CVE-2026-35090

CRITICALNVD 9.39.3—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.3 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
9.3
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.3Exploit: NoneExposed: 0

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

In Slican telephone exchanges it is possible to manage the control panel remotely. An unauthenticated attacker can connect to the modem via a telephone with a specific caller ID. This allows them to bypass admin authentication and gain full access to the service protocol and configuration panel. This vulnerability is independent of the telephone exchanges configuration. If remote access is disabled, calling with this caller ID will temporarily enable it.

This issue was fixed in versions below:

  • IPL-256: version 6.61.0040
  • IPM-032: 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
9.3
EG Score
9.3(medium)
EG Risk
42(Track)
EG Risk 42/100SSVC: 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
Severity93% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
46.3%
KEV
Not listed

Published

May 27, 2026

Last Modified

May 27, 2026

Advisory Details (1)

Auto-updated May 28, 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-2026-35090(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 / 68× 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 211 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-35090?
CVE-2026-35090 is a critical vulnerability published on May 27, 2026. In Slican telephone exchanges it is possible to manage the control panel remotely. An unauthenticated attacker can connect to the modem via a telephone with a specific caller ID. This allows them to bypass admin authentication and gain full access to the service protocol and configuration panel.…
When was CVE-2026-35090 disclosed?
CVE-2026-35090 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-2026-35090 actively exploited?
CVE-2026-35090 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 46.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-35090?
CVE-2026-35090 has a CVSS v3 base score of 9.3 (NVD).
How do I remediate CVE-2026-35090?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-35090, 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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