Apache CloudStack: Cross-Site Scripting (XSS) Vulnerability in Instance Reset Password Function in UI
Published Aug 21, 2026
9.1
CRITICALCVSS 3.1
EPSS 0.57%
Description
Improper Encoding or Escaping of Output vulnerability in Apache CloudStack's UI while using Instance Reset Password functionality.
This issue affects Apache CloudStack: from 4.15.1.0 through 4.20.3.0 and from 4.21.0.0 through 4.22.1.0.
Users are recommended to upgrade to version 4.20.3.1 or 4.22.1.1 or later, which fixes the issue.
Affected products
-
- Version 4.15.1.0StatusaffectedConstraints<=4.20.3.0
- Version 4.21.0.0StatusaffectedConstraints<=4.22.1.0
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Apache Software Foundation | Apache CloudStack | unaffected |
|
- ≥ 4.15.1.0 · < 4.20.3.1
- ≥ 4.21.0.0 · < 4.22.1.1
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
YesTechnical Impact
TotalDecision
n/aAssessed Aug 25, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
Aug–Oct 2026- EPSS v5
Percentile over time
- EPSS v5
Table of values (2 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.57% (0.00568) | 45.05th | v5 (v2026.06.15) |
| Aug 21, 2026 | 0.14% (0.00139) | 3.78th | v5 (v2026.06.15) |
References (1)
- https://lists.apache.org/thread/g6cwddtjrwbh1d56wjz4cfp3fzfm4kbc vendor-advisoryVendor AdvisoryMailing List
| Link | Providers | Tags |
|---|---|---|
| https://lists.apache.org/thread/g6cwddtjrwbh1d56wjz4cfp3fzfm4kbc | vendor-advisoryVendor AdvisoryMailing List |
Change history (0)
No recorded changes yet.