What’s Vulnerable › Vulnerabilities

CVE-2026-95813: e621ng before 26.09.16 Open Redirect via URL Parameters

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-22 · updated 2026-09-26
• Weakness: CWE-601

Description

e621ng versions before 26.09.16 pass untrusted request parameters directly to Rails url_for in PaginatorComponent and controller navigation links, allowing attackers to redirect pagination and navigation controls to attacker-controlled origins. Attackers can supply host, protocol, and port query parameters that are interpreted as URL generation options, causing pagination links to point to malicious domains while the initial page loads from the legitimate site.

Affected products

• e621ng: before 26.09.16 — fixed in 26.09.16

How to fix

Upgrade to a fixed version: e621ng 26.09.16. Check the vendor advisory for mitigations.

References

• https://github.com/e621ng/e621ng
• https://github.com/e621ng/e621ng/blob/26.09.02/app/components/paginator_component.rb
• https://github.com/e621ng/e621ng/commit/e1a3930bf1750b02a23843ec88c33e2aa06e2a5e
• https://github.com/e621ng/e621ng/pull/2518
• https://github.com/e621ng/e621ng/releases/tag/26.09.16
• https://www.vulncheck.com/advisories/e621ng-before-26.09.16-open-redirect-via-url-parameters

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