CVE-2026-11556

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-06-08. a secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this weekElevated
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2%CVSS: 8.8Exploit: Elevated riskExposed: 0

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

A security flaw has been discovered in Tenda F451 1.0.0.7/1.0.0.9. Impacted is the function formWriteFacMac of the file /goform/WriteFacMac of the component Web Management Interface. Performing a manipulation of the argument mac results in os command injection. Remote exploitation of the attack is possible. The exploit has been released to the public and may be used for attacks.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
56(Track*)
EG Risk 56/100SSVC: 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
Severity88% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
2%
EPSS %ILE
74%
KEV
Not listed

Published

June 8, 2026

Last Modified

July 23, 2026

Advisory Details (2)

Auto-updated Jun 8, 2026
No patch confirmed yet.
generic

腾达(Tenda) 腾达中文网站 - 致力于建设值得信赖的好网络

https://www.tenda.com.cn/
generic

IoT_vlu/reports/Tenda/formWriteFacMac2/formWriteFacMac.md at main · Robots10/IoT_vlu · GitHub

https://github.com/Robots10/IoT_vlu/blob/main/reports/Tenda/formWriteFacMac2/formWriteFacMac.md

Vendor Advisories for CVE-2026-11556(1)

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

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 17× in last 7d / 64× 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 127 total refreshes for this CVE.

