Reference page — cumulative record through Wednesday, October 7, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
Office Online Server
Product reference — Office Online Server by Microsoft · sector: Operating Systems & Platforms. Cumulative disclosure record for this product across the archive.
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Product totals
| All-time | YTD | |
|---|---|---|
| CVEs | 86 | 83 |
| KEV entries | 0 | 0 |
| KEV/100 | Med CVSS | Med EPSS | C | H | M | L |
|---|---|---|---|---|---|---|
| 0.0 | 7.8 | .0047 | 0 | 68 | 17 | 1 |
KEV/100 = KEV entries ÷ CVEs × 100. Med CVSS / Med EPSS are medians over this product's disclosures. C/H/M/L = disclosures by CVSS severity band.
Monthly disclosures
Trend (by first-seen month, full archive): ▂▁▁▁▁▁▁▁▁▂▂▁▂▂▂█▆▂▁
| Month | New CVEs |
|---|---|
| 2025-11 | 0 |
| 2025-12 | 0 |
| 2026-01 | 3 |
| 2026-02 | 3 |
| 2026-03 | 0 |
| 2026-04 | 5 |
| 2026-05 | 3 |
| 2026-06 | 7 |
| 2026-07 | 33 |
| 2026-08 | 25 |
| 2026-09 | 4 |
| 2026-10 | 0 |
Notable CVEs
Ranked by the published formula: KEV → EPSS → CVSS → CVE ID.
| CVE | CVSS | EPSS %ile | Severity | KEV | First seen |
|---|---|---|---|---|---|
| CVE-2025-27751 | 7.8 | 84.1 | HIGH | — | 2025-04-08 |
| CVE-2026-55054 | 6.5 | 59.0 | MEDIUM | — | 2026-07-14 |
| CVE-2026-70327 | 6.5 | 59.0 | MEDIUM | — | 2026-08-11 |
| CVE-2026-70328 | 6.5 | 59.1 | MEDIUM | — | 2026-08-11 |
| CVE-2025-27746 | 7.8 | 57.3 | HIGH | — | 2025-04-08 |
| CVE-2026-65807 | 8.8 | 55.8 | HIGH | — | 2026-08-11 |
| CVE-2025-26642 | 7.8 | 55.1 | HIGH | — | 2025-04-08 |
| CVE-2026-45455 | 4.3 | 53.8 | MEDIUM | — | 2026-06-09 |
| CVE-2026-21258 | 5.5 | 48.6 | MEDIUM | — | 2026-02-10 |
| CVE-2026-21261 | 5.5 | 48.6 | MEDIUM | — | 2026-02-10 |
| CVE-2026-20955 | 7.8 | 47.3 | HIGH | — | 2026-01-13 |
| CVE-2026-44822 | 8.2 | 47.1 | HIGH | — | 2026-06-09 |
| CVE-2026-21259 | 7.8 | 44.5 | HIGH | — | 2026-02-10 |
| CVE-2026-48580 | 5.5 | 43.6 | MEDIUM | — | 2026-07-14 |
| CVE-2026-50408 | 5.5 | 43.6 | MEDIUM | — | 2026-07-14 |
Recent CVEs
| CVE | CVSS | EPSS %ile | Severity | KEV | First seen |
|---|---|---|---|---|---|
| CVE-2026-81956 | 7.8 | 38.3 | HIGH | — | 2026-09-08 |
| CVE-2026-81947 | 7.8 | 38.3 | HIGH | — | 2026-09-08 |
| CVE-2026-81401 | 5.5 | 43.6 | MEDIUM | — | 2026-09-08 |
| CVE-2026-81390 | 5.5 | 43.6 | MEDIUM | — | 2026-09-08 |
| CVE-2026-70328 | 6.5 | 59.1 | MEDIUM | — | 2026-08-11 |
| CVE-2026-70327 | 6.5 | 59.0 | MEDIUM | — | 2026-08-11 |
| CVE-2026-68817 | 7.8 | 38.3 | HIGH | — | 2026-08-11 |
| CVE-2026-68816 | 7.8 | 38.3 | HIGH | — | 2026-08-11 |
| CVE-2026-68815 | 7.8 | 38.3 | HIGH | — | 2026-08-11 |
| CVE-2026-68814 | 7.8 | 38.3 | HIGH | — | 2026-08-11 |
| CVE-2026-68812 | 7.8 | 38.3 | HIGH | — | 2026-08-11 |
| CVE-2026-68811 | 7.8 | 38.3 | HIGH | — | 2026-08-11 |
| CVE-2026-68810 | 7.8 | 38.3 | HIGH | — | 2026-08-11 |
| CVE-2026-68808 | 5.5 | 43.6 | MEDIUM | — | 2026-08-11 |
| CVE-2026-68807 | 7.8 | 38.3 | HIGH | — | 2026-08-11 |
KEV entries
No entries in the CISA KEV catalog.
Related
Vendor: Microsoft — all products and the full vendor record.
Methodology
A product is a (vendor, product) pair as named in the affected-product data. Rate statistics are arithmetic over published figures. Counts key to first-seen day. Raw counts are not comparable across products; this is a reference page assembled from the public record, not a ranking by our judgment.
Sources. CVE Program (cvelistV5), NVD (NIST), CISA KEV, FIRST EPSS.
