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Not in CISA KEV
MEDIUM severity

CVE-2018-20301 — coherence

MEDIUM

CVE-2018-20301 is a medium-severity (CVSS 6.5) Improper Input Validation vulnerability in coherence. A fix is available for coherence — see the affected versions and patch details below.

Permissive parameters and privilege escalation

Also known asGHSA-mrq8-53r4-3j5m
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Oct 7, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.9%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs58th percentile — riskier than 58% of all scored CVEsHighest risk
0.00%0.47%0.93%1.40%0.2%0.9%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2018-20301 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,738 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected
💧coherence

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Hex packages — download data is not available via public APIs for these ecosystems.

Description

An issue was discovered in Steve Pallen Coherence before 0.5.2 that is similar to a Mass Assignment vulnerability. In particular, "registration" endpoints (e.g., creating, editing, updating) allow users to update any coherence_fields data. For example, users can automatically confirm their accounts by sending the confirmed_at parameter with their registration request.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
💧Hexcoherenceall versions0.5.2mix deps.update coherence

Affected Products

1 product · 1 configurations
Application
coherencecoherence_project
< 0.5.2
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for coherence, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update coherence to 0.5.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2018-20301 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

An issue was discovered in Steve Pallen Coherence before 0.5.2 that is similar to a Mass Assignment vulnerability. In particular, "registration" endpoints (e.g., creating, editing, updating) allow users to update any coherence_fields data. For example, users can automatically confirm their accounts by sending the confirmed_at parameter with their registration request.
O3 Security · Impact-Aware SCA

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CVE-2018-20301: coherence — Fixed in 0.5.2