Open Redirect in E621ng
CVE-2026-95813
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.
Vulnerability class: Open Redirect
Published .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/e621ng/e621ng/pull/2518 (issue-tracking, patch)
- github.com/e621ng/e621ng/commit/e1a3930bf1750b02a23843ec88c33e2aa06e2a5e (patch)
- github.com/e621ng/e621ng/releases/tag/26.09.16 (release-notes)
- github.com/e621ng/e621ng/blob/26.09.02/app/components/paginator_component.rb (technical-description)
- github.com/e621ng/e621ng (product)
- www.vulncheck.com/advisories/e621ng-before-26.09.16-open-redirect-via-url-param… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-95813?
- CVE-2026-95813 is a medium-severity vulnerability in E621ng, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 6.1/10. Published 2026-09-22.
- How severe is CVE-2026-95813?
- Medium severity. CVSS v3 base score is 6.1 out of 10.