CVE-2026-21514

CRITICALNVD 7.89.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2026-02-10), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 7.8 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 5 sources updated this weekExploited in the wild
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 2%CVSS: 7.8Exploit: cisa kev · ssvc active · public exploitExposed: 0

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

Reliance on untrusted inputs in a security decision in Microsoft Office Word allows an unauthorized attacker to bypass a security feature locally.

CVSS v3
7.8
EG Score
9.0(high)
EG Risk
81(Attend)
EG Risk 81/100SSVC: Attend

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
Severity90% × 45%
Exploitation100% × 40%
Automatability0% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
2%
EPSS %ILE
74%
KEV
⚠ Exploited

Published

February 10, 2026

Last Modified

August 19, 2026

Advisory Details (2)

Auto-updated Jun 3, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: microsoft, cisa.
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21514
microsoft Patch Available

Security Update Guide - Microsoft Security Response Center

Security Update Guide - Microsoft Security Response Center. Patch available via Microsoft Security Update

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21514

Weakness Classification(1)

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

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 95× in last 7d / 399× 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 1,423 total refreshes for this CVE.

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

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCChaitanyaHaritash/CVE-2026-21514_CVE-2026-21510
    First seen May 4, 2026

    CVE-2026-21514 & CVE-2026-21510 (Because MS-Office Fascinates me)

    Open source ↗

Frequently asked(6)

What is CVE-2026-21514?
CVE-2026-21514 is a critical vulnerability published on February 10, 2026. Reliance on untrusted inputs in a security decision in Microsoft Office Word allows an unauthorized attacker to bypass a security feature locally.
When was CVE-2026-21514 disclosed?
CVE-2026-21514 was first published in the National Vulnerability Database on February 10, 2026, with the most recent update on August 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-21514 actively exploited?
Yes. CISA added CVE-2026-21514 to the Known Exploited Vulnerabilities catalog on February 10, 2026, affecting Microsoft Office. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2026-21514?
CVE-2026-21514 has a CVSS v3 base score of 7.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2026-21514?
CVE-2026-21514 affects Microsoft Office. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2026-21514?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-21514, 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.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-21514

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