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CVE-2026-32856: Ellucian Banner Self-Service Reflected XSS via dateConverter

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-09 · updated 2026-07-23
• Weakness: CWE-79

Description

Ellucian Banner Self-Service before the April T2 release (2025-04-23) contains a reflected cross-site scripting vulnerability that allows unauthenticated attackers to execute arbitrary JavaScript in a victim's browser by injecting unsanitized input through the toDateFormat request parameter in the dateConverter endpoint. Attackers can craft a malicious URL targeting the unauthenticated dateConverter endpoint to steal session cookies or perform other malicious actions in the context of the victim's browser session.

Affected products

• Ellucian Banner Self-Service: before April T2; 9.23 — fixed in April T2

How to fix

Upgrade to a fixed version: Ellucian Banner Self-Service April T2. Check the vendor advisory for mitigations.

References

• https://www.ellucian.com/assets/en/brochure/brochure-learn-more-about-ellucian-banner-self-service.pdf
• https://www.ellucian.com/security-researcher-hall-of-fame
• https://www.vulncheck.com/advisories/ellucian-banner-self-service-reflected-xss-via-dateconverter

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