CVE-2025-68435

CRITICALNVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.1 under NVD CVSS v3. EPSS exploit probability: 0.1%, top 75% 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
9.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.1Exploit: NoneExposed: 0

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

Zerobyte is a backup automation tool Zerobyte versions prior to 0.18.5 and 0.19.0 contain an authentication bypass vulnerability where authentication middleware is not properly applied to API endpoints. This results in certain API endpoints being accessible without valid session credentials. This is dangerous for those who have exposed Zerobyte to be used outside of their internal network. A fix has been applied in both version 0.19.0 and 0.18.5. If immediate upgrade is not possible, restrict network access to the Zerobyte instance to trusted networks only using firewall rules or network segmentation. This is only a temporary mitigation; upgrading is strongly recommended.

CVSS v3
9.1
EG Score
9.1(medium)
EG Risk
—
EPSS
29.5%
KEV
Not listed

Published

December 17, 2025

Last Modified

March 5, 2026

Advisory Details (3)

Auto-updated Jul 21, 2026
Patch available. Sources: github_commit, github.
github Patch Available

Authentication Bypass by Primary Weakness in zerobyte · Advisory · nicotsx/zerobyte · GitHub

https://github.com/nicotsx/zerobyte/security/advisories/GHSA-x539-c98q-38gv
generic

API endpoints are accessible without authentication · Issue #161 · nicotsx/zerobyte · GitHub

https://github.com/nicotsx/zerobyte/issues/161
github_commit Patch Available

commit 13e080a18967 (nicotsx/zerobyte)

Patch available: nicotsx/zerobyte v0.25.1 (contains commit 13e080a18967)

https://github.com/nicotsx/zerobyte/commit/13e080a18967705bd2b4e110e5f7693fdca1c692

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 45× 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.

  1. 2026-07-22 14:08 UTCEPSS rescore
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  25. 2026-07-06 07:32 UTCOSV refresh
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  1. 2026-07-06 02:23 UTCEPSS rescore
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  29. 2026-06-18 17:52 UTCEPSS rescore
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  31. 2026-06-17 19:05 UTCOSV refresh
  32. 2026-06-17 17:53 UTCEPSS rescore
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  45. 2026-06-07 15:24 UTCEPSS rescore
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  62. 2026-05-29 17:21 UTCEG score recompute
  63. 2026-05-29 16:20 UTCOSV refresh
  64. 2026-05-29 13:44 UTCEPSS rescore

Frequently asked(5)

What is CVE-2025-68435?
CVE-2025-68435 is a critical vulnerability published on December 17, 2025. Zerobyte is a backup automation tool Zerobyte versions prior to 0.18.5 and 0.19.0 contain an authentication bypass vulnerability where authentication middleware is not properly applied to API endpoints. This results in certain API endpoints being accessible without valid session credentials. This…
When was CVE-2025-68435 disclosed?
CVE-2025-68435 was first published in the National Vulnerability Database on December 17, 2025, with the most recent update on March 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-68435 actively exploited?
CVE-2025-68435 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 29.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2025-68435?
CVE-2025-68435 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2025-68435?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-68435, 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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