CVE-2026-9780

HIGHPre-NVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-06-25. a secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
8.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 8.8Exploit: NoneExposed: 0

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

Quest NetVault Backup addclient3 Cross-Site Scripting Authentication Bypass Vulnerability. This vulnerability allows remote attackers to bypass authentication on affected installations of Quest NetVault Backup. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

The specific flaw exists within the addclient3 webpage. The issue results from the lack of proper validation of user-supplied data, which can lead to the injection of an arbitrary script. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of SYSTEM. Was ZDI-CAN-27666.

CVSS v3
8.8
EG Score
8.8(high)
EPSS
47.5%
KEV
Not listed

Published

June 25, 2026

Last Modified

June 26, 2026

Advisory Details (1)

Auto-updated Jun 25, 2026
No patch confirmed yet.
generic

ZDI-26-369 - TrendAI™ Zero Day Initiative™ (ZDI)

https://www.zerodayinitiative.com/advisories/ZDI-26-369/

Vendor Advisories for CVE-2026-9780(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 33× in last 7d / 58× 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. 2026-07-07 01:22 UTCEG score recompute
  2. 2026-07-07 01:22 UTCGHSA enrichment
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 12:16 UTCEG score recompute
  5. 2026-07-06 12:16 UTCGHSA enrichment
  6. 2026-07-06 02:23 UTCEPSS rescore
  7. 2026-07-05 23:10 UTCEG score recompute
  8. 2026-07-05 23:10 UTCGHSA enrichment
  9. 2026-07-05 09:58 UTCEG score recompute
  10. 2026-07-05 09:58 UTCGHSA enrichment
  11. 2026-07-05 02:31 UTCEPSS rescore
  12. 2026-07-04 20:52 UTCEG score recompute
  13. 2026-07-04 20:52 UTCGHSA enrichment
  14. 2026-07-04 07:47 UTCEG score recompute
  15. 2026-07-04 07:46 UTCGHSA enrichment
  16. 2026-07-04 06:31 UTCEPSS rescore
  17. 2026-07-03 18:41 UTCEG score recompute
  18. 2026-07-03 18:41 UTCGHSA enrichment
  19. 2026-07-03 05:35 UTCEG score recompute
  20. 2026-07-03 05:35 UTCGHSA enrichment
  21. 2026-07-02 17:02 UTCEPSS rescore
  22. 2026-07-02 16:26 UTCEG score recompute
  23. 2026-07-02 16:26 UTCGHSA enrichment
  24. 2026-07-02 03:18 UTCEG score recompute
  25. 2026-07-02 03:18 UTCGHSA enrichment
Show 33 more
  1. 2026-07-01 15:07 UTCEPSS rescore
  2. 2026-07-01 14:12 UTCEG score recompute
  3. 2026-07-01 14:12 UTCGHSA enrichment
  4. 2026-07-01 01:06 UTCEG score recompute
  5. 2026-07-01 01:06 UTCGHSA enrichment
  6. 2026-06-30 23:22 UTCEPSS rescore
  7. 2026-06-30 12:00 UTCEG score recompute
  8. 2026-06-30 12:00 UTCGHSA enrichment
  9. 2026-06-29 22:54 UTCEG score recompute
  10. 2026-06-29 22:54 UTCGHSA enrichment
  11. 2026-06-29 14:06 UTCEPSS rescore
  12. 2026-06-29 09:49 UTCEG score recompute
  13. 2026-06-29 09:49 UTCGHSA enrichment
  14. 2026-06-28 20:43 UTCEG score recompute
  15. 2026-06-28 20:43 UTCGHSA enrichment
  16. 2026-06-28 14:07 UTCEPSS rescore
  17. 2026-06-28 07:37 UTCEG score recompute
  18. 2026-06-28 07:37 UTCGHSA enrichment
  19. 2026-06-28 04:56 UTCEPSS rescore
  20. 2026-06-27 18:31 UTCEG score recompute
  21. 2026-06-27 18:31 UTCGHSA enrichment
  22. 2026-06-27 05:25 UTCEG score recompute
  23. 2026-06-27 05:25 UTCGHSA enrichment
  24. 2026-06-27 03:08 UTCEPSS rescore
  25. 2026-06-26 16:20 UTCEG score recompute
  26. 2026-06-26 16:20 UTCGHSA enrichment
  27. 2026-06-26 03:14 UTCEG score recompute
  28. 2026-06-26 03:14 UTCGHSA enrichment
  29. 2026-06-25 14:08 UTCEG score recompute
  30. 2026-06-25 14:08 UTCGHSA enrichment
  31. 2026-06-25 13:50 UTCEPSS rescore
  32. 2026-06-25 01:02 UTCEG score recompute
  33. 2026-06-25 01:02 UTCGHSA enrichment

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-9780?
CVE-2026-9780 is a high vulnerability published on June 25, 2026. Quest NetVault Backup addclient3 Cross-Site Scripting Authentication Bypass Vulnerability. This vulnerability allows remote attackers to bypass authentication on affected installations of Quest NetVault Backup. User interaction is required to exploit this vulnerability in that the target must visit…
When was CVE-2026-9780 disclosed?
CVE-2026-9780 was first published in the National Vulnerability Database on June 25, 2026, with the most recent update on June 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-9780 actively exploited?
CVE-2026-9780 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 47.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-9780?
CVE-2026-9780 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-9780?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-9780, 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.

Dependency Blast Radius

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