  1. 2026-07-28 15:36 UTCEPSS rescore
  2. 2026-07-28 02:52 UTCEG score recompute
  3. 2026-07-28 02:52 UTCGHSA enrichment
  4. 2026-07-27 14:13 UTCEPSS rescore
  5. 2026-07-27 09:15 UTCGHSA enrichment
  6. 2026-07-26 21:40 UTCEG score recompute
  7. 2026-07-26 21:40 UTCGHSA enrichment
  8. 2026-07-26 14:54 UTCEPSS rescore
  9. 2026-07-26 14:54 UTCEPSS rescore
  10. 2026-07-26 07:08 UTCEG score recompute
  11. 2026-07-26 07:08 UTCGHSA enrichment
  12. 2026-07-25 14:17 UTCEPSS rescore
  13. 2026-07-24 14:17 UTCEPSS rescore
  14. 2026-07-23 14:18 UTCEPSS rescore
  15. 2026-07-23 07:50 UTCNVD updateCVSS v4 → 7.4
  16. 2026-07-23 03:04 UTCEG score recompute
  17. 2026-07-22 14:08 UTCEPSS rescore
  18. 2026-07-21 15:24 UTCEPSS rescore
  19. 2026-07-20 17:08 UTCEPSS rescore
  20. 2026-07-19 14:30 UTCEPSS rescore
  21. 2026-07-19 02:28 UTCEPSS rescore
  22. 2026-07-18 10:04 UTCEPSS rescore
  23. 2026-07-16 17:02 UTCEPSS rescore
  24. 2026-07-16 09:56 UTCGHSA enrichment
  25. 2026-07-15 22:21 UTCGHSA enrichment
Show 75 more
  1. 2026-07-15 16:57 UTCEPSS rescore
  2. 2026-07-15 02:00 UTCEPSS rescore
  3. 2026-07-14 14:21 UTCGHSA enrichment
  4. 2026-07-14 02:45 UTCGHSA enrichment
  5. 2026-07-13 22:30 UTCEPSS rescore
  6. 2026-07-13 06:12 UTCEPSS rescore
  7. 2026-07-12 09:56 UTCGHSA enrichment
  8. 2026-07-12 05:46 UTCEPSS rescore
  9. 2026-07-11 21:00 UTCGHSA enrichment
  10. 2026-07-11 09:25 UTCGHSA enrichment
  11. 2026-07-11 08:27 UTCEPSS rescore
  12. 2026-07-10 21:27 UTCGHSA enrichment
  13. 2026-07-09 19:10 UTCEPSS rescore
  14. 2026-07-09 04:37 UTCGHSA enrichment
  15. 2026-07-08 15:53 UTCGHSA enrichment
  16. 2026-07-08 15:15 UTCEPSS rescore
  17. 2026-07-08 15:15 UTCEPSS rescore
  18. 2026-07-08 02:44 UTCGHSA enrichment
  19. 2026-07-07 13:46 UTCEPSS rescore
  20. 2026-07-06 16:27 UTCEPSS rescore
  21. 2026-07-06 02:23 UTCEPSS rescore
  22. 2026-07-05 17:27 UTCGHSA enrichment
  23. 2026-07-05 03:29 UTCGHSA enrichment
  24. 2026-07-05 02:30 UTCEPSS rescore
  25. 2026-07-05 02:30 UTCEPSS rescore
  26. 2026-07-04 14:55 UTCGHSA enrichment
  27. 2026-07-04 06:31 UTCEPSS rescore
  28. 2026-07-03 16:12 UTCGHSA enrichment
  29. 2026-07-03 02:53 UTCGHSA enrichment
  30. 2026-07-02 14:55 UTCGHSA enrichment
  31. 2026-07-02 03:18 UTCGHSA enrichment
  32. 2026-07-01 15:42 UTCGHSA enrichment
  33. 2026-07-01 15:06 UTCEPSS rescore
  34. 2026-07-01 15:06 UTCEPSS rescore
  35. 2026-07-01 04:05 UTCGHSA enrichment
  36. 2026-06-30 23:22 UTCEPSS rescore
  37. 2026-06-30 16:26 UTCGHSA enrichment
  38. 2026-06-30 01:15 UTCGHSA enrichment
  39. 2026-06-29 13:40 UTCGHSA enrichment
  40. 2026-06-29 02:04 UTCGHSA enrichment
  41. 2026-06-28 14:27 UTCGHSA enrichment
  42. 2026-06-28 14:07 UTCEPSS rescore
  43. 2026-06-28 04:56 UTCEPSS rescore
  44. 2026-06-28 04:56 UTCEPSS rescore
  45. 2026-06-28 02:52 UTCGHSA enrichment
  46. 2026-06-27 15:17 UTCGHSA enrichment
  47. 2026-06-27 03:42 UTCGHSA enrichment
  48. 2026-06-27 03:08 UTCEPSS rescore
  49. 2026-06-26 16:07 UTCGHSA enrichment
  50. 2026-06-26 04:31 UTCGHSA enrichment
  51. 2026-06-25 16:54 UTCGHSA enrichment
  52. 2026-06-25 13:49 UTCEPSS rescore
  53. 2026-06-25 05:18 UTCGHSA enrichment
  54. 2026-06-24 16:36 UTCGHSA enrichment
  55. 2026-06-24 14:05 UTCEPSS rescore
  56. 2026-06-24 05:01 UTCGHSA enrichment
  57. 2026-06-23 21:32 UTCEPSS rescore
  58. 2026-06-23 16:00 UTCGHSA enrichment
  59. 2026-06-23 01:47 UTCGHSA enrichment
  60. 2026-06-22 14:04 UTCGHSA enrichment
  61. 2026-06-21 20:14 UTCGHSA enrichment
  62. 2026-06-21 14:56 UTCEPSS rescore
  63. 2026-06-21 14:56 UTCEPSS rescore
  64. 2026-06-21 02:25 UTCGHSA enrichment
  65. 2026-06-20 11:07 UTCGHSA enrichment
  66. 2026-06-19 23:26 UTCGHSA enrichment
  67. 2026-06-19 19:25 UTCEPSS rescore
  68. 2026-06-19 10:00 UTCGHSA enrichment
  69. 2026-06-18 21:30 UTCGHSA enrichment
  70. 2026-06-18 17:52 UTCEPSS rescore
  71. 2026-06-18 09:54 UTCGHSA enrichment
  72. 2026-06-17 22:18 UTCGHSA enrichment
  73. 2026-06-17 17:53 UTCEPSS rescore
  74. 2026-06-17 10:42 UTCGHSA enrichment
  75. 2026-06-16 23:07 UTCGHSA enrichment

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Frequently asked(5)

What is CVE-2026-11556?
CVE-2026-11556 is a high vulnerability published on June 8, 2026. A security flaw has been discovered in Tenda F451 1.0.0.7/1.0.0.9. Impacted is the function formWriteFacMac of the file /goform/WriteFacMac of the component Web Management Interface. Performing a manipulation of the argument mac results in os command injection. Remote exploitation of the attack is…
When was CVE-2026-11556 disclosed?
CVE-2026-11556 was first published in the National Vulnerability Database on June 8, 2026, with the most recent update on July 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-11556 actively exploited?
CVE-2026-11556 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2% probability of exploitation in the next 30 days, which ranks it in the top 26.5% of all scored CVEs.
What is the CVSS score of CVE-2026-11556?
CVE-2026-11556 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-11556?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-11556, 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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