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CVE-2026-18353— Unauthenticated SSRF in PIA via OIDC issuer allowlist bypass

Quick assessment

Affected
Eclipse Foundation Eclipse CSI - PIA
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Eclipse Project Identity Authority是美国Eclipse基金会的一款身份认证与权限管理产品。 Eclipse Project Identity Authority 0.4.0版本至0.6.0之前版本存在服务端请求伪造漏洞，该漏洞源于在OIDC发现过程中，使用Python的urlparse和requests/urllib3解析权威字符串时对反斜杠处理不一致，导致攻击者可绕过发行者白名单检查，实施服务端请求伪造，连接攻击者控制的主机。

CVSS 8.8 · High EPSS 0.41% · P33

Affected Version Matrix 1

VendorProduct Version RangeStatus
Eclipse Foundation Eclipse CSI - PIA 0.4.0< 0.6.0 affected
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I. Basic Information for CVE-2026-18353

Vulnerability Information
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Vulnerability Title
Unauthenticated SSRF in PIA via OIDC issuer allowlist bypass
Source: CVE Program / CVE List V5
Vulnerability Description
PIA's `POST /v1/upload/sbom` endpoint accepts a Bearer JWT and checks its **unverified** `iss` claim against an issuer allowlist using Python's `urlparse` before performing OIDC discovery with `requests`. Because `urlparse` and `requests`/`urllib3` parse an authority string containing a backslash (e.g. `https://attacker-host\@ci.eclipse.org/`) into *different* hostnames, an attacker can craft an issuer that passes the allowlist check yet drives `requests` — and subsequently `urllib.request.urlopen` for JWKS retrieval — to connect to an arbitrary attacker-chosen host, port, and scheme.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
Eclipse Project Identity Authority 服务端请求伪造漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Eclipse Project Identity Authority是美国Eclipse基金会的一款身份认证与权限管理产品。 Eclipse Project Identity Authority 0.4.0版本至0.6.0之前版本存在服务端请求伪造漏洞，该漏洞源于在OIDC发现过程中，使用Python的urlparse和requests/urllib3解析权威字符串时对反斜杠处理不一致，导致攻击者可绕过发行者白名单检查，实施服务端请求伪造，连接攻击者控制的主机。
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
Eclipse Foundation Eclipse CSI - PIA 0.4.0 ~ 0.6.0 -

II. Public POCs for CVE-2026-18353

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 10656 chars
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III. Intelligence Information for CVE-2026-18353

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Vendor Advisories for CVE-2026-18353 (1)

IV. Related Vulnerabilities

Same product: Eclipse CSI - PIA
Same vendor: Eclipse Foundation
Same weakness: CWE-918

V. Comments for CVE-2026-18353

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