Authenticated Server-Side Request Forgery (SSRF) via feed URL in Stringer (CVE-2026-55160) | HOL Guard CVE

High · CVSS 7.6CVE-2026-55160

Authenticated Server-Side Request Forgery (SSRF) via feed URL in Stringer

Answer in brief

CVE-2026-55160 records a High severity (CVSS 7.6) vulnerability in Authenticated Server-Side Request Forgery (SSRF) via feed URL in Stringer. The current sources do not mark it as known exploited. The current feed maps stringer-rss/stringer (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 28, 2026Updated Sep 28, 2026Source checked Sep 28, 2026First seen by HOL Sep 28, 2026Material review Sep 28, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.6
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 7.6. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps stringer-rss/stringer (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
stringer-rss/stringergeneric	<75cb0955919a362ac49d23c8a14892d0f59ea1c4	75cb0955919a362ac49d23c8a14892d0f59ea1c4

Recommended response

Check inventory. Check lockfiles and deployed manifests for stringer-rss/stringer.
Review the reported fix. Update stringer-rss/stringer to 75cb0955919a362ac49d23c8a14892d0f59ea1c4 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 28, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 28, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 28, 2026

Sources and claim methodology

Upstream source description

Stringer is a self-hosted, anti-social RSS reader. Prior to commit 75cb095, an unrestricted Server-Side Request Forgery (SSRF) vulnerability allows any authenticated user to force the Stringer server to send arbitrary HTTP/HTTPS requests to internal networks, localhost services, and cloud metadata endpoints (e.g. AWS IMDS 169.254.169.254). When self-service signup is enabled (Setting::UserSignup), even a low-privileged registered user can exploit this to scan internal services or steal cloud IAM credentials. This issue has been patched via commit 75cb095.

Quoted source text, attributed separately from HOL analysis.