Security readout for executives and security teams
Plain-English summary
CVE-2026-7307 is a denial-of-service flaw in Red Hat build of Keycloak. An unauthenticated remote actor can send specially crafted SAML XML that drives high CPU use and worker thread starvation, making authentication services unavailable.
Executive priority
Treat as high priority for organizations relying on Keycloak SAML login. The primary business risk is authentication outage, which can block workforce, customer, or partner access to dependent applications.
Technical view
The issue affects SAML endpoint processing in Red Hat build of Keycloak 26.2 and 26.4 packages listed by Red Hat. CVSS 3.1 is 7.5, network exploitable, low complexity, no privileges, no user interaction, and availability impact only.
Likely exposure
Exposure is most likely where Red Hat build of Keycloak 26.2 or 26.4 has reachable SAML endpoints. The source bundle identifies specific rhbk/keycloak-rhel9, operator, and operator-bundle package versions as affected.
Exploitation context
The source bundle does not report active exploitation, and KEV is false. The described attack is remote and unauthenticated, but sources only support denial of service, not data theft or privilege escalation.
Researcher notes
Evidence supports a SAML XML parsing or processing DoS mapped to CWE-1286. Do not assume upstream Keycloak or non-Red Hat builds are affected unless vendor data confirms it.
Mitigation direction
- Apply the relevant Red Hat advisory updates for affected RHBK 26.2 or 26.4 deployments.
- Prioritize internet-facing or partner-facing SAML endpoints first.
- Confirm package versions against Red Hat affected and unaffected status.
- Monitor Keycloak CPU saturation, worker exhaustion, and authentication availability.
- Check vendor guidance before applying compensating controls not named in sources.
Validation and detection
- Inventory Red Hat build of Keycloak versions and package names.
- Identify deployments with SAML endpoints reachable from untrusted networks.
- Compare installed versions to Red Hat CVE and CSAF VEX records.
- Review logs and metrics for unexplained CPU spikes or authentication outages.
- Verify update status after applying Red Hat errata.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-1286: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-7307 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
2 official scoresWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6redhatCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6redhat-SADPVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- ADP timelineredhat-SADP
Reported to Red Hat.
- Source timelineredhat
Reported to Red Hat.
- ADP timelineredhat-SADP
Made public.
- Source timelineredhat
Made public.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
- 2026-05-12T16:20:11.587Z: Reported to Red Hat.
- 2026-05-19T10:42:34.560Z: Made public.
Source materials
- CVE List V5 sourceCVE List V5
- RHSA-2026:19594CVE reference, redhat · vendor-advisory, x_refsource_REDHAT
- RHSA-2026:19595CVE reference, redhat · vendor-advisory, x_refsource_REDHAT
- RHSA-2026:19596CVE reference, redhat · vendor-advisory, x_refsource_REDHAT
- RHSA-2026:19597CVE reference, redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2026-7307CVE reference, redhat · vdb-entry, x_refsource_REDHAT
- RHBZ#2476526CVE reference, redhat · issue-tracking, x_refsource_REDHAT
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-7307.jsonCVE reference, redhat-SADP · x_sadp-csaf-vex
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Validation of Syntactic Correctness of Input
Improper Validation of Syntactic Correctness of Input represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.