INCIBE-CERT Reports Fixed 1millionbot Chatbot XSS
Tech GuruQuick Answer
The authority published CVE-2026-91921 for 1millionbot AI Chatbot Platform SaaS before the coordinated fix. Cross-Site Scripting (XSS) vulnerability due to inadequate input sanitisation in the client-side rendering engine of the 1millionbot AI Chat Platform. An unauthenticated remote user could cause external hyperlinks to be rendered in the web interface by sending messages containing Markdown syntax and certain unsanitised content blocks. The impact is limited to the user’s own interactive session; no compromise of internal infrastructure, access to third-party data or impact on administrative panels has been identified. Affected deployments should be matched to the authority's exact scope and moved to the supported fixed release.
Confirm Scope And Apply The Supported Fix
What to do now: Inventory 1millionbot AI Chatbot Platform SaaS before the coordinated fix, match the exact affected release or feature, apply the authority-supported fixed build or service remediation, validate the dependent workflow, and preserve evidence.
Last verified: 2026-09-21 UTC. Recheck the authoritative advisory and supported distribution channel before changing production.
Scope And Authority
| Product scope | 1millionbot AI Chatbot Platform SaaS before the coordinated fix |
|---|---|
| Advisory | INCIBE-2026-651 |
| CVE | CVE-2026-91921 |
| Authoritative release date | 2026-09-21 09:43:37.622 UTC |
| Authority revision date | 2026-09-21 11:12:43.964 UTC |
| Affected versions | 1millionbot AI Chatbot Platform SaaS before the coordinated fix |
| Fixed version | Managed-service fix applied by 1millionbot; no customer build number |
| CVSS base score | 5.1 (CVSS v4.0) |
| CVSS severity | Medium |
| Exploitation status | Not stated by the authority; no exploitation claim is inferred. |
What Changed
Cross-Site Scripting (XSS) vulnerability due to inadequate input sanitisation in the client-side rendering engine of the 1millionbot AI Chat Platform. An unauthenticated remote user could cause external hyperlinks to be rendered in the web interface by sending messages containing Markdown syntax and certain unsanitised content blocks. The impact is limited to the user’s own interactive session; no compromise of internal infrastructure, access to third-party data or impact on administrative panels has been identified.
What To Validate Now
- Inventory. Locate 1millionbot AI Chatbot Platform SaaS before the coordinated fix deployments, versions, enabled features, exposure paths, owners, and dependent services.
- Establish applicability. Compare each deployment with the authority's affected-version statement: 1millionbot AI Chatbot Platform SaaS before the coordinated fix Do not infer applicability from product family or severity alone.
- Remediate. Apply Managed-service fix applied by 1millionbot; no customer build number through the supported vendor or project channel, following the current advisory and change-control requirements.
- Validate. Confirm the resulting version or managed-service state, exercise representative functionality and recovery paths, monitor for regressions, and document exceptions.
- Retain evidence. Preserve asset and owner identifiers, the applicability decision, before-and-after versions, change approval, installation output, validation results, and any exception or rollback record.
Operational Cautions
Use the exact supported release stream and repository. Test dependencies, clusters, integrations, and rollback before broad deployment; a CVSS rating or reachable feature is not evidence of exploitation.
Evidence To Retain
- Exact product, release stream, package or application version, enabled feature, environment, and accountable owner.
- UTC timestamps, authority revision, approved change record, installer or package-manager output, and resulting version.
- Relevant logs and monitoring evidence, test results, exceptions, compensating controls, and rollback decisions.
Related TechGeeks Resources
Authoritative References
Correction policy: If the authority changes affected versions, fixed versions, severity, exploitation information, mitigations, or required action, TechGeeks will update this notice and its verification date.
