CVE-2026-46386

CRITICALPre-NVD 9.99.9—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.9 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 81% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
9.9
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.9Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

OpenProject is open-source, web-based project management software. Prior to , the official openproject/openproject Docker image ships ENV SECRET_KEY_BASE=OVERWRITE_ME as the default Rails master key. Combined with cookies_serializer = :marshal, this gives any logged-in user a deterministic Marshal-deserialization path reachable via the /my/two_factor_devices cookie reader This vulnerability is fixed in .

CVSS v3
9.9
EG Score
9.9(medium)
EPSS
19.1%
KEV
Not listed

Published

June 26, 2026

Last Modified

June 29, 2026

Advisory Details (1)

Auto-updated Jul 7, 2026
Patch available. Sources: github.
github Patch Available

Pre-authentication RCE in openproject/openproject Docker image via default `SECRET_KEY_BASE=OVERWRITE_ME` and `cookies_serializer = :marshal` · Advisory · opf/openproject · GitHub

https://github.com/opf/openproject/security/advisories/GHSA-r85r-gjq2-f83r

Weakness Classification(4)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 51× in last 7d / 111× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 111 total refreshes for this CVE.

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Frequently asked(5)

What is CVE-2026-46386?
CVE-2026-46386 is a critical vulnerability published on June 26, 2026. OpenProject is open-source, web-based project management software. Prior to , the official openproject/openproject Docker image ships ENV SECRETKEYBASE=OVERWRITEME as the default Rails master key. Combined with cookiesserializer = :marshal, this gives any logged-in user a deterministic…
When was CVE-2026-46386 disclosed?
CVE-2026-46386 was first published in the National Vulnerability Database on June 26, 2026, with the most recent update on June 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-46386 actively exploited?
CVE-2026-46386 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 19.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-46386?
CVE-2026-46386 has a CVSS v3 base score of 9.9 (NVD).
How do I remediate CVE-2026-46386?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-46386, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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