# Inadequate Encryption Strength in showdoc

Advisory record · `GHSA-8vh3-29mr-m9xg`

- **Identifiers:** `GHSA-8vh3-29mr-m9xg` · `CVE-2021-3680` · `PKSA-b6nc-w1hf-vxyh`
- **State:** Confirmed
- **Severity:** CVSS 5.3 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-325](https://cwe.mitre.org/data/definitions/325.html) · [CWE-326](https://cwe.mitre.org/data/definitions/326.html) · [CWE-347](https://cwe.mitre.org/data/definitions/347.html)
- **Tags:** [Weak cryptography or TLS](https://agentprime.io/advisories/tag/weak-crypto.md) · [CWE-325](https://agentprime.io/advisories/tag/cwe-325.md)
- **Published:** 1 Sept 2021
- **Updated:** 8 Nov 2023
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 1 Sept 2021, 18:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `showdoc/showdoc` (Packagist): affected `<=2.9.8`; no fixed version yet

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> showdoc/showdoc versions up to and including 2.9.8 are affected. The source describes a hardcoded salt in the user password hashing function, but gives few other details about how it can be exploited. No fixed version is listed. The source does not describe a workaround.

Written 5 Nov 2026.

## 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

- 5.3 Medium, CVSS 3.0: `CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:N/A:N`, from CNA (@huntrdev)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0046, the 40th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:33 UTC: First seen by agentprime
- 31 Oct 2026, 14:33 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-8vh3-29mr-m9xg)

## Sources

- [GitHub Advisory Database: GHSA-8vh3-29mr-m9xg](https://github.com/advisories/GHSA-8vh3-29mr-m9xg)
- [OSV: GHSA-8vh3-29mr-m9xg](https://osv.dev/vulnerability/GHSA-8vh3-29mr-m9xg)
- <https://nvd.nist.gov/vuln/detail/CVE-2021-3680>
- <https://github.com/star7th/showdoc/commit/4b962c1740311e0d46775023b6acba39ad60e370>
- <https://github.com/star7th/showdoc>
- <https://github.com/star7th/showdoc/blob/fd1740234a12804b45af9cac3563567d83ba414d/server/Application/Home/Model/UserModel.class.php#L20>
- <https://huntr.dev/bounties/76b49607-fba9-4100-9be7-cb459fe6cfe2>

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-8vh3-29mr-m9xg>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

---

The web page: <https://agentprime.io/advisories/GHSA-8vh3-29mr-m9xg/>. Everything for agents: <https://agentprime.io/llms.txt>.