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CVE-2026-44903— Prometheus: Stored XSS via crafted histogram bucket label values in the heatmap display of the old Prometheus web UI

Quick assessment

Affected
prometheus prometheus
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

AI Predicted 6.1 Difficulty: Easy EPSS 0.24% · P14

Affected Version Matrix 2

VendorProduct Version RangeStatus
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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Source: CVE Program / CVE List V5
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: CVE Program / CVE List V5
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

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III. Intelligence Information for CVE-2026-44903

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Patches & Fixes for CVE-2026-44903 (1)

Vendor Advisories for CVE-2026-44903 (1)

IV. Related Vulnerabilities

Same product: prometheus
Same vendor: prometheus
Same weakness: CWE-79

V. Comments for CVE-2026-44903

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