CVE-2026-42901Disclosure(microsoft / entra_id)

MEDIUMCVSS 10.0 · CRITICAL

Exploitation ongoing with high activity in latest observed window (2 mentions)

Immediate actions

Patch microsoft entra_id systems immediately
Assume compromise if assets are exposed

Recommended action window: Immediate (within 24h)

NVD description

Origin validation error in Microsoft Entra ID allows an unauthorized attacker to elevate privileges over a network.

microsoft CVEs Back to dashboard

4.0/ 10 priority

Sources & remediation

Vendor / third-party advisories

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42901

Weakness type (CWE)

CWE-346

Priority

MEDIUM

Exploitation

ACTIVE

PoC

NONE

Patch

AVAILABLE

Momentum

STABLE

Are you affected?

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

entra_id

Threat summary

Active exploitation appears in 1 classified signals
Patch or workaround signal is available
6 mentions across 2 observed days
Momentum state: stable

What's happening

Active exploitation reported across 1 signal
Patch or workaround mentioned in 2 signals
Technical details provided in 3 signals
Disclosure: 3 classified signals
General: 1 classified signal
Peaked 1d ago at 4 mentions (2026-05-23); latest day: 2
6 total mentions across 2 days

Affected systems

Vendors

microsoft

Products

entra_id

1 version affected across 1 product

Deep dive

Activity timeline6 mentions / 2d

Signal classification4 categories

Disclosure

350.0%

Active Exploitation

116.7%

General

116.7%

Patch

116.7%

Referenced assets4 URLs

By indicator

Classification over time

Date	Total	Labels

2026-05-23	4	Active Exploitation1Disclosure3
2026-05-27	2	General1Patch1

Full discourse6 posts

DailyCVE@dailycve135d
General
🔴 #Microsoft Entra ID, Privilege Escalation, #CVE-2026-42901 (Critical) https://dailycve.com/microsoft-entra-id-privilege-escalation-cve-2026-42901-critical/
Post summary
The tweet simply points to an article about a critical privilege‑escalation CVE in Microsoft Entra ID without providing further technical, exploit, or patch details.
0000052
207 followersView on X
DFIR Lab@DFIR_Lab136d
Patch
🚨 CRITICAL: CVE-2026-42901 - CVSS 10.0 Origin validation flaw in Microsoft Entra ID enables unauthenticated privilege escalation over network. No user interaction required. Patch immediately. #CVE #Vulnerability #PatchNow #ThreatIntel https://t.co/xmvMUUreYI
Post summary
The tweet highlights a critical CVE-2026-42901 with an unauthenticated privilege escalation flaw and urges immediate patching, but no PoC or active exploitation details are provided.
0000056
30 followersView on X
VulDB 🛡@vuldb139d
Active Exploitation
Some increased actor activities are shown targeting Microsoft Entra (CVE-2026-42901) https://vuldb.com/vuln/365294/cti
Post summary
Security analysts report increased actor activity targeting Microsoft Entra CVE-2026-42901, indicating potential active exploitation, though no PoC, exploit code, patch, or detailed technical data is supplied.
0000068
2.2K followersView on X
CVE@CVEnew139d
Disclosure
CVE-2026-42901 Origin validation error in Microsoft Entra ID allows an unauthorized attacker to elevate privileges over a network. https://www.cve.org/CVERecord?id=CVE-2026-42901
Post summary
The post announces a new privilege‑escalation CVE (CVE‑2026‑42901) in Microsoft Entra ID, describing the error type but providing no exploitation code, patches, or evidence of active attacks.
00000189
57.5K followersView on X
𝔸𝕟𝕠𝕟𝕪𝕞𝕠𝕦𝕤 ℍ𝕒𝕔𝕜𝕥𝕚𝕧𝕚𝕤𝕥☭⃠🅇@YourAnon_irc139d
Disclosure
Critical vulns: Microsoft Exchange zero-day (CVE-2026-42897) allows mailbox compromise. AI-gen 2FA bypass & new Azure/Entra ID (CVE-2026-42901) flaws threaten data privacy/integrity. Patch DNS! #Cybersecurity #ZeroDay #News
Post summary
The note alerts on two newly disclosed Microsoft Exchange vulnerabilities, describing their potential impact on mailbox security and data integrity, and urges a DNS patch.
00000159
14 followersView on X
VulDB 🛡@vuldb139d
Disclosure
The severity is increased for this new vulnerability affecting Microsoft Entra (CVE-2026-42901) https://vuldb.com/vuln/365294
Post summary
The text announces an increased severity for CVE-2026-42901 affecting Microsoft Entra and links to a database page, without providing technical details, PoC, exploit code, or evidence of active exploitation.
0000074
2.2K followersView on X

CPE platform detail1 entries

Part:

Vendor:

Product:

Version:

Target SW:

Target HW:

1 of 1 entries

Part	Vendor	Product	Version	Target SW	Target HW
App	microsoft	entra_id	-	-	-

Explore more

Back to dashboard microsoft CVEs entra_id vulnerabilities

What researchers are saying

CVE-2026-42901

DFIR Lab[verified]@DFIR_LabPatch

The tweet highlights a critical CVE-2026-42901 with an unauthenticated privilege escalation flaw and urges immediate patching, but no PoC or active exploitation details are provided.

DailyCVE@dailycveGeneral

The tweet simply points to an article about a critical privilege‑escalation CVE in Microsoft Entra ID without providing further technical, exploit, or patch details.

VulDB 🛡@vuldbActive Exploitation

Security analysts report increased actor activity targeting Microsoft Entra CVE-2026-42901, indicating potential active exploitation, though no PoC, exploit code, patch, or detailed technical data is supplied.

CVE@CVEnewDisclosure

The post announces a new privilege‑escalation CVE (CVE‑2026‑42901) in Microsoft Entra ID, describing the error type but providing no exploitation code, patches, or evidence of active attacks.

𝔸𝕟𝕠𝕟𝕪𝕞𝕠𝕦𝕤 ℍ𝕒𝕔𝕜𝕥𝕚𝕧𝕚𝕤𝕥☭⃠🅇@YourAnon_ircDisclosure

The note alerts on two newly disclosed Microsoft Exchange vulnerabilities, describing their potential impact on mailbox security and data integrity, and urges a DNS patch.

VulDB 🛡@vuldbDisclosure

The text announces an increased severity for CVE-2026-42901 affecting Microsoft Entra and links to a database page, without providing technical details, PoC, exploit code, or evidence of active exploitation.