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CVE-2026-119566— Prometheus through 3.15.1 Credential Leak via remote_write Cross-Host Redirects

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 3.15.1 及更早版本存在凭证泄露漏洞，攻击者可通过将 请求重定向至其他主机，从而窃取 Azure AD 或 Google IAM 的承载令牌（Bearer Token）。若攻击者控制了 端点或重定向服务器，可返回 3xx 重定向响应，进而重放该令牌（例如用于向受害者的后端写入指标数据）。

CVSS 4.8 · Medium
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I. Basic Information for CVE-2026-119566

Vulnerability Information
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Vulnerability Title
Prometheus through 3.15.1 Credential Leak via remote_write Cross-Host Redirects
Source: CVE Program / CVE List V5
Vulnerability Description
Prometheus through 3.15.1 contains a credential leak vulnerability that allows attackers to capture Azure AD or Google IAM bearer tokens by redirecting remote_write requests to another host. Attackers controlling the remote-write endpoint or a redirecting server can return a 3xx to their host and replay the token, for example to write metrics to the victim's backend.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
不充分的凭证保护机制
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
prometheus prometheus 0 ~ 3.15.1 -

II. Public POCs for CVE-2026-119566

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III. Intelligence Information for CVE-2026-119566

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Patches & Fixes for CVE-2026-119566 (2)

Vendor Advisories for CVE-2026-119566 (1)

Security Blog Posts for CVE-2026-119566 (1)

Vendor Pages for CVE-2026-119566 (2)

IV. Related Vulnerabilities

Same product: prometheus
Same vendor: prometheus
Same weakness: CWE-522