CVE-2026-26129

HIGHPre-NVD 7.57.5
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-05-08. The CNA's CVSS baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: the CNA's CVSS, EPSS, GitHub Security Advisory
7.5EG
EchelonGraph verdictPlan mitigationRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.0%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is referenced (a reference tagged "Patch", often a source commit), but no release containing it is confirmed — find the release that contains it; until it is applied, mitigate (WAF / firewall / segmentation).

Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an unauthorized attacker to disclose information over a network.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
49
EG Risk 49/100

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)
Severity75% × 45%
The EG Score, 7.5 of 10.
Exploitation1.0% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (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: A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it and apply that within your standard update timelines at low or medium mission impact and sooner than that at high; until then, restrict network exposure of the affected system or apply the vendor's mitigation.
EPSS PROB
1.0%
EPSS %ILE
62nd
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it and apply that within your standard update timelines at low or medium mission impact and sooner than that at high; until then, restrict network exposure of the affected system or apply the vendor's mitigation.

Exploitation none (CISA Vulnrichment) · Automatable yes (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)14 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (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

May 7, 2026

Last Modified

August 10, 2026

Advisory Details (1)

Auto-updated May 7, 2026
Fix referenced — no release confirmed yet. Sources: microsoft.
MicrosoftMentions a patch (unverified)

