How severe is GHSA-rfh5-c9h5-q8jm?

GHSA-rfh5-c9h5-q8jm has a CVSS score of 3.1/10, rated LOW. Review your exposure and patch according to your risk tolerance.

Which packages are affected by GHSA-rfh5-c9h5-q8jm?

GHSA-rfh5-c9h5-q8jm affects the following packages: reflex (PyPI). Ecosystems affected: PyPI.

How do I fix GHSA-rfh5-c9h5-q8jm?

No patched version of reflex has shipped for GHSA-rfh5-c9h5-q8jm yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.

How do I detect GHSA-rfh5-c9h5-q8jm in my PyPI dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for reflex. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.

How do I mitigate GHSA-rfh5-c9h5-q8jm if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

How does O3 Security protect against GHSA-rfh5-c9h5-q8jm?

O3 pinpoints whether GHSA-rfh5-c9h5-q8jm is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Is GHSA-rfh5-c9h5-q8jm actively exploited in the wild?

No public exploit code has been indexed for GHSA-rfh5-c9h5-q8jm yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for GHSA-rfh5-c9h5-q8jm?

GHSA-rfh5-c9h5-q8jm has an EPSS (Exploit Prediction Scoring System) score of 0.2%, placing it in the 14th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is GHSA-rfh5-c9h5-q8jm?

GHSA-rfh5-c9h5-q8jm is classified as Open Redirect (CWE-601). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was GHSA-rfh5-c9h5-q8jm published, and has it been updated?

GHSA-rfh5-c9h5-q8jm was published on October 15, 2025 and was last updated on October 16, 2025. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐍 PyPI

GHSA-rfh5-c9h5-q8jm

LOW

reflex-dev/reflex has an Open Redirect vulnerability

Also known asCVE-2025-62379

Published

Oct 15, 2025

Updated

Oct 16, 2025

Affected

1 pkg

Patched

None yet

Exploits

None indexed

EPSS Exploitation Probability

via FIRST.org ↗

0.2%probability of exploitation in next 30 days

Lower Risk14th percentile+0.17%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Blast Radius

1 pkg affected

🐍reflex

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.

Description

Mitigation

Make sure GITHUB_CODESPACES_PORT_FORWARDING_DOMAIN is not set in a production environment. So the following is correct:

assert os.getenv("GITHUB_CODESPACES_PORT_FORWARDING_DOMAIN") is None

Vulnerability Description

Vulnerability Overview

When the GET /auth-codespace page loads in a GitHub Codespaces environment, it automatically assigns the redirect_to query parameter value directly to client-side links without any validation and triggers automatic clicks. This allows attackers to redirect users to arbitrary external URLs.
The route is only registered when a Codespaces environment is detected, and the detection is controlled by environment variables. This means that the same behavior can be activated in production if the corresponding environment variable is set.

Vulnerable Code Analysis

https://github.com/reflex-dev/reflex/blob/51f9f2c2f52cac4d66c07683a12bc0237311b6be/reflex/utils/codespaces.py#L18-L46

This code assigns the redirect_to query parameter directly to a.href without any validation and immediately triggers a click (automatic navigation), allowing users to be sent to arbitrary external domains, resulting in an open redirect vulnerability.
The execution condition is simply based on the presence of a sessionStorage flag, meaning it triggers immediately on first visits or in incognito/private browsing windows, with no server-side origin/scheme whitelist or internal path enforcement defenses in place.

PoC

PoC Description

Used the production configuration from docker-example (docker-example/production-compose).
Added a Codespaces detection environment variable to the app container in compose.yaml to forcibly expose the route.
GITHUB_CODESPACES_PORT_FORWARDING_DOMAIN: dummy
The reverse proxy (Caddy) needs to be configured to forward /auth-codespace to the backend (required depending on the environment).

curl Example

https://localhost/auth-codespace?redirect_to=http://google.com

PoC MP4 https://file.notion.so/f/f/d105d145-04bc-45c5-b46c-ed880895e9de/a86c3e3b-f67f-45d1-8fa2-4aa0ba7d0068/poc.mp4?table=block&id=26955717-5d2e-805a-b53c-e25ee03f1d4b&spaceId=d105d145-04bc-45c5-b46c-ed880895e9de&expirationTimestamp=1760508000000&signature=ZPp8PVldfGOh0gB5tVElRV6GN789R-EG0oxZgkFjjLU&downloadName=poc.mp4

Impact

Phishing/Social Engineering Attacks

Users can be exploited by immediately redirecting from a trusted domain to external malicious sites, taking advantage of user trust. This enables login page spoofing, credential harvesting, and redirection to malware distribution pages.

Authentication/Session Flow Disruption

When users with valid sessions/cookies from the same origin click the link, they are redirected to unintended external domains, which can bypass or disrupt authentication/authorization flows. When combined with redirect-based flows like OAuth/OIDC, this can escalate into security incidents.

Affected Packages

1 total

Ecosystem	Package	Vulnerable range	Fix
🐍PyPI	`reflex`	≥ 0.5.4	No fix

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for reflex. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Remediation status
No patched version of reflex has shipped for GHSA-rfh5-c9h5-q8jm yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.
Mitigate without a patch
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 pinpoints whether GHSA-rfh5-c9h5-q8jm is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Tailored to GHSA-rfh5-c9h5-q8jm. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

### Mitigation Make sure `GITHUB_CODESPACES_PORT_FORWARDING_DOMAIN` is not set in a production environment. So the following is correct: ``` assert os.getenv("GITHUB_CODESPACES_PORT_FORWARDING_DOMAIN") is None ``` ### **Vulnerability Description** --- **Vulnerability Overview** - When the GET /auth-codespace page loads in a GitHub Codespaces environment, it automatically assigns the redirect_to query parameter value directly to client-side links without any validation and triggers automatic clicks. This allows attackers to redirect users to arbitrary external URLs. - The route is only r

O3 Security · Impact-Aware SCA

Is GHSA-rfh5-c9h5-q8jm in your dependencies?

O3 detects GHSA-rfh5-c9h5-q8jm across PyPI dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

Scan my dependencies How O3 SCA works