Openstack Keystone Incorrect Authorization vulnerability
CVE-2021-3563 · GHSA-cc99-whm5-mmq3 · PYSEC-2026-370 · published 27 Aug 2022
How serious is it
- Severity: critical, CVSS score 9.1 out of 10.
- No exploit prediction (EPSS) score yet.
- Not on the CISA list of exploited vulnerabilities.
- No public exploit in Exploit-DB.
Is your app affected by CVE-2021-3563?
Paste this prompt into Claude Code, Cursor or any AI coding tool: it runs a free Shippable scan of your project and fixes what it finds. Built with Lovable, Bolt or v0? Scan your live app. Or upload your package file.
Who is affected
keystone(PyPI) <= 21.0.0
How to check
- Run
pip show keystonein your project to see the installed version, including copies pulled in by other packages. - Or paste your lockfile into the checker: it lists every package with a known vulnerability, this one included.
- Or run
npx shippable-dev scan localhost:3000in your project folder. It reads your lockfile and flags this vulnerability along with every other known one.
How to fix
Copies a prompt for Claude Code, Cursor or Codex: it checks your lockfiles for this and upgrades it.
- No fixed version of
keystoneyet. Replace or remove it, or apply the workaround in the advisory below. - If a vulnerable version was live, check your logs and rotate the secrets that server could read.
The advisory
A flaw was found in openstack-keystone, only the first 72 characters of an application secret are verified allowing attackers bypass some password complexity which administrators may be counting on. The highest threat from this vulnerability is to data confidentiality and integrity. A [patch](https://opendev.org/openstack/keystone/commit/7859ed26003858ebfd9a5e866b43f1a6a9e83dca) is available.
Check your whole app
Dependencies are only half of it. Free and read-only: before you push, run npx shippable-dev scan localhost:3000 in your project folder, no account needed. For your live app, you prove it's yours with a one-line tag first.
References
- nvd.nist.gov/vuln/detail/CVE-2021-3563
- access.redhat.com/security/cve/CVE-2021-3563
- bugs.launchpad.net/ossa/+bug/1901891
- bugzilla.redhat.com/show_bug.cgi?id=1962908
- security-tracker.debian.org/tracker/CVE-2021-3563
- review.opendev.org/c/openstack/keystone/+/803641
- review.opendev.org/c/openstack/keystone/+/828595
- review.opendev.org/c/openstack/keystone/+/856489
- lists.debian.org/debian-lts-announce/2024/01/msg00007.html
- opendev.org/openstack/keystone/commit/7859ed26003858ebfd9a5e866b43f1a6a9e83dca
- github.com/pypa/advisory-database/tree/main/vulns/keystone/PYSEC-2026-370.yaml
- opendev.org/openstack/keystone
- pypi.org/project/keystone
- github.com/advisories/GHSA-cc99-whm5-mmq3
Merged from GitHub Advisory Database, OSV. Last updated 28 Oct 2026. All vulnerabilities · RSS · JSON