# CVE-2026-40885: goshs: Public collaborator feed leaks .goshs ACL credentials and enables unauthorized access > Unauthenticated attackers can capture leaked ACL credentials from websocket feeds to bypass authorization and modify files in protected directories. - **Severity:** High 7.7 (`CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Over the internet - **Victim action needed:** A user has to click or open something - **Fix available:** Yes - **Published:** 21 Apr 2026 - **Updated:** 21 Apr 2026 - **Also known as:** GHSA-7h3j-592v-jcrp, GO-2026-5221 ## What is CVE-2026-40885? CVE-2026-40885 is a high-severity vulnerability in patrickhener goshs, published on 21 Apr 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link. ### Official description goshs is a SimpleHTTPServer written in Go. From 2.0.0-beta.4 to 2.0.0-beta.5, goshs leaks file-based ACL credentials through its public collaborator feed when the server is deployed without global basic auth. Requests to .goshs-protected folders are logged before authorization is enforced, and the collaborator websocket broadcasts raw request headers, including Authorization. An unauthenticated observer can capture a victim's folder-specific basic-auth header and replay it to read, upload, overwrite, and delete files inside the protected subtree. This vulnerability is fixed in 2.0.0-beta.6. Weakness: CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor) ## Which versions are affected by CVE-2026-40885? 4 open source packages ship an affected version, including github.com/patrickhener/goshs/v2 and github.com/patrickhener/goshs. It affects 1 product. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `github.com/patrickhener/goshs/v2` | Go | From 2.0.0-beta.4 | 2.0.0-beta.6 | | `github.com/patrickhener/goshs/v2` | Go | From 2.0.0-beta.4 | 2.0.0-beta.6 | | `github.com/patrickhener/goshs/v2` | Go | From 2.0.0-beta.4 | 2.0.0-beta.6 | | `github.com/patrickhener/goshs` | Go | All versions | None | Products: Goshs Goshs. ## How do I fix CVE-2026-40885? Upgrade github.com/patrickhener/goshs/v2 to 2.0.0-beta.6 or later. ## Is CVE-2026-40885 being exploited? It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-40885 exists. ## Other vulnerabilities in patrickhener goshs - [CVE-2026-40884](https://insights.sbomify.com/CVE-2026-40884/): goshs: Empty-username SFTP password authentication bypass in goshs (critical 9.8) - [CVE-2026-35392](https://insights.sbomify.com/CVE-2026-35392/): goshs has an Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in goshs PUT Upload (critical 9.8) - [CVE-2026-35393](https://insights.sbomify.com/CVE-2026-35393/): Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in goshs POST multipart upload (critical 9.8) - [CVE-2026-35471](https://insights.sbomify.com/CVE-2026-35471/): Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in goshs (critical 9.8) - [CVE-2026-40189](https://insights.sbomify.com/CVE-2026-40189/): goshs has a file-based ACL authorization bypass in goshs state-changing routes (critical 9.3) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2026-40885 and fix it if it is affected. What it is: CVE-2026-40885 is a high-severity vulnerability in patrickhener goshs, published on 21 Apr 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link. Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-40885 exists. Affected packages and fixed versions: - github.com/patrickhener/goshs/v2 (Go): affected from 2.0.0-beta.4; fixed in 2.0.0-beta.6 - github.com/patrickhener/goshs/v2 (Go): affected from 2.0.0-beta.4; fixed in 2.0.0-beta.6 - github.com/patrickhener/goshs/v2 (Go): affected from 2.0.0-beta.4; fixed in 2.0.0-beta.6 - github.com/patrickhener/goshs (Go): affected all versions; no fix listed Task: 1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies. 2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it. 3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead. 4. Run the tests and summarise what changed and why. 5. If nothing in the project is affected, say so and change nothing. Reference: https://insights.sbomify.com/CVE-2026-40885/ (Markdown: https://insights.sbomify.com/CVE-2026-40885/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2026-40885 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-40885 - OSV: https://osv.dev/vulnerability/CVE-2026-40885 --- From sbomify Insights: https://insights.sbomify.com/CVE-2026-40885/ Summaries are generated and may contain mistakes; the official description above is the record.