CVE-2026-31981

MEDIUMNVD 4.85.9
EchelonGraph scoreMEDIUM confidence

“▲” beside the score: it is higher than NVD's CVSS score.

Score 5.9 from GitHub Security Advisory published 2026-07-09. NVD baseline CVSS 4.8; sources differ by 1.1.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
5.9EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 4.8Exploit: None knownExposed services: Not assessed

Upgrade to v26.2.0 or later (from the CVE record's solution, Nozomi Networks Inc.) — apply it.

A Stored HTML Injection vulnerability was discovered in the Diagram tab and Graph view due to a shared input validation function being insufficiently restrictive. An authenticated user with administrative privileges can inject malicious HTML tags into N2OS configuration data through multiple input vectors. When a victim views the affected data in the Diagram tab and Graph view, the injected HTML renders in their browser, enabling phishing and possibly open redirect attacks. Full XSS exploitation and direct information disclosure are prevented by the existing input validation and Content Security Policy configuration.

CVSS v3
4.8
EG Score
5.9MEDIUMmedium confidence
EG Risk
27
EG Risk 27/100

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 (value × EchelonGraph’s weight)
Severity59% × 45%
The EG Score, 5.9 of 10.
Exploitation0.2% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: Upgrade to v26.2.0 or later (from the CVE record's solution, Nozomi Networks Inc.). Apply it within your standard update timelines.
EPSS PROB
0.3%
EPSS %ILE
15th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

Upgrade to v26.2.0 or later (from the CVE record's solution, Nozomi Networks Inc.). Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

July 9, 2026

Last Modified

August 11, 2026

Advisory Details (1)

Auto-updated Jul 9, 2026
Fix named in the CVE record's solution (Nozomi Networks Inc.).
Web page

NN-2026:8-01 - HTML injection in Diagram tab and Graph view in Guardian/CMC before 26.2.0 - CVE-2026-31981 | Product Security Incident Response Portal

