CVE-2026-31255

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-04-27. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: Elevated riskExposed: 0

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

A command injection vulnerability exists in Tenda AC18 V15.03.05.05_multi. The vulnerability is located in the /goform/SetSambaCfg interface, where improper handling of the guestuser parameter allows attackers to execute arbitrary system commands.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
60(Track)
EG Risk 60/100SSVC: 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
Severity98% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
64%
KEV
Not listed

Published

April 27, 2026

Last Modified

April 28, 2026

Advisory Details (1)

Auto-updated Sep 9, 2026
No patch confirmed yet.
generic

CVE_REQUESTS_references/Tenda_AC18/Tenda_AC18_3th/README.md at main · izxnfirh8148/CVE_REQUESTS_references · GitHub

https://github.com/izxnfirh8148/CVE_REQUESTS_references/blob/main/Tenda_AC18/Tenda_AC18_3th/README.md

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 5× in last 7d / 30× 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 297 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-31255?
CVE-2026-31255 is a critical vulnerability published on April 27, 2026. A command injection vulnerability exists in Tenda AC18 V15.03.05.05_multi. The vulnerability is located in the /goform/SetSambaCfg interface, where improper handling of the guestuser parameter allows attackers to execute arbitrary system commands.
When was CVE-2026-31255 disclosed?
CVE-2026-31255 was first published in the National Vulnerability Database on April 27, 2026, with the most recent update on April 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-31255 actively exploited?
CVE-2026-31255 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 35.6% of all scored CVEs.
What is the CVSS score of CVE-2026-31255?
CVE-2026-31255 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-31255?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-31255, 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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