CVE-2026-82311: Apache Airflow FAB provider: resetting a user's password does not delete that user's existing database-backed

This week

CRITICAL 9.8REMOTEWATCHLISTUPGRADE

CVE-2026-82311 is a critical-severity flaw (CVSS 9.8) affecting apache-airflow-providers-fab. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Apache Airflow FAB provider: resetting a user's password does not delete that user's existing database-backed sessions, despite documented behaviour that it does. The cleanup compares the string identifier Flask-Login stores in the session against the user's integer database identifier, so the comparison never matches and no session is removed. An attacker who already holds a copy of the victim's session cookie keeps access as that user after the

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	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.0% (top 38%)
CISA exploited list	No
Weakness	CWE-613
Published	2026-09-16
Last modified	2026-09-18

Publisher (CNA): Apache Software Foundation · Vendor: apache

Last updated 2026-09-18 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-16 09:17 UTCPublished CVE record published
2026-09-18 14:28 UTCUpdated Record last modified

apache apache-airflow-providers-fab UPGRADE

Affected: >= 2.4.2 and < 3.9.0

Fixed in: 3.9.0

Safe to downgrade to: a release before 2.4.2

1. Check installed version

apt-cache policy apache-airflow-providers-fab || rpm -q apache-airflow-providers-fab || apache-airflow-providers-fab --version

2. UPGRADE to 3.9.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade apache-airflow-providers-fab

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade apache-airflow-providers-fab

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 2.4.2 (Debian / Ubuntu)

apt-cache madison apache-airflow-providers-fab sudo apt install apache-airflow-providers-fab=<VERSION_BEFORE_2.4.2> sudo apt-mark hold apache-airflow-providers-fab

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list apache-airflow-providers-fab sudo dnf downgrade apache-airflow-providers-fab-<VERSION_BEFORE_2.4.2> sudo dnf versionlock add apache-airflow-providers-fab

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Exact fixes by distribution

Fedora ELN · xfsdump · FIXED · 3.3.0-3.eln159 · FEDORA-2026-6e9bb3f901 · source

sudo dnf upgrade --advisory=FEDORA-2026-6e9bb3f901

Fedora 46 · fio · FIXED · 3.43-2.fc46 · FEDORA-2026-b36219886b · source

sudo dnf upgrade --advisory=FEDORA-2026-b36219886b

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-2026-82311?

apache-airflow-providers-fab: upgrade to 3.9.0. Exact commands for each OS are on this page.

Is CVE-2026-82311 being exploited?

CVE-2026-82311 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-2026-82311 affect?

CVE-2026-82311 affects apache-airflow-providers-fab. Severity is critical (CVSS 9.8). Apache Airflow FAB provider: resetting a user's password does not delete that user's existing database-backed sessions, despite documented behaviour that it does. The cleanup compares the string identifier Flask-Login stores in the session

How urgent is CVE-2026-82311?

Priority 63/100. Critical severity; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Apache Airflow vulnerabilities · Flask vulnerabilities

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References

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