Patch tracker / KB5002882
KB5002882: Microsoft SharePoint Server 2019 Security Update (August 2026)
KB5002882 is a Critical security update for Microsoft SharePoint Server 2019, released 2026-08-11. It closes 39 CVEs with a maximum CVSS of 9.8. At least one of them is actively exploited (CISA KEV), so this is a deploy-first update. The most likely of them to be attacked is CVE-2026-70306, which FIRST.org rates at 77% probability of exploitation in the next 30 days.
Update summary
Fixes 39 CVEs. At least one is actively exploited (CISA KEV). Most severe CVSS 9.8 (Critical). EPSS exploit probability up to 77%. Among the top 10% of tracked Microsoft updates by EPSS exploit probability.
Microsoft documents 1 known issue with this update.
- After you run PSConfig, run the following PowerShell commands. This setting disables a defense-in-depth feature that is currently under development...
KB5002882 patches 38 CVEs across SharePoint Server 2016, 2019, and Subscription Edition, topped by a Critical flaw rated CVSS 9.8 with a 57 percent EPSS score. One of these CVEs is already in the CISA KEV catalog, meaning attackers are exploiting it in the wild even though no ransomware link has been confirmed. On-premises SharePoint farms are internet-facing in many organizations, which makes the confirmed exploitation particularly urgent here.
Do this: Apply KB5002882 to all on-premises SharePoint Server 2016, 2019, and Subscription Edition farms now, prioritizing internet-facing servers because of the confirmed CISA KEV exploitation.
AI-generated from public data, 2026-07-25. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for KB5002882
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for KB5002882
- Released
- 2026-07-14
- Last changed
- 2026-08-11
- Changes tracked
- 6
Senserva began recording day-to-day change history on 2026-07-07, and refreshes it several times a day. Release dates are historical where Microsoft publishes them; revision history is tracked from that date forward, so it does not include changes made before then.
The strongest signal is the CVE count for KB5002882 rising from 38 to 39 on 2026-08-11, a single recorded increase. This upward movement means the patch now addresses one additional vulnerability, so treat it as current and prioritize deploying the latest revision today.
- 2026-08-11 CVEs fixed 38 to 39
Recorded by Senserva on the dates shown, from the MSRC release feed. This is what moved and when, which neither the vendor advisory nor NVD publishes.
Check if KB5002882 is installed
Elevated PowerShell. No output means it is not installed.
Known issues, from Microsoft
Quoted from Microsoft's support article for KB5002882 (checked 2026-08-11). Verify against the article before acting.
After you run PSConfig, run the following PowerShell commands. This setting disables a defense-in-depth feature that is currently under development that may cause a regression. Existing actor token validation checks remain in place.
$farm = Get-SPFarm
$farm. DisableActorTokenAudienceValidation = $true #disables only the defense-in-depth validation
$farm.update ()
Customers in multi-front-end SharePoint farms with Trusted Provider or Forms authentication may face repeated authentication prompts or multiple sign-ins. This should not impact customers who have configured farms with Windows authentication. As a mitigation, configuring sticky sessions on the reverse proxy will address the majority of scenarios. Microsoft is working on a fix in the subsequent product update. While disabling SessionCookieTransformProtectionEnabled may appear to work around the issue, Microsoft does not recommend it. This setting safeguards authentication and turning it off can expose the farm to security vulnerabilities.
When a workflow status link is selected, WrkStat.aspx displays the following error message:
The WorkflowInstanceID parameter is invalid.
To workaround this issue, see Workflow status links fail after installing the July 2026 CU.
CVEs fixed by this update
Sorted exploited-first, then by CVSS. Every CVE links to its Senserva page with the full risk facts, references, and a ready-to-paste AI prompt.
| CVE | Severity | CVSS | EPSS | Exploited |
|---|---|---|---|---|
| CVE-2026-50522 | Critical | 9.8 | 77% | KEV |
| CVE-2026-56164 | Medium | 5.3 | 77% | KEV |
| CVE-2026-70306 | Critical | 9.3 | 77% | No |
| CVE-2026-55040 | Critical | 9.1 | 77% | No |
| CVE-2026-55052 | High | 8.8 | 77% | No |
| CVE-2026-55045 | High | 8.4 | 77% | No |
| CVE-2026-55032 | High | 7.8 | 77% | No |
| CVE-2026-55033 | High | 7.8 | 77% | No |
| CVE-2026-55038 | High | 7.8 | 77% | No |
| CVE-2026-55055 | High | 7.8 | 77% | No |
| CVE-2026-55125 | High | 7.8 | 77% | No |
| CVE-2026-55127 | High | 7.8 | 77% | No |
| CVE-2026-55128 | High | 7.8 | 77% | No |
| CVE-2026-55130 | High | 7.8 | 77% | No |
| CVE-2026-55132 | High | 7.8 | 77% | No |
| CVE-2026-55134 | High | 7.8 | 77% | No |
| CVE-2026-55021 | High | 7.3 | 77% | No |
| CVE-2026-55034 | High | 7.3 | 77% | No |
| CVE-2026-55126 | High | 7.3 | 77% | No |
| CVE-2026-54108 | Medium | 6.5 | 77% | No |
| CVE-2026-55051 | Medium | 6.5 | 77% | No |
| CVE-2026-55026 | Medium | 6.2 | 77% | No |
| CVE-2026-55023 | Medium | 5.5 | 77% | No |
| CVE-2026-55027 | Medium | 5.5 | 77% | No |
| CVE-2026-55028 | Medium | 5.5 | 77% | No |
| CVE-2026-55035 | Medium | 5.5 | 77% | No |
| CVE-2026-55047 | Medium | 5.5 | 77% | No |
| CVE-2026-55050 | Medium | 5.5 | 77% | No |
| CVE-2026-55121 | Medium | 5.5 | 77% | No |
| CVE-2026-55124 | Medium | 5.5 | 77% | No |
| CVE-2026-55142 | Medium | 5.5 | 77% | No |
| CVE-2026-56192 | Medium | 5.5 | 77% | No |
| CVE-2026-56157 | Medium | 5.4 | 77% | No |
| CVE-2026-55016 | Medium | 4.6 | 77% | No |
| CVE-2026-55019 | Medium | 4.6 | 77% | No |
| CVE-2026-55020 | Medium | 4.6 | 77% | No |
| CVE-2026-55030 | Medium | 4.6 | 77% | No |
| CVE-2026-55135 | Medium | 4.6 | 77% | No |
| CVE-2026-62826 | Medium | 4.6 | 77% | No |
What the press says about this update
Trusted-source coverage of the CVEs this update fixes, pulled live from their own feeds.
Scope and sources
- Affected products
- Also released in August 2026
KB5002883
40 CVEs · Critical · exploitedKB5002891
40 CVEs · Critical · exploitedKB5120228
212 CVEs · Critical · exploitedKB5120229
194 CVEs · Critical · exploitedKB5120233
214 CVEs · Critical · exploitedKB5120238
182 CVEs · Critical · exploitedKB5120240
170 CVEs · Critical · exploitedKB5120242
194 CVEs · Critical · exploitedThe full month, summarized: Microsoft Patch Tuesday.
- Authoritative references
See this and every Microsoft update ranked by real-world risk on the Microsoft Patch Tracker.