CVE-2026-95813 e621ng CVE debrief

Who should care

Defenders responsible for e621ng installations, as well as security teams monitoring for suspicious redirects and navigation control manipulation, should assess exposure and prioritize verification and remediation.

Why it matters

CVE-2026-95813 is an open redirect vulnerability in e621ng versions before 26.09.16, allowing attackers to redirect pagination and navigation controls to attacker-controlled origins. Defenders should prioritize verifying and updating e621ng installations, as well as monitoring for suspicious redirects and navigation control manipulation.

• Potential for attackers to manipulate navigation controls and redirect users to malicious domains
• Possible impact on user trust and perception of the e621ng platform
• Need for defenders to verify and update e621ng installations to prevent exploitation

Technical summary

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. This vulnerability can be exploited by supplying host, protocol, and port query parameters, causing pagination links to point to malicious domains while the initial page loads from the legitimate site. Defenders should prioritize verifying and updating e621ng installations to version 26.09.16 or later to prevent exploitation.

Defensive priority

Defenders should prioritize verifying and updating e621ng installations to version 26.09.16 or later.

Recommended defensive actions

• Verify e621ng installations and update to version 26.09.16 or later
• Review and restrict user input to prevent supply of malicious query parameters
• Monitor for suspicious redirects and navigation control manipulation
• 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 record and NVD entry provide details on the vulnerability, but the scope of affected versions and potential impact require further verification. The e621ng versions before 26.09.16 are vulnerable, and defenders should verify and update installations to prevent exploitation. The CVE Program record and NVD detail page offer source-provided CVE metadata and vulnerability assessment. However, additional review of vendor documentation and security advisories may be necessary to fully understand the vulnerability and its impact.

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.