Page generated: 09 Nov 2026, 08:46 UTC
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CVE-2026-42897

Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.

CVSS 8.1 (HIGH) KEV: KNOWN CATALOG

Attention and evidence

HYPE SCORE
0.0/10
REALITY · THREAT PRIORITY
8.6/10
General review priority; not probability

Evidence confidence: Exploitation recorded

Why this priority?
  • Recorded exploitation baseline: +7.00
  • Technical severity: CVSS 8.1: +1.21
  • Fresh EPSS: 70.66%: +0.35

General review priority, not probability, victim count or asset-specific risk. A range covers missing CVSS/EPSS inputs within the current evidence state.

Sources: 27 documents and public datasets.

Hype components

Headline sample (25%)
0/100
Press, 30 days (60%)
0/100
Grounded branding (15%)
0/100
HYPE TOTAL0/100

Sources and documents

Help Net Security
Press · 02 Sep 2026, 07:00 · Nearly 22,000 Microsoft Exchange servers remain exposed to critical security flaw (CVE-2026-62911) - Help Net Security
BleepingComputer
Press · 01 Sep 2026, 07:00 · Nearly 22,000 Microsoft Exchange servers vulnerable to hijack attacks - BleepingComputer
Recorded Future
Press · 07 Aug 2026, 07:00 · July 2026 CVE Landscape - Recorded Future
Resecurity
Press · 02 Aug 2026, 07:00 · Inside OWAReaper: How CVE-2026-42897 Enables Persistent Exchange Mailbox Compromise - Resecurity
Help Net Security
Press · 30 Jul 2026, 07:00 · Laundry Bear’s new Microsoft Exchange attack triggers on email open (CVE-2026-42897) - Help Net Security
See all 27 source documents
The Hacker News
Press · 30 Jul 2026, 07:00 · Russian Hackers Exploit Microsoft OWA Flaw to Keep Mailbox Access After Credential Rotation - The Hacker News
BleepingComputer
Press · 29 Jul 2026, 07:00 · Russian hackers exploit Exchange OWA zero-day for long-term mailbox access - BleepingComputer
Proofpoint
Press · 29 Jul 2026, 07:00 · Cleaning Out Inboxes: TA488 Comes for Outlook with Another Half-Click Exploit - Proofpoint
Redmondmag.com
Press · 11 Jun 2026, 07:00 · Microsoft Releases June 2026 Security Updates for Exchange Server - Redmondmag.com
SecurityWeek
Press · 11 Jun 2026, 07:00 · Microsoft Patches Exploited Exchange Server Vulnerability - SecurityWeek
BleepingComputer
Press · 10 Jun 2026, 07:00 · Microsoft patches Exchange Server zero-day exploited in attacks - BleepingComputer
Proofpoint
Press · 27 May 2026, 07:00 · More CVEs, Same Playbook: 2026 Vulnerability Exploitation in the Wild - Proofpoint
Rescana
Press · 19 May 2026, 07:00 · CVE-2026-42897 Zero-Day Analysis: Microsoft Exchange Server OWA XSS Vulnerability Exploited in the Wild - Rescana
The Hacker News
Press · 18 May 2026, 07:00 · ⚡ Weekly Recap: Exchange 0-Day, npm Worm, Fake AI Repo, Cisco Exploit and More - The Hacker News
Forbes
Press · 18 May 2026, 07:00 · Microsoft Confirms Active 0-Day Exploit—Check Emergency Mitigation - Forbes
Dark Reading
Press · 18 May 2026, 07:00 · Microsoft Exchange Zero-Day Under Attack, No Patch Available - Dark Reading
Notebookcheck
Press · 17 May 2026, 07:00 · Microsoft Exchange Server zero-day exploited via crafted email - Notebookcheck
BleepingComputer
Press · 15 May 2026, 07:00 · Microsoft warns of Exchange zero-day flaw exploited in attacks - BleepingComputer
The Hacker News
Press · 15 May 2026, 07:00 · On-Prem Microsoft Exchange Server CVE-2026-42897 Exploited via Crafted Email - The Hacker News
Infosecurity Magazine
Press · 15 May 2026, 07:00 · Microsoft Reports Severe Zero-Day Flaw in On-Prem Exchange Servers - Infosecurity Magazine
Help Net Security
Press · 15 May 2026, 07:00 · Unpatched Microsoft Exchange Server vulnerability exploited (CVE-2026-42897) - Help Net Security
SecurityWeek
Press · 15 May 2026, 07:00 · Microsoft Warns of Exchange Server Zero-Day Exploited in the Wild - SecurityWeek
SOC Prime
Press · 15 May 2026, 07:00 · CVE-2026-42897: Exchange Server OWA Spoofing Flaw Exploited via Crafted Email - SOC Prime
Security Affairs
Press · 15 May 2026, 07:00 · CVE-2026-42897: Microsoft confirms active exploitation of Exchange Server zero-day - Security Affairs
CSO Online
Press · 15 May 2026, 07:00 · Exchange Server zero-day vulnerability can be triggered by opening a malicious email - CSO Online
CERT-FR
Technical advisory · 15 May 2026, 00:00 · [Màj] Vulnérabilité dans Microsoft Exchange Server (15 mai 2026)
CERT-FR
Press · 15 May 2026, 00:00 · [Màj] Vulnérabilité dans Microsoft Exchange Server (15 mai 2026)

Score evolution

● Hype   ● Reality

Earlier evidence-support scores are retained in history; this chart shows only the current priority definition.

First record: hype 0.0 · reality 8.6 (2026-11-02 15:14). The curve appears once the score changes.

Public exploit evidence

0

Public exploit entries / repo candidates

Evidence context and dated references

Reality is general threat/review priority, combining observed exploitation, CVSS severity and fresh EPSS. Evidence confidence is separate. This is not calibrated risk, a victim count or an asset-specific assessment. A range reflects missing numeric inputs.

Evidence in context

Confidence in exploitation evidence
Exploitation recorded
Priority basis
Recorded exploitation; CVSS 8.1; EPSS 70.7%
Attention, last 30 days
0 distinct story titles; 0 press documents; 0 publisher domains.
Technical potential
network access, no prior privileges, user interaction.
Observed activity
Exploitation recorded in CISA KEV.
Known scale
Not quantified.
Evidence confidence basis
Trusted exploitation confirmation

Score evaluated: 2026-11-05 14:00:10.041099+00:00 · EPSS snapshot: 2026-11-05T12:03:04Z

Source event timeline
Published
14 May 2026, 17:00
Added to the CISA KEV catalog
15 May 2026, 00:00
First press mention
15 May 2026, 00:00
Latest press mention
02 Sep 2026, 07:00
Score calculated
05 Nov 2026, 14:00