CVE-2026-75757
Cookie parsing flaw lets sibling subdomains hijack admin sessions.
Is CVE-2026-75757 being exploited?
Not confirmed. CVE-2026-75757 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 0.30% probability of exploitation in the next 30 days.
How severe is CVE-2026-75757?
CVE-2026-75757 is rated High with a CVSS score of 8.3. 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-2026-75757?
Yes. A fix has been recorded for CVE-2026-75757. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-75757 affect?
CVE-2026-75757 affects ash_admin >=0.9.1 and <1.3.1. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-75757?
Upgrade ash_admin to >=1.3.1; invalidate admin sessions; restrict cookie Domain.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Sibling subdomain can inject shadow cookies to rebind admin sessions, enabling admin impersonation, tenant takeover, and unauthorized admin actions.
Immediate action required
- affected>= 0.9.1 and < 1.3.1
- affected>= 77a43cc4fa04cb59c38fc434568a35a38ecb995a and < e93a3408a85035e1f90275d02bc2470c96095e56
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.