https://security.nozominetworks.com/NN-2026:8-01

Vendor Advisories for CVE-2026-31981(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 11× in last 7d / 35× 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 95 of 185 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. 5 repeat rows among the latest 100 are merged into the row they repeat. The 90 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  3. 2026-10-12 16:14 UTCEG score recompute
  4. 2026-10-11 19:57 UTCEG score recompute
  5. 2026-10-11 17:10 UTCEG score recompute
  6. 2026-10-11 14:38 UTCEG score recompute
  7. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  10. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  11. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  12. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  13. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  14. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  15. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  16. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  17. 2026-10-01 16:05 UTCEG score recompute
  18. 2026-10-01 16:05 UTCGHSA enrichmentGHSA-5g4m-c643-h8fj · GitHub CVSS 5.9
  19. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  20. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.3% · 14th percentile
  21. 2026-09-28 11:07 UTCEG score recompute
  22. 2026-09-28 11:07 UTCGHSA enrichmentGHSA-5g4m-c643-h8fj · GitHub CVSS 5.9
  23. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.3% · 14th percentile
  24. 2026-09-26 00:26 UTCEPSS rescoreEPSS 0.3% · 14th percentile
  25. 2026-09-24 11:42 UTCEG score recompute
Show 70 more
  1. 2026-09-24 11:42 UTCGHSA enrichmentGHSA-5g4m-c643-h8fj · GitHub CVSS 5.9
  2. 2026-09-23 06:01 UTCEG score recompute
  3. 2026-09-23 06:01 UTCGHSA enrichmentGHSA-5g4m-c643-h8fj · GitHub CVSS 5.9
  4. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  5. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  6. 2026-09-18 05:38 UTCEG score recompute
  7. 2026-09-18 05:38 UTCGHSA enrichmentGHSA-5g4m-c643-h8fj · GitHub CVSS 5.9
  8. 2026-09-17 19:30 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  9. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  10. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  11. 2026-09-14 08:52 UTCEG score recompute
  12. 2026-09-14 08:52 UTCGHSA enrichmentGHSA-5g4m-c643-h8fj · GitHub CVSS 5.9
  13. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  14. 2026-09-13 08:21 UTCEG score recompute
  15. 2026-09-13 08:21 UTCGHSA enrichmentGHSA-5g4m-c643-h8fj · GitHub CVSS 5.9
  16. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  17. 2026-09-12 03:27 UTCEG score recompute
  18. 2026-09-12 03:27 UTCGHSA enrichmentGHSA-5g4m-c643-h8fj · GitHub CVSS 5.9
  19. 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  20. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  21. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  22. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  23. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  24. 2026-09-05 22:37 UTCEG score recompute
  25. 2026-09-05 22:37 UTCGHSA enrichmentGHSA-5g4m-c643-h8fj · GitHub CVSS 5.9
  26. 2026-09-02 14:11 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  27. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  28. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  29. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  30. 2026-08-30 06:57 UTCEG score recompute
  31. 2026-08-30 06:57 UTCGHSA enrichmentGHSA-5g4m-c643-h8fj · GitHub CVSS 5.9
  32. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  33. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  34. 2026-08-27 21:47 UTCEG score recompute
  35. 2026-08-27 21:47 UTCGHSA enrichmentGHSA-5g4m-c643-h8fj · GitHub CVSS 5.9
  36. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  37. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  38. 2026-08-26 08:20 UTCEG score recompute
  39. 2026-08-26 08:20 UTCGHSA enrichmentGHSA-5g4m-c643-h8fj · GitHub CVSS 5.9
  40. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  41. 2026-08-25 05:15 UTCEG score recompute
  42. 2026-08-25 05:14 UTCGHSA enrichmentGHSA-5g4m-c643-h8fj · GitHub CVSS 5.9
  43. 2026-08-24 14:17 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  44. 2026-08-24 04:43 UTCGHSA enrichmentGHSA-5g4m-c643-h8fj · GitHub CVSS 5.9
  45. 2026-08-23 04:12 UTCEG score recompute
  46. 2026-08-23 04:12 UTCGHSA enrichmentGHSA-5g4m-c643-h8fj · GitHub CVSS 5.9
  47. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  48. 2026-08-22 03:40 UTCEG score recompute
  49. 2026-08-22 03:40 UTCGHSA enrichmentGHSA-5g4m-c643-h8fj · GitHub CVSS 5.9
  50. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  51. 2026-08-21 02:23 UTCEG score recompute
  52. 2026-08-21 02:23 UTCGHSA enrichmentGHSA-5g4m-c643-h8fj · GitHub CVSS 5.9
  53. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  54. 2026-08-20 01:52 UTCEG score recompute
  55. 2026-08-20 01:52 UTCGHSA enrichmentGHSA-5g4m-c643-h8fj · GitHub CVSS 5.9
  56. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  57. 2026-08-18 20:44 UTCEG score recompute
  58. 2026-08-18 20:44 UTCGHSA enrichmentGHSA-5g4m-c643-h8fj · GitHub CVSS 5.9
  59. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  60. 2026-08-17 16:47 UTCEG score recompute
  61. 2026-08-17 16:47 UTCGHSA enrichmentGHSA-5g4m-c643-h8fj · GitHub CVSS 5.9
  62. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  63. 2026-08-16 16:08 UTCEG score recompute
  64. 2026-08-16 16:08 UTCGHSA enrichmentGHSA-5g4m-c643-h8fj · GitHub CVSS 5.9
  65. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  66. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  67. 2026-08-15 15:37 UTCEG score recompute
  68. 2026-08-15 15:37 UTCGHSA enrichmentGHSA-5g4m-c643-h8fj · GitHub CVSS 5.9
  69. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  70. 2026-08-14 15:05 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-31981?
CVE-2026-31981 is a medium-severity vulnerability; its CVE record was published on July 9, 2026. A Stored HTML Injection vulnerability was discovered in the Diagram tab and Graph view due to a shared input validation function being insufficiently restrictive. An authenticated user with administrative privileges can inject malicious HTML tags into N2OS configuration data through multiple input…
When was CVE-2026-31981 made public?
CVE-2026-31981 was made public on July 7, 2026: that is the date its CVE record's CNA, Nozomi Networks Inc., gives for when the vulnerability was made public. The CVE record itself was published on July 9, 2026. EchelonGraph's copy of the record carries a last-modified date of August 11, 2026; the record at its source may have been updated since.
Is CVE-2026-31981 actively exploited?
CVE-2026-31981 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (15th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-31981?
CVE-2026-31981 has a CVSS v3 base score of 4.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 5.9 (MEDIUM).
How do I remediate CVE-2026-31981?
The CVE record's solution for CVE-2026-31981, written by its CNA Nozomi Networks Inc., names the fix: "Upgrade to v26.2.0 or later." The vendor advisories EchelonGraph has for CVE-2026-31981 are linked in the Vendor Advisories panel on this page.

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