PatchTheCVECVE-2026-21584: This High severity Improper Authorization vulnerability was introduced in versions 10.0.0, 10.1.0, 10.2.0, 11.
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Routine
HIGH 8.1UPGRADE
CVE-2026-21584 is a high-severity flaw (CVSS 8.1) affecting bamboo. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
This High severity Improper Authorization vulnerability was introduced in versions 10.0.0, 10.1.0, 10.2.0, 11.0.0, 12.0.0, and 12.1.0 of Bamboo Data Center. This Improper Authorization vulnerability, with a CVSS Score of 7.6, allows an authenticated attacker to gain unintended access and can lead to the exposure of resources or functionality, possibly providing attackers with sensitive information or even execute arbitrary code. Atlassian
Why this priority
- High severity
A fixed release or distro patch exists.
Risk facts
| CVSS score | 8.1 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | Low |
| User interaction | None |
| EPSS exploit chance | 0.3% (top 77%) |
| CISA exploited list | No |
| Weakness | CWE-285 |
| Published | 2026-08-18 |
| Last modified | 2026-10-22 |
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
atlassian bamboo UPGRADE
Affected: >= 10.0.0 and < 10.2.22 · >= 11.0.0 and < 12.1.10
Fixed in: 10.2.22, 12.1.10
Safe to downgrade to: a release before 10.0.0
1. Check installed version
apt-cache policy bamboo || rpm -q bamboo || bamboo --version
2. UPGRADE to 10.2.22 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade bamboo
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade bamboo
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 10.0.0 (Debian / Ubuntu)
apt-cache madison bamboo
sudo apt install bamboo=<VERSION_BEFORE_10.0.0>
sudo apt-mark hold bamboo
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list bamboo
sudo dnf downgrade bamboo-<VERSION_BEFORE_10.0.0>
sudo dnf versionlock add bamboo
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 46 · wasmedge · FIXED · 0.18.1-1.fc46 · FEDORA-2026-4c27216e39 · source
sudo dnf upgrade --advisory=FEDORA-2026-4c27216e39
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.
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.