CVE-2026-77850 ash-project CVE debrief

Who should care

Administrators and users of ash_admin, especially those with lower privileges, should be aware of this vulnerability and take necessary precautions to prevent potential XSS attacks. This includes reviewing the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance. They should also plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.

Technical summary

The relationship typeahead components AshAdmin.Components.Resource.RelationshipField and AshAdmin.Components.Resource.ManagedRelationshipSelectField highlight the matched search term by wrapping it in <b> tags and rendering the whole string with Phoenix.HTML.raw/1. The highlighted value is the destination record's label_field, ordinary database content that is often written by lower-privileged users. Because raw/1 disables output escaping for the entire string, a stored label such as <img src=x onerror=...> runs as JavaScript in the admin's session as soon as a matching record appears in the dropdown, giving the attacker the admin's privileges over everything AshAdmin exposes.

Defensive priority

Administrators using ash_admin should prioritize patching to prevent potential XSS attacks.

Recommended defensive actions

• Patch ash_admin to version 1.3.1 or later
• Restrict access to sensitive areas of ash_admin
• Monitor for suspicious activity in ash_admin
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE-2026-77850 vulnerability is a stored Cross-site Scripting (XSS) issue in ash_admin, which executes attacker-supplied record content as script in an administrator's browser. The vulnerability affects ash_admin versions from 0.13.0 before 1.3.1. Limited information is available about the CVE Program record and NIST NVD detail page. The CVE record was published on 2026-08-31T03:16:42.307Z and has not been modified since then. Evidence is limited to supplied source corpus.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.