# Payload: Polymorphic join queries could disclose hidden fields

Advisory record · `GHSA-fpww-c55p-cjv6`

- **Identifiers:** `GHSA-fpww-c55p-cjv6` · `CVE-2026-105847`
- **State:** Confirmed
- **Severity:** CVSS 7.1 High
- **Critical:** No
- **Weakness (CWE):** [CWE-200](https://cwe.mitre.org/data/definitions/200.html) · [CWE-639](https://cwe.mitre.org/data/definitions/639.html)
- **Tags:** [Information disclosure](https://agentprime.io/advisories/tag/info-disclosure.md) · [Broken access control](https://agentprime.io/advisories/tag/access-control.md)
- **Published:** 6 Oct 2026
- **Updated:** 6 Oct 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 6 Oct 2026, 16:09 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `payload` (npm): affected `>=3.0.0, <3.90.0 || >=4.0.0-canary.0, <4.0.0-canary.34`; fixed in `3.90.0`, `4.0.0-canary.34`

## Machine-written summary

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

> The npm package payload, versions 3.0.0 up to but not including 3.90.0, and 4.0.0-canary.0 up to but not including 4.0.0-canary.34, is affected. A user with query access can use polymorphic join filters to infer hidden or read-restricted field values, including password-reset tokens. Users should upgrade to payload 3.90.0 or 4.0.0-canary.34 or later, since the source says restricting read access only reduces exposure and offers no complete workaround.

Written 31 Oct 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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0024, the 15th percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 13:34 UTC: First seen by agentprime
- 31 Oct 2026, 13:34 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-fpww-c55p-cjv6)

## Sources

- [GitHub Advisory Database: GHSA-fpww-c55p-cjv6](https://github.com/advisories/GHSA-fpww-c55p-cjv6)
- [OSV: GHSA-fpww-c55p-cjv6](https://osv.dev/vulnerability/GHSA-fpww-c55p-cjv6)
- <https://github.com/payloadcms/payload/security/advisories/GHSA-fpww-c55p-cjv6>
- <https://github.com/payloadcms/payload/commit/caa3f69b5aecc6e7c2b459ed87972cbca9f33ee5>
- <https://github.com/payloadcms/payload>
- <https://github.com/payloadcms/payload/releases/tag/v3.90.0>

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-fpww-c55p-cjv6>, 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-fpww-c55p-cjv6/>. Everything for agents: <https://agentprime.io/llms.txt>.