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CVE-2026-25854 is an occasional open redirect vulnerability in Apache Tomcat's LoadBalancerDrainingValve. The flaw can redirect users to an untrusted site. It affects Tomcat 11.0.0-M1 through 11.0.18, 10.1.0-M1 through 10.1.52, 9.0.0.M23 through 9.0.115, and 8.5.30 through 8.5.100; unsupported versions may also be affected.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos (1 hidden).
This repository is a small vulnerability disclosure package for CVE-2026-25854 affecting Apache Tomcat 11.0.x, 10.1.x, and 9.x. It contains 5 files total: 4 Markdown documentation files and 1 Bash PoC script. The core exploit logic is in `poc/CVE-2026-25854.sh`, which uses `curl` to send a crafted request to a Tomcat instance at `http://localhost:8080` with a request URI beginning with `//victim02.com/...` and the header `X-LB-Activation:DIS`. The intended effect is to reproduce Tomcat's vulnerable `LoadBalancerDrainingValve` behavior when a node is in disabled/draining state, causing Tomcat to generate an HTTP 302 redirect with a protocol-relative `Location` header pointing to an attacker-controlled destination. The exploit capability is limited to proof-of-concept reproduction of a web/network open redirect condition rather than code execution. However, the included analysis explains the higher-level security impact: cross-system redirect, attacker-controlled propagation of session identifiers and query parameters, and possible session fixation or identity/authorization binding issues in downstream SSO/OIDC, OAuth, or payment flows. The repository is not part of a known exploit framework and is best classified as a standalone POC. It is not merely a detection script, and there is no evidence it is fake or destructive. Repository structure and purpose: `README.md` provides vulnerability metadata, affected versions, references, and points to the PoC and analysis; `analysis.md` explains root cause and impact centered on `LoadBalancerDrainingValve`; `timeline.md` records disclosure milestones; `DISCLOSURE.md` is a generic publication checklist; and `poc/CVE-2026-25854.sh` is the only executable artifact. Overall, the repository's purpose is to document and safely demonstrate an occasionally reachable open redirect in Tomcat cluster draining logic.
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Cross-references every affected SKU, including bundled OEM variants.
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