# CVE-2026-63647: CordysCRM SSE Notification Stream Hijack via `/sse/subscribe`

> Unauthenticated attackers can hijack Server-Sent Events streams to read, inject, or terminate other users' notifications in CordysCRM.

- **Severity:** Critical 9.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 18 Sep 2026
- **Updated:** 18 Sep 2026
- **Also known as:** GHSA-9qg8-cm35-xqp4

## What is CVE-2026-63647?

CVE-2026-63647 is a critical missing authorization vulnerability in 1Panel-dev CordysCRM, published on 18 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

CordysCRM is an open source AI-powered customer relationship management system that supports private deployment. Prior to 1.7.2, SseController exposes the anonymous /sse/subscribe, /sse/broadcast, and /sse/close endpoints because ShiroFilter.addPublicPathFilters permits the SSE paths, and the endpoints trust the caller-controlled userId instead of deriving an identity from an authenticated principal. An unauthenticated caller can use /sse/subscribe to read another user's workflow events, approval requests, mentions, and alerts, use /sse/broadcast to inject SYSTEM_HEARTBEAT messages into another user's stream, or use /sse/close to terminate another user's channel. This vulnerability is fixed in 1.7.2.

Weakness: CWE-639 (Authorization Bypass Through User-Controlled Key), CWE-306 (Missing Authentication for Critical Functionality)

## Which versions are affected by CVE-2026-63647?


## How do I fix CVE-2026-63647?

No fix has been published for CVE-2026-63647 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-63647 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-63647 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-63647 and fix it if it is affected.

What it is: CVE-2026-63647 is a critical missing authorization vulnerability in 1Panel-dev CordysCRM, published on 18 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-63647 exists.

Affected product: 1Panel-dev CordysCRM. No package-level version data is available, so check the vendor advisory linked from the reference page.

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-2026-63647/ (Markdown: https://insights.sbomify.com/CVE-2026-63647/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-63647
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-63647
- OSV: https://osv.dev/vulnerability/CVE-2026-63647

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-63647/
Summaries are generated and may contain mistakes; the official description above is the record.