# Cassandra Web - Remote File Read

Advisory record · `GHSA-8mfv-xhp5-48q9`

- **Identifiers:** `GHSA-8mfv-xhp5-48q9` · `CVE-2020-36939`
- **State:** Confirmed
- **Severity:** CVSS 8.7 High
- **Critical:** No
- **Weakness (CWE):** [CWE-22](https://cwe.mitre.org/data/definitions/22.html)
- **Tags:** [Path traversal](https://agentprime.io/advisories/tag/path-traversal.md)
- **Published:** 27 Jan 2026
- **Updated:** 8 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 27 Jan 2026, 18:32 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `cassandra-web` (RubyGems): affected `<=0.5.0`; no fixed version yet

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 8.7 High, CVSS 4.0: `CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N`, from CNA (VulnCheck)

- **CISA KEV:** Not listed.
- **EPSS:** 0.030, the 87th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 15:16 UTC: First seen by agentprime
- 31 Oct 2026, 15:16 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-8mfv-xhp5-48q9)

## Sources

- [GitHub Advisory Database: GHSA-8mfv-xhp5-48q9](https://github.com/advisories/GHSA-8mfv-xhp5-48q9)
- [OSV: GHSA-8mfv-xhp5-48q9](https://osv.dev/vulnerability/GHSA-8mfv-xhp5-48q9)
- <https://nvd.nist.gov/vuln/detail/CVE-2020-36939>
- <https://github.com/avalanche123/cassandra-web>
- <https://github.com/rubysec/ruby-advisory-db/blob/master/gems/cassandra-web/CVE-2020-36939.yml>
- <https://rubygems.org/gems/cassandra-web/versions/0.5.0>
- <https://www.exploit-db.com/exploits/49362>
- <https://www.vulncheck.com/advisories/cassandra-web-remote-file-read>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-8mfv-xhp5-48q9>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-8mfv-xhp5-48q9/>. Everything for agents: <https://agentprime.io/llms.txt>.