CVE-2026-21531

criticalpriority · track · 11EPSS 0.026 · 85 %ileexploit · PoCDEEUNLRUUS
grimoire priorityP1 · Urgent
Exploitable?
Public exploit
1 exploit · PoC
Likely / severe?
2.58% (85th) EPSS
CVSS 9.8 · critical
Is it mine?
24 products
Check your exposure
Who says so?
7 sources
cnnvd · enisa_euvd · fstec_bdu · osv

EPSS · scored 2026-10-27

Deserialization of untrusted data in Azure SDK allows an unauthorized attacker to execute code over a network.

01

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

02

cvss

Technical severity, 0–10. One row per scoring source.

9.8
010

base score 0–10 · higher = more severe · hover a vector to decode

v3.19.8criticalAV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU
v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:Csecondary · ENISA EU
v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · secure@microsoft.com USexploitability 3.9 · impact 5.9
v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · OSV
v3.19.3criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Psecondary · CVSS-BT (t0sche)
v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:Csecondary · NCSC-NL NL
v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:Csecondary · Microsoft Security Response Center US
03

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: yes · Technical Impact: totalcoordinatorcisa_ssvcUS
04

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-502USCWE-502USCWE-502USCWE-502USCWE-502US
05

exploits (1)

Public proof-of-concept and weaponised exploit code.

06

affected products (24)

Products and version ranges known to be affected.

showing 20 of 24
07

advisories (5)

Vendor and ecosystem advisories describing this.

  • NCSC-2026-0057Kwetsbaarheden verholpen in Microsoft AzureNL2026-02-10csaf · ncsc_nlNL

    Microsoft heeft kwetsbaarheden verholpen in diverse Azure componenten.

  • WID-SEC-W-2026-0370Microsoft Azure-Produkte: Mehrere SchwachstellenDeutsch2026-02-10csaf · cert_bundDE

    Ein Angreifer kann mehrere Schwachstellen in Microsoft Azure und Microsoft Azure DevOps Server ausnutzen, um sich erweiterte Berechtigungen zu verschaffen, beliebigen Code auszuführen – sogar mit Administratorrechten –, Spoofing-Angriffe durchzuführen und vertrauliche Informationen offenzulegen.

  • msrc_CVE-2026-21531Azure SDK for Python Remote Code Execution Vulnerability2026-02-10csaf · msrc_csafUS

    To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle

  • GHSA-436v-jg82-p533Azure AI Language Authoring Elevation of Privilege Vulnerability can Lead to RCE2026-02-10ghsa · osvUS

    Deserialization of untrusted data in the Azure AI Language Conversations Authoring client library for Python allows an unauthorized attacker to execute code over a network.

  • PYSEC-2026-289Azure AI Language Authoring Elevation of Privilege Vulnerability can Lead to RCE2026-06-29vendor · osvUS

    Deserialization of untrusted data in the Azure AI Language Conversations Authoring client library for Python allows an unauthorized attacker to execute code over a network.

08

also known as (7)

Other names and identifiers for this entity.

09

sources

Which sources assert this record, and when.

cnnvdenisa_euvdfstec_bduosvcert_bundmsrc_csafncsc_nlNVDCVE.orgMITRE
published 2026-02-10modified 2026-06-17
10

references (4)

External citations — patches, advisories, analysis.

scry

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