CVE-2026-44903— Prometheus: Stored XSS via crafted histogram bucket label values in the heatmap display of the old Prometheus web UI
Possible ATT&CK Techniques 2AI
T1189 · Drive-by Compromise T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 2
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| prometheus | prometheus | >= 2.49.0, < 3.5.3 | affected |
>= 3.6.0-rc.0, < 3.11.3 | affected |
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I. Basic Information for CVE-2026-44903
Vulnerability Information
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Vulnerability Title
Prometheus: Stored XSS via crafted histogram bucket label values in the heatmap display of the old Prometheus web UI
Source: NVD (National Vulnerability Database)
Vulnerability Description
Prometheus is an open-source monitoring system and time series database. From 2.49.0 to before 3.5.3 and 3.11.3, in the Prometheus server's legacy web UI (enabled via the command-line flag --enable-feature=old-ui), the histogram heatmap chart view does not escape le label values when inserting them into the HTML for use as axis tick mark labels. An attacker who can inject crafted metrics can execute JavaScript in the browser of any Prometheus user who views the metric in the heatmap chart UI. This vulnerability is fixed in 3.5.3 and 3.11.3.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Prometheus 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Prometheus是Prometheus开源的一款使用Go语言编写的、用于记录使用HTTP拉模型构建的时间序列数据库中实时指标的开源软件。 Prometheus 2.49.0版本至3.5.3之前版本和3.11.3之前版本存在跨站脚本漏洞，该漏洞源于旧版Web UI中直方图热力图图表视图未对le标签值进行转义，攻击者可通过注入特制指标在查看热力图用户的浏览器中执行JavaScript。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| prometheus | prometheus | >= 2.49.0, < 3.5.3 | - |
II. Public POCs for CVE-2026-44903
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-44903 (1)
Vendor Advisories for CVE-2026-44903 (1)
IV. Related Vulnerabilities
Same product: prometheus
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Prometheus: remote read endpoint allows denial of service vi - CVE-2026-42151
Prometheus Azure AD remote write OAuth client secret exposed - CVE-2026-40179
Prometheus: Stored XSS via metric names and label values in - CVE-2021-29622
Arbitrary redirects under /new endpoint - CVE-2019-3826
Prometheus 跨站脚本漏洞
Same vendor: prometheus
- CVE-2026-42154
Prometheus: remote read endpoint allows denial of service vi - CVE-2026-42151
Prometheus Azure AD remote write OAuth client secret exposed - CVE-2026-40179
Prometheus: Stored XSS via metric names and label values in - CVE-2023-40577
Alertmanager UI is vulnerable to stored XSS via the /api/v1/ - CVE-2022-46146
Prometheus Exporter Toolkit vulnerable to basic authenticati
Same weakness: CWE-79
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Shariff Wrapper <= 4.6.20 - Authenticated (Contributor+) Cro - CVE-2024-47097
Reflected Cross-Site Scripting in Follet School Solutions De - CVE-2024-47096
Reflected Cross-Site Scripting in Follet School Solutions De - CVE-2026-7052
HT Contact Form <= 2.8.2 - Unauthenticated Stored Cross-Site - CVE-2026-7660
Easy Updates Manager <= 9.0.20 - Reflected Cross-Site Script
V. Comments for CVE-2026-44903
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