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major vulnerability· requires attention

Keycloak/Red Hat SSO is widely used for enterprise IAM. This flaw lets authenticated users bypass policy enforcement to reach admin/private endpoints, posing broad access control risk.

Applications

CVE-2026-74909

8.1
High
EPSS 0.85%Patch available

Keycloak policy enforcer bypass via encoded characters allows unauthorized access.

exploited
No known exploitation not in CISA KEV as of our last sync
fix
Patch available see the advisory in the references
likelihood
EPSS 0.85%top 42% of scored CVEs
Published 16 Sept 2026Analysed here 18 Sept 2026CVSS scored by the publisher (CNA)
common questions

Is CVE-2026-74909 being exploited?

Not confirmed. CVE-2026-74909 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.85% probability of exploitation in the next 30 days.

How severe is CVE-2026-74909?

CVE-2026-74909 is rated High with a CVSS score of 8.1. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.

Is there a patch for CVE-2026-74909?

Yes. A fix has been recorded for CVE-2026-74909. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.

What does CVE-2026-74909 affect?

CVE-2026-74909 affects Keycloak (policy enforcer), Red Hat Single Sign-On / Red Hat SSO. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.

What should I do about CVE-2026-74909?

Apply vendor patches immediately; block/normalize encoded special chars in request handling.

Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.

executive summary
technical analysis
affected
Keycloak (policy enforcer)Red Hat Single Sign-On / Red Hat SSO
impact

Authenticated users can use encoded chars (e.g., semicolons, traversal) to bypass the policy enforcer and access administrative or private application endpoints.

action required

Immediate action required

cisa ssvc

exploitation
none
automatable
no
technical impact
total

Assessed by CISA 18 Sept 2026 (SSVC 2.0.3).

timeline

  1. 16 Sept 2026Published
  2. 18 Sept 2026Analysed by vulneraibility.com · 2 days later
  3. 18 Sept 2026CISA SSVC assessment: exploitation none · same day later
  4. 18 Sept 2026CVE record last updated · same day later
how to fix
Remediation steps are tailored for users whose stack is affected. Add this technology to your stack to see the fix checklist.
references
NVDCVE.orgCVE DetailsSource
6 references in the CVE record: 4 advisories, 2 links

sources

  • CVE List (CVE.org): description, affected versions, references; CVE Terms of Use
  • NVD: CVSS and CPE data
  • CISA Vulnrichment (ADP): SSVC decision points
  • FIRST EPSS: exploit probability and percentile
  • Summary, impact and triage tags: written by our AI analysis pipeline from the sources above. Check them against the sources.
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