VulnSocial

CVE-2026-55009Patch(microsoft / exchange_server)

LOWCVSS 7.8 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Patch microsoft exchange_server systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

Deserialization of untrusted data in Microsoft Exchange Server allows an authorized attacker to elevate privileges locally.

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0.5/ 10 priority

Sources & remediation

Vendor / third-party advisories
Weakness type (CWE)
CWE-502

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

NONE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • exchange_server
  • exchange_server_subscription_edition

Threat summary

  • Patch or workaround signal is available
  • 1 mentions across 1 observed day

What's happening

  • Patch or workaround mentioned in 1 signal
  • Technical details provided in 1 signal
  • 1 total mentions across 1 day

Affected systems

Vendors
microsoft
Products
exchange_serverexchange_server_subscription_edition

2 versions affected across 2 products

Deep dive

Activity timeline1 mentions / 1d
00111Mentions · 2026-07-14: 1Patch / Workaround · 2026-07-14: 1Technical Details · 2026-07-14: 107-14
Signal classification1 categories
Patch
1100.0%
Referenced assets1 URL
Full discourse1 post
  • Windows Forum@windowsforum
    Patch

    🪟 Exchange admins, July 14 isn’t a calendar reminder—it’s patch day. CVE-2026-55009 lets authenticated attackers climb the privilege ladder, and perimeter defenses won’t stop an insider with a ticket. https://windowsforum.com/threads/cve-2026-55009-patch-exchange-privilege-escalation-by-july-14.438233/?utm_source=x&utm_medium=social&utm_campaign=news_node84 #SecurityUpdates #MicrosoftExchange #ExchangeServer2… https://t.co/m5QSiz8yQf

    Post summary

    The post alerts Microsoft Exchange admins to a privilege‑escalation CVE (CVE-2026-55009) and urges patching on July 14.

    0000064
    1.2K followersView on X
CPE platform detail4 entries

4 of 4 entries

PartVendorProductVersionTarget SWTarget HW
Appmicrosoftexchange_server2016--
Appmicrosoftexchange_server2019--
Appmicrosoftexchange_server2019--
Appmicrosoftexchange_server_subscription_edition---

Explore more

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