CVE-2026-83711: Authorization bypass through user-controlled key in Microsoft Azure Active Directory B2C allows an unauthorize

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CRITICAL 10.0REMOTEWATCHLISTMITIGATE

CVE-2026-83711 is a critical-severity flaw (CVSS 10.0) affecting azure active directory b2c. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Authorization bypass through user-controlled key in Microsoft Azure Active Directory B2C allows an unauthorized attacker to elevate privileges over a network.

Why this priority

Critical severity
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	10.0 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.8% (top 44%)
CISA exploited list	No
Weakness	CWE-639
Published	2026-09-03
Last modified	2026-10-14

Publisher (CNA): Microsoft Corporation · Vendor: microsoft

Last updated 2026-10-14 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-03 23:17 UTCPublished CVE record published
2026-10-14 18:38 UTCUpdated Record last modified

microsoft azure active directory b2c MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy azure-active-directory-b2c || rpm -q azure-active-directory-b2c || azure-active-directory-b2c --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora 46 · ddnet · FIXED · 20.2-1.fc46 · FEDORA-2026-6991b4ab14 · source

sudo dnf upgrade --advisory=FEDORA-2026-6991b4ab14

Fedora ELN · libplacebo · FIXED · 7.360.1-5.eln159 · FEDORA-2026-92226f221e · source

sudo dnf upgrade --advisory=FEDORA-2026-92226f221e

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-83711?

azure active directory b2c: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-83711 being exploited?

CVE-2026-83711 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-83711 affect?

CVE-2026-83711 affects azure active directory b2c. Severity is critical (CVSS 10.0). Authorization bypass through user-controlled key in Microsoft Azure Active Directory B2C allows an unauthorized attacker to elevate privileges over a network.

How urgent is CVE-2026-83711?

Priority 62/100. Critical severity; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Azure vulnerabilities · Active Directory vulnerabilities

References

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