Security Update Guide - Microsoft Security Response Center

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26129

Vendor Advisories for CVE-2026-26129(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 / 24× 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 98 of 294 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. 2 repeat rows among the latest 100 are merged into the row they repeat. The 196 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-12 16:33 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
  2. 2026-10-12 16:18 UTCEG score recompute
  3. 2026-10-11 20:00 UTCEG score recompute
  4. 2026-10-11 17:14 UTCEG score recompute
  5. 2026-10-11 14:45 UTCEG score recompute
  6. 2026-10-11 13:48 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
  7. 2026-10-10 20:00 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
  8. 2026-10-09 20:07 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
  9. 2026-10-08 17:11 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
  10. 2026-10-07 23:47 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
  11. 2026-10-06 15:17 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
  12. 2026-10-05 17:42 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
  13. 2026-10-04 23:21 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
  14. 2026-10-03 14:25 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
  15. 2026-10-01 19:49 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
  16. 2026-09-30 15:03 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
  17. 2026-09-28 13:51 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
  18. 2026-09-26 15:58 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
  19. 2026-09-26 00:26 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
  20. 2026-09-20 20:15 UTCEPSS rescoreEPSS 1.1% · 65th percentile
  21. 2026-09-18 19:27 UTCEPSS rescoreEPSS 1.1% · 65th percentile
  22. 2026-09-16 14:07 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  23. 2026-09-16 05:15 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  24. 2026-09-13 16:47 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  25. 2026-09-12 15:01 UTCEPSS rescoreEPSS 1.1% · 64th percentile
Show 73 more
  1. 2026-09-11 14:52 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  2. 2026-09-10 09:34 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  3. 2026-09-08 22:00 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  4. 2026-09-07 16:01 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  5. 2026-09-06 13:47 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  6. 2026-09-04 05:06 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  7. 2026-09-02 14:11 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  8. 2026-09-01 13:53 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  9. 2026-09-01 04:39 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  10. 2026-08-30 19:17 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  11. 2026-08-30 01:22 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  12. 2026-08-28 21:41 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  13. 2026-08-27 14:25 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  14. 2026-08-26 14:46 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  15. 2026-08-25 13:48 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  16. 2026-08-23 19:33 UTCEG score recompute
  17. 2026-08-23 19:33 UTCVendor advisory
  18. 2026-08-23 19:33 UTCGHSA enrichmentGHSA-hpvr-rjcg-4q53 · GitHub severity HIGH · GitHub CVSS 7.5
  19. 2026-08-21 23:49 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  20. 2026-08-20 22:55 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  21. 2026-08-19 17:03 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  22. 2026-08-18 13:48 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  23. 2026-08-17 13:47 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  24. 2026-08-17 12:42 UTCEG score recompute
  25. 2026-08-17 12:42 UTCVendor advisory
  26. 2026-08-17 12:42 UTCGHSA enrichmentGHSA-hpvr-rjcg-4q53 · GitHub severity HIGH · GitHub CVSS 7.5
  27. 2026-08-16 14:56 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  28. 2026-08-16 04:42 UTCEG score recompute
  29. 2026-08-16 04:42 UTCVendor advisory
  30. 2026-08-16 04:42 UTCGHSA enrichmentGHSA-hpvr-rjcg-4q53 · GitHub severity HIGH · GitHub CVSS 7.5
  31. 2026-08-16 02:14 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  32. 2026-08-15 01:30 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  33. 2026-08-14 15:59 UTCVendor advisory
  34. 2026-08-14 15:59 UTCGHSA enrichmentGHSA-hpvr-rjcg-4q53 · GitHub severity HIGH · GitHub CVSS 7.5
  35. 2026-08-14 03:17 UTCEG score recompute
  36. 2026-08-14 03:17 UTCVendor advisory
  37. 2026-08-14 03:17 UTCGHSA enrichmentGHSA-hpvr-rjcg-4q53 · GitHub severity HIGH · GitHub CVSS 7.5
  38. 2026-08-13 22:00 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  39. 2026-08-13 06:01 UTCVendor advisory
  40. 2026-08-13 06:01 UTCGHSA enrichmentGHSA-hpvr-rjcg-4q53 · GitHub severity HIGH · GitHub CVSS 7.5
  41. 2026-08-12 16:52 UTCEG score recompute
  42. 2026-08-12 16:52 UTCVendor advisory
  43. 2026-08-12 16:52 UTCGHSA enrichmentGHSA-hpvr-rjcg-4q53 · GitHub severity HIGH · GitHub CVSS 7.5
  44. 2026-08-12 13:50 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  45. 2026-08-11 16:55 UTCEG score recompute
  46. 2026-08-11 16:55 UTCVendor advisory
  47. 2026-08-11 16:55 UTCGHSA enrichmentGHSA-hpvr-rjcg-4q53 · GitHub severity HIGH · GitHub CVSS 7.5
  48. 2026-08-11 13:42 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  49. 2026-08-11 04:13 UTCEG score recompute
  50. 2026-08-11 04:13 UTCVendor advisory
  51. 2026-08-11 04:13 UTCGHSA enrichmentGHSA-hpvr-rjcg-4q53 · GitHub severity HIGH · GitHub CVSS 7.5
  52. 2026-08-11 00:00 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  53. 2026-08-10 15:31 UTCGHSA enrichmentGHSA-hpvr-rjcg-4q53 · GitHub severity HIGH · GitHub CVSS 7.5
  54. 2026-08-10 03:51 UTCGHSA enrichmentGHSA-hpvr-rjcg-4q53 · GitHub severity HIGH · GitHub CVSS 7.5
  55. 2026-08-09 15:10 UTCEG score recompute
  56. 2026-08-09 15:10 UTCVendor advisory
  57. 2026-08-09 15:10 UTCGHSA enrichmentGHSA-hpvr-rjcg-4q53 · GitHub severity HIGH · GitHub CVSS 7.5
  58. 2026-08-09 13:46 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  59. 2026-08-09 02:28 UTCEG score recompute
  60. 2026-08-09 02:28 UTCVendor advisory
  61. 2026-08-09 02:28 UTCGHSA enrichmentGHSA-hpvr-rjcg-4q53 · GitHub severity HIGH · GitHub CVSS 7.5
  62. 2026-08-08 16:37 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  63. 2026-08-08 03:11 UTCEG score recompute
  64. 2026-08-08 03:11 UTCVendor advisory
  65. 2026-08-08 03:11 UTCGHSA enrichmentGHSA-hpvr-rjcg-4q53 · GitHub severity HIGH · GitHub CVSS 7.5
  66. 2026-08-07 14:29 UTCGHSA enrichmentGHSA-hpvr-rjcg-4q53 · GitHub severity HIGH · GitHub CVSS 7.5
  67. 2026-08-07 01:47 UTCEG score recompute
  68. 2026-08-07 01:47 UTCVendor advisory
  69. 2026-08-07 01:47 UTCGHSA enrichmentGHSA-hpvr-rjcg-4q53 · GitHub severity HIGH · GitHub CVSS 7.5
  70. 2026-08-06 13:46 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  71. 2026-08-06 10:59 UTCVendor advisory
  72. 2026-08-06 10:59 UTCGHSA enrichmentGHSA-hpvr-rjcg-4q53 · GitHub severity HIGH · GitHub CVSS 7.5
  73. 2026-08-05 22:13 UTCEG score recompute

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Frequently asked(5)

What is CVE-2026-26129?
CVE-2026-26129 is a high-severity vulnerability; its CVE record was published on May 7, 2026. Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an unauthorized attacker to disclose information over a network.
When was CVE-2026-26129 made public?
CVE-2026-26129 was made public on May 7, 2026: that is the date its CVE record's CNA, Microsoft Corporation, gives for when the vulnerability was made public. The CVE record itself was published on May 7, 2026. EchelonGraph's copy of the record carries a last-modified date of August 10, 2026; the record at its source may have been updated since.
Is CVE-2026-26129 actively exploited?
CVE-2026-26129 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.0% probability of exploitation in the next 30 days (62nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-26129?
CVE-2026-26129 has a CVSS base score of 7.5 (the CNA's own assessment, by microsoft; NVD's own analysis pending).
How do I remediate CVE-2026-26129?
A fix for CVE-2026-26129 is referenced (a reference tagged "Patch", often a source commit), but EchelonGraph has no release containing it on record. Check that reference and the vendor's advisory for a release that contains the fix and update to it; until then, restrict network exposure of the affected system or apply the vendor's mitigation. The vendor advisories EchelonGraph has for CVE-2026-26129 are linked in the Vendor Advisories panel on this page.

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