CVE-2026-35089

HIGHNVD 8.78.7—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.7 under NVD CVSS v3. EPSS exploit probability: 0.6%, top 54% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Trending — 3 sources updated this week
8.7EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.7Exploit: None knownExposed: 0

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

In Slican telephone exchanges secure key is generated in a predictable manner using properties of the telephone exchange which can be obtained without authentication. An unauthenticated attacker can deduce the secure key and obtain admin credentials.

This issue was fixed in versions below:

  • IPx series: version 6.61.0040
  • CCT-1668: version 6.56.0430
  • MAC-6400: version 6.56.0430
  • CXS-0424: version 6.30.0510

The issue STILL EXISTS in End-Of-Life telephone exchanges in versions 4.xx and below:

  • CCT-1668 (CCT1CPU)
  • MAC-6400
  • CXS-0424
These products were discontinued in 2011 and 2012 and and will not receive updates. These products require a hardware update in order to receive a software update. The vendor recommends that users of these devices contact the their service department directly to determine the options for upgrading.

CVSS v3
8.7
EG Score
8.7(medium)
EG Risk
54(Track)
EG Risk 54/100SSVC: Track

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
Severity87% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
46%
KEV
Not listed

Published

May 27, 2026

Last Modified

May 27, 2026

Advisory Details (1)

Auto-updated Jun 3, 2026
No patch confirmed yet.
generic

Podatności w oprogramowaniu central telefonicznych Slican | CERT Polska

https://cert.pl/posts/2026/05/CVE-2026-35087

Vendor Advisories for CVE-2026-35089(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 9× in last 7d / 38× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.

Showing the most recent 100 of 248 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-35089?
CVE-2026-35089 is a high vulnerability published on May 27, 2026. In Slican telephone exchanges secure key is generated in a predictable manner using properties of the telephone exchange which can be obtained without authentication. An unauthenticated attacker can deduce the secure key and obtain admin credentials. This issue was fixed in versions below: IPx…
When was CVE-2026-35089 disclosed?
CVE-2026-35089 was first published in the National Vulnerability Database on May 27, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-35089 actively exploited?
CVE-2026-35089 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 53.6% of all scored CVEs.
What is the CVSS score of CVE-2026-35089?
CVE-2026-35089 has a CVSS v3 base score of 8.7 (NVD).
How do I remediate CVE-2026-35089?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-35089, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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