Security readout for executives and security teams
Plain-English summary
Casdoor can accept SAML login responses without confirming Casdoor started that login. If an attacker controls a registered upstream identity provider, Casdoor may issue a session from an unsolicited or replayed response. This can allow unauthorized access without user interaction.
Executive priority
Prioritize as critical where Casdoor provides authentication for internal or customer-facing systems. Unauthorized session issuance can directly affect confidentiality and integrity, even though availability impact is not emphasized in the CVSS vector.
Technical view
The /api/acs SAML callback in Casdoor 2.362.0 and earlier does not verify SAMLResponse correlation to a prior AuthnRequest. It can also process a provider snapshot even after an IdP is disabled or deleted during a flow. The issue is classified as CWE-346 with CVSS 9.1.
Likely exposure
Organizations using Casdoor 2.362.0 or earlier with SAML and registered upstream IdPs are the likely exposure group. The bundle does not identify other products or deployment-specific prerequisites beyond Casdoor and SAML IdP configuration.
Exploitation context
The source bundle does not show CISA KEV listing or confirmed active exploitation. The described risk requires a registered upstream IdP under attacker control, or replay of a legitimately captured response in another session or after the flow ends.
Researcher notes
Evidence is clear on the authentication validation flaw, affected version ceiling, endpoint, and replay/unsolicited-response behavior. Public sources in the bundle do not provide exploit-in-the-wild proof, patch version details, or a complete mitigation procedure.
Mitigation direction
- Inventory Casdoor deployments and identify versions 2.362.0 or earlier.
- Check Casdoor and CERT guidance for patched versions or official mitigations.
- Reduce trust in unnecessary or untrusted upstream SAML IdPs.
- Review and terminate suspicious SAML-authenticated sessions after remediation.
- Increase monitoring around /api/acs authentication outcomes.
Validation and detection
- Confirm whether Casdoor uses SAML authentication in production.
- Review configured upstream IdPs and who controls them.
- Check /api/acs logs for sessions lacking expected initiated login state.
- Verify vendor updates enforce AuthnRequest-to-response correlation.
- Document any disabled or deleted IdPs tied to recent SAML activity.
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-346: 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-2026-9098 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
- Critical
- CVSS
- 9.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
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
1 official scoreWe 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:H/I:H/A:N3.95.2CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
9.1CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
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.
- 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
Source materials
- CVE List V5 sourceCVE List V5
- https://kb.cert.org/vuls/id/780781CVE reference, certcc
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.
Origin Validation Error
Origin Validation Error represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.