CVE-2026-21529
published 2026-02-10CVE-2026-21529: Improper neutralization of input during web page generation ('cross-site scripting') in Azure HDInsights allows an authorized attacker to perform spoofing over…
PriorityP428medium5.4CVSS 3.1
AVNACLPRLUIRSCCLILAN
EPSS
0.62%
47.5th percentile
Improper neutralization of input during web page generation ('cross-site scripting') in Azure HDInsights allows an authorized attacker to perform spoofing over a network.
Affected
3 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| microsoft | azure_hdinsight | < 5.1 | 5.1 |
| microsoft | azure_hdinsight | >= 1.0 < 5.1 | 5.1 |
| msrc | azure_hdinsight | — | — |
CVSS provenance
nvdv3.15.4MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
cisa8.8HIGH
vendor_msrc5.7MEDIUM
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GHSA
GHSA-8754-7pfj-x7mr: Improper neutralization of input during web page generation ('cross-site scripting') in Azure HDInsights allows an authorized attacker to perform spoo
ghsa_unreviewed·2026-02-10
CVE-2026-21529 [MEDIUM] CWE-79 GHSA-8754-7pfj-x7mr: Improper neutralization of input during web page generation ('cross-site scripting') in Azure HDInsights allows an authorized attacker to perform spoo
Improper neutralization of input during web page generation ('cross-site scripting') in Azure HDInsights allows an authorized attacker to perform spoofing over a network.
CISA
Microsoft Exchange Server Deserialization of Untrusted Data Vulnerability
cisa·2026-04-13·CVSS 8.8
CVE-2023-21529 [HIGH] CWE-502 Microsoft Exchange Server Deserialization of Untrusted Data Vulnerability
Vulnerability: Microsoft Exchange Server Deserialization of Untrusted Data Vulnerability
Affected: Microsoft Exchange Server
Microsoft Exchange Server contains a deserialization of untrusted data that allows an authenticated attacker to achieve remote code execution.
Required Action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Notes: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21529 ; https://nvd.nist.gov/vuln/detail/CVE-2023-21529
Remediation Due Date: 2026-04-27
Microsoft
Azure HDInsight Spoofing Vulnerability
vendor_msrc·2026-02-10·CVSS 5.7
CVE-2026-21529 [MEDIUM] CWE-79 Azure HDInsight Spoofing Vulnerability
Azure HDInsight Spoofing Vulnerability
Description: Improper neutralization of input during web page generation ('cross-site scripting') in Azure HDInsights allows an authorized attacker to perform spoofing over a network.
FAQ: According to the CVSS metric, user interaction is required (UI:R) and privileges required is Low (PR:L). What does that mean for this vulnerability?
An authorized attacker with privileges could send controlled inputs to exploit this vulnerability.
FAQ: What additional customer action is needed to be protected?
The customer action needed is to restart Ambari server in both of the head nodes to have this fix updated.
Azure HDInsights: Azure HDInsights
Microsoft: Microsoft
Customer Action Required: Yes
Impact: Spoofing
Exploit Status: Publicly Disclosed:No;Expl
No detection rules found.
No public exploits indexed.
Sophos
February’s Patch Tuesday assumes battle stations
blogs_sophos·2026-02-13
February’s Patch Tuesday assumes battle stations
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Bleepingcomputer
Microsoft February 2026 Patch Tuesday fixes 6 zero-days, 58 flaws
blogs_bleepingcomputer·2026-02-10·CVSS 8.8
[HIGH] Microsoft February 2026 Patch Tuesday fixes 6 zero-days, 58 flaws
## Microsoft February 2026 Patch Tuesday fixes 6 zero-days, 58 flaws
## Lawrence Abrams
25 Elevation of Privilege vulnerabilities
5 Security Feature Bypass vulnerabilities
12 Remote Code Execution vulnerabilities
6 Information Disclosure vulnerabilities
3 Denial of Service vulnerabilities
7 Spoofing vulnerabilities
When BleepingComputer reports on Patch Tuesday security updates, we only count those released by Microsoft today. Therefore, the number of flaws does not include 3 Microsoft Edge flaws fixed earlier this month.
As part of these updates, Microsoft has also begun to roll out updated Secure Boot certificates to replace the original 2011 certificates that are expiring in late June 2026.
"With this update, Windows quality updates include a broad set of targeting data that i
Sophos
February’s Patch Tuesday assumes battle stations
blogs_sophos
February’s Patch Tuesday assumes battle stations
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Microsoft on Tuesday released 58 patches affecting 15 product families. Five of the addressed issues, all involving Azure, are considered by Microsoft to be of Critical severity, though only two require urgent attention (more on that below). Fifteen have a CVSS base score of 8.0 or higher, including two with a 9.8 base score. Six are known to be under active exploit in the wild, and three are publicly disclosed (including one not yet known to be under exploit).
At patch time, five CVEs are judged more likely to be exploited in the next 30 days by the company’s estimation, in addition to the six already detected to be so. Various of this month’s issues are amenable to direct detection by Sophos protections, and we include information on those in a table below. The release also
2026-02-10
Published