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Advisory record · GHSA-wmj8-9953-vff5

OpenCost ServiceKey Endpoint Unauthorized Credential Overwrite/Injection

CVSS 8.8 HighEPSS 0.0075 · 55th percentile

Published by the GitHub Advisory Database at 14 Jul 2026, 17:07 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
github.com/opencost/opencostGo<1.119.11.119.1
Identifiers
GHSA-wmj8-9953-vff5 · CVE-2026-44300 · GO-2026-5974
Weakness (CWE)
CWE-20 · CWE-309
Tags
Published
14 Jul 2026
Updated
21 Jul 2026

Machine-written summary

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

OpenCost versions before 1.119.1 expose a /serviceKey endpoint that accepts POST requests without authentication and writes the submitted data over the GCP service account key file. A remote attacker who can reach the endpoint can replace the credentials, which can disrupt GCP cost data collection or redirect it to attacker-controlled credentials. Upgrade the Go module github.com/opencost/opencost to version 1.119.1 or later.

Written 6 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

ScoreRatingCVSSVectorSource
8.8 High 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0075, the 55th percentile, on 12 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:59 UTC First seen by agentprime
  2. 31 Oct 2026, 14:59 UTC Confirmed by OSV

Sources

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.