 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  71. 2026-08-01 04:16 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  72. 2026-07-30 17:05 UTCEG score recompute
  73. 2026-07-30 17:05 UTCGHSA enrichmentGHSA-c7qx-9h3v-84x3 · GitHub severity LOW · GitHub CVSS 3.3
  74. 2026-07-30 16:28 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  75. 2026-07-30 01:30 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-55977?
CVE-2026-55977 is a low vulnerability published on July 28, 2026. Successful exploitation of this vulnerability could allow an attacker with local network access to bypass the application's rate-limiting mechanism, enabling brute-forcing of the screen-sharing code and potentially displaying harmful content on the affected screen.
When was the CVE record for CVE-2026-55977 published?
The CVE record for CVE-2026-55977 was published on July 28, 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 30, 2026; the record at its source may have been updated since.
Is CVE-2026-55977 actively exploited?
CVE-2026-55977 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (2nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-55977?
CVE-2026-55977 has a CVSS base score of 3.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-55977?
No fix for CVE-2026-55977 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-55977 are linked in the Vendor Advisories panel on this page.

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