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CVE-2026-62872

HIGH 8.8

Published 2026-08-11 · Last modified 2026-08-21

Incorrect authorization in .NET Framework allows an authorized attacker to elevate privileges over a network.

ELEVATED IMPACT

Severe if exploited (CVSS 8.8), but no known exploitation and low modeled probability. Patch on a normal cadence.

Exploitation likelihood

0.5%chance of exploitation in 30 days · 43rd percentile

○ In CISA KEV ○ Public exploit / PoC

Impact if exploited

8.8CVSS 3.1 · HIGH

  • ConfidentialityHigh
  • IntegrityHigh
  • AvailabilityHigh

What an attacker needs

  • ✓Access: Reachable over the network — no local access needed
  • ⚠Privileges: Requires a low-privilege account
  • ✓User interaction: No user interaction needed
  • ✓Complexity: No special conditions — reliably repeatable

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept & exploit code

Test against your own equipment

curl -s https://vulnpedia.com/cve/CVE-2026-62872/poc.jsonMachine-readable PoC index for this CVE (for automation).

Listed for defensive triage, patch verification, and authorized testing on systems you own. Machine-readable: /cve/CVE-2026-62872/poc.json

Affected

Vendors Microsoft

Products Microsoft .Net Framework 3.5 Microsoft .Net Framework 3.5 And 4.6.2/4.7/4.7.1/4.7.2 Microsoft .Net Framework 3.5 And 4.7.2 Microsoft .Net Framework 3.5 And 4.8 Microsoft .Net Framework 3.5 And 4.8.1 Microsoft .Net Framework 4.6.2/4.7/4.7.1/4.7.2 Microsoft .Net Framework 4.8 Microsoft .Net Framework 4.8.1 .Net Framework Windows 11 26h1 Windows 10 1607 Windows Server 2012

Weakness (CWE)

  • CWE-863: : Incorrect Authorization

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Known Affected Software Configurations

VendorProductVersion range
Microsoft.Net Framework4.8.1
Microsoft.Net Framework4.8
Microsoft.Net Framework4.6.2
Microsoft.Net Framework4.7
Microsoft.Net Framework4.7.1
Microsoft.Net Framework4.7.2
Microsoft.Net Framework3.5
Microsoft.Net Framework4.8.1
Microsoft.Net Framework3.5
Microsoft.Net Framework4.7.2
Microsoft.Net Framework3.5
Microsoft.Net Framework4.8
Microsoft.Net Framework3.5
Microsoft.Net Framework4.6.2
Microsoft.Net Framework4.7
Microsoft.Net Framework4.7.1
Microsoft.Net Framework4.7.2
Microsoft.Net Framework3.5

All CVSS metrics

  • HIGH 8.8 v3.1 · CNA Primary
    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
  • HIGH 8.8 v3.1 · NVD Secondary
    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

Patches & mitigations

Sources: NVD · CVE.org · EPSS