CVE-2026-42300

CRITICALNVD 9.39.3—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.3 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 83% 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, nvd
9.3
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.3Exploit: NoneExposed: 0

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

DevGuard provides vulnerability management for the full software supply chain. Prior to 1.2.2, the SessionMiddleware accepts a client-supplied X-Admin-Token HTTP request header and uses its raw string value as the authenticated userID when no Kratos session cookie is present. An unauthenticated attacker who knows or can guess a target user's Kratos identity UUID can issue requests as that user. Where the target user is an organisation admin or owner, this gives the attacker full control over that organisation's DevGuard resources. This vulnerability is fixed in 1.2.2.

CVSS v3
9.3
EG Score
9.3(medium)
EPSS
17.1%
KEV
Not listed

Published

May 12, 2026

Last Modified

May 13, 2026

Advisory Details (2)

Auto-updated May 12, 2026
Patch available. Sources: github.
github Patch Available

Unauthenticated identity assertion via `X-Admin-Token` header · Advisory · l3montree-dev/devguard · GitHub

https://github.com/l3montree-dev/devguard/security/advisories/GHSA-2g9v-7mr5-fgjg
generic

removes admin token implementation · l3montree-dev/devguard@6f38310 · GitHub

https://github.com/l3montree-dev/devguard/commit/6f38310bf93b2a63df3055038f4da82b1f4e6d9a

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFixed inDependents
github.com/l3montree-dev/devguard—1.2.2—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 63× 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 171 total refreshes for this CVE.

  1. 2026-07-12 05:46 UTCEPSS rescore
  2. 2026-07-11 08:27 UTCEPSS rescore
  3. 2026-07-09 19:10 UTCEPSS rescore
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  16. 2026-06-28 12:59 UTCEG score recompute
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  24. 2026-06-26 20:44 UTCEG score recompute
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  1. 2026-06-25 21:13 UTCEG score recompute
  2. 2026-06-25 13:49 UTCEPSS rescore
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  22. 2026-06-15 05:47 UTCEG score recompute
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  30. 2026-06-13 23:00 UTCEPSS rescore
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  34. 2026-06-12 23:12 UTCEPSS rescore
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  36. 2026-06-12 20:35 UTCEG score recompute
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  44. 2026-06-11 14:00 UTCEPSS rescore
  45. 2026-06-11 11:53 UTCEG score recompute
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  49. 2026-06-10 22:18 UTCEPSS rescore
  50. 2026-06-10 20:54 UTCEG score recompute
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  54. 2026-06-10 13:16 UTCEG score recompute
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  60. 2026-06-09 14:49 UTCEG score recompute
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  66. 2026-06-08 14:17 UTCEPSS rescore
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  68. 2026-06-08 14:08 UTCEG score recompute
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  73. 2026-06-07 19:31 UTCEG score recompute
  74. 2026-06-07 15:48 UTCEG score recompute
  75. 2026-06-07 15:25 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-42300?
CVE-2026-42300 is a critical vulnerability published on May 12, 2026. DevGuard provides vulnerability management for the full software supply chain. Prior to 1.2.2, the SessionMiddleware accepts a client-supplied X-Admin-Token HTTP request header and uses its raw string value as the authenticated userID when no Kratos session cookie is present. An unauthenticated…
When was CVE-2026-42300 disclosed?
CVE-2026-42300 was first published in the National Vulnerability Database on May 12, 2026, with the most recent update on May 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-42300 actively exploited?
CVE-2026-42300 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 17.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-42300?
CVE-2026-42300 has a CVSS v3 base score of 9.3 (NVD).
How do I remediate CVE-2026-42300?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42300, 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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