CVE-2026-22797: openstack keystonemiddleware Authentication Bypass by Spoofing
Vulnerability summary
CVE-2026-22797 is a critical (CVSS 9.9) Authentication Bypass by Spoofing vulnerability in openstack keystonemiddleware. EPSS estimates a 0.65% chance of exploitation in the next 30 days, higher than 50.2% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 0 · Related 1Timeline
- 19-01-2026PublishedVulnerability first disclosed.
- 10-09-2026Last modifiedVulnerability information updated.
Description
An issue was discovered in OpenStack keystonemiddleware 10.5 through 10.7 before 10.7.2, 10.8 and 10.9 before 10.9.1, and 10.10 through 10.12 before 10.12.1. The external_oauth2_token middleware fails to sanitize incoming authentication headers before processing OAuth 2.0 tokens. By sending forged identity headers such as X-Is-Admin-Project, X-Roles, or X-User-Id, an authenticated attacker may escalate privileges or impersonate other users. All deployments using the external_oauth2_token middleware are affected.
CVSS metrics
4 scores · 4 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated9.9CriticalCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L
- OSV · DebianEcosystem advisory · calculated9.9CriticalCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L
- NVDNIST9.9CriticalCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L
EPSS trend
Probability
0.65%
Chance of exploitation in the next 30 days
Percentile
50%
Versus all other CVEs
30-day change
-0.01 pp
From 0.66% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Debian1 product
- python-keystonemiddleware< 10.12.0-3 | < 10.9.0-2+deb13u1
Openstack1 product
- keystonemiddleware≥ 10.5.0, < 10.7.2 | ≥ 10.8.0, < 10.9.1 | ≥ 10.10.0, < 10.12.1
Opensuse1 product
- python-keystonemiddleware&distro=openSUSE Tumbleweed< 10.12.0-2.1
Ubuntu1 product
- python-keystonemiddleware< 10.6.0-0ubuntu1.1 | < 10.12.0-0ubuntu1.1
4 vendors · 4 products
