Flask vulnerable to possible disclosure of permanent session cookie due to missing Vary: Cookie header
When all of the following conditions are met, a response containing data intended for one client may be cached and subsequently sent by a proxy to other clients. If the proxy also caches Set-Cookie headers, it may send one client's session cookie to other clients. The severity depends on the application's use of the session, and the proxy's behavior regarding cookies. The risk depends on all these conditions being met.
- The application must be hosted behind a caching proxy that does not strip cookies or ignore responses with cookies.
- The application sets
session.permanent = True. - The application does not access or modify the session at any point during a request.
SESSION_REFRESH_EACH_REQUESTis enabled (the default).- The application does not set a
Cache-Controlheader to indicate that a page is private or should not be cached.
This happens because vulnerable versions of Flask only set the Vary: Cookie header when the session is accessed or modified, not when it is refreshed (re-sent to update the expiration) without being accessed or modified.
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Python (PyPI) | flask | >= 2.3.0, < 2.3.2, < 2.2.5 | 2.3.2, 2.2.5 |
Referencias
- https://github.com/pallets/flask/commit/70f906c51ce49c485f1d355703e9cc3386b1cc2b
- https://github.com/pallets/flask/releases/tag/2.3.2
- https://github.com/pallets/flask/releases/tag/2.2.5
- https://github.com/pallets/flask/security/advisories/GHSA-m2qf-hxjv-5gpq
- https://github.com/pallets/flask/commit/afd63b16170b7c047f5758eb910c416511e9c965
- https://nvd.nist.gov/vuln/detail/CVE-2023-30861
- https://github.com/pallets/flask
- https://github.com/pypa/advisory-database/tree/main/vulns/flask/PYSEC-2023-62.yaml
- https://lists.debian.org/debian-lts-announce/2023/08/msg00024.html
- https://security.netapp.com/advisory/ntap-20230818-0006
- https://www.debian.org/security/2023/dsa-5442
- Vector CVSS
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N- Debilidad (CWE)
CWE-539- Plataforma
- Python (PyPI)
- Paquete
flask- Publicada
- 01.05.2023
- Actualizado
- 11.10.2026 15:17
Fuentes y licencias
OSV / GitHub Advisory Database - PYSEC-2023-62 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-m2qf-hxjv-5gpq - CC BY 4.0
Historial de vulnerabilidades: flask
Todas las vulnerabilidades publicadas de este paquete (Python (PyPI)), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 5
- Primera → última
- 08.2018 02.2026
- Sin corrección
- 0
- Explotada en ataques
- 0
Distribución por gravedad
- Alta 3
- Baja 2
Divulgaciones por año
- 2018: 1
- 2019: 1
- 2020: 0
- 2021: 0
- 2022: 0
- 2023: 1
- 2024: 0
- 2025: 1
- 2026: 1
-
Flask vulnerable to possible disclosure of permanent session cookie due to missing Vary: Cookie header esta entrada
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