# CVE-2026-61592: djust: SSE sessions are not bound to the authenticated user; the client-chosen session_id is the sole authorization capability (session hijack)

> Attackers can hijack SSE sessions by guessing client-chosen IDs, executing actions as the victim due to missing user binding.

- **Severity:** High 7.4 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 16 Sep 2026
- **Updated:** 17 Sep 2026
- **Also known as:** GHSA-f795-p5jw-j6g2, PYSEC-2026-4043

## What is CVE-2026-61592?

CVE-2026-61592 is a high-severity missing authorization vulnerability in djust-org djust, published on 16 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

djust provides Phoenix LiveView-style reactive server-side rendering for Django with Rust-powered performance. Prior to version 1.0.7, SSE sessions were keyed solely by a client-chosen `session_id` with no binding to the authenticated user — a control the WebSocket transport has but that was dropped on SSE. An attacker who learns (or a victim who leaks) a `session_id` could connect to the message endpoint and dispatch event handlers that execute with the victim's identity and state. This is fixed in djust 1.0.7. Each SSE session is bound to its owning principal at creation and cross-principal access is rejected; SSE session creation is additionally capped per principal. As a workaround, disable the SSE transport.

Weakness: CWE-862 (Missing Authorization), CWE-639 (Authorization Bypass Through User-Controlled Key), CWE-384 (Session Fixation)

## Which versions are affected by CVE-2026-61592?

3 open source packages ship an affected version, including djust.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `djust` | PyPI | All versions | 1.0.7 |
| `djust` | PyPI | All versions | 1.0.7 |
| `djust` | PyPI | All versions | 1.0.7 |

## How do I fix CVE-2026-61592?

Upgrade djust to 1.0.7 or later.

## Is CVE-2026-61592 being exploited?

There is no known exploitation of CVE-2026-61592 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-61592 and fix it if it is affected.

What it is: CVE-2026-61592 is a high-severity missing authorization vulnerability in djust-org djust, published on 16 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-61592 in the wild and no public exploit code.

Affected packages and fixed versions:
- djust (PyPI): affected all versions; fixed in 1.0.7
- djust (PyPI): affected all versions; fixed in 1.0.7
- djust (PyPI): affected all versions; fixed in 1.0.7

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-2026-61592/ (Markdown: https://insights.sbomify.com/CVE-2026-61592/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-61592
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-61592
- OSV: https://osv.dev/vulnerability/CVE-2026-61592

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-61592/
Summaries are generated and may contain mistakes; the official description above is the record.