EUVD-2026-64149
GHSA-5h77-88j3-r659
Severity by source
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:N
Unauthenticated network poisoning with victim-triggered detonation (UI:R), scope change to YOURLS origin, high integrity from privileged same-origin actions, low confidentiality from token exposure only.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
Lifecycle Timeline
4DescriptionCVE.org
YOURLS is a self-hosted, customizable URL shortener written in PHP. From 1.5.1 until 1.10.4, YOURLS stores the HTTP Referer header through yourls_get_referrer(), yourls_sanitize_url_safe(), and yourls_log_redirect(), then aggregates the value in yourls-infos.php and passes the derived domain through yourls_get_domain(), yourls_stats_pie(), and yourls_google_array_to_data_table(). The chart builder concatenates labels into inline JavaScript without JavaScript-string escaping, so an unauthenticated attacker can poison the statistics of an existing short URL with a crafted referrer. When an administrator or public stats-page viewer opens the affected statistics page, attacker-controlled JavaScript executes in the YOURLS origin and can access admin-visible data, the API signature token, and privileged same-origin actions. This issue is fixed in version 1.10.4.
AnalysisAI
Stored XSS in YOURLS 1.5.1 through 1.10.3 enables unauthenticated attackers to inject arbitrary JavaScript into per-link statistics pages by sending a crafted HTTP Referer header to any existing short URL - no account or special access required for the poisoning step. When an administrator or public stats-page visitor subsequently opens the affected short URL's statistics page, attacker-controlled code executes in the YOURLS origin, granting access to the API signature token, admin-visible session data, and privileged same-origin actions. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attack has two phases with distinct conditions. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The provided CVSS 3.1 vector AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:N scoring 8.2 is accurate and well-calibrated. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: 1.10.4. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Immediate (24 hours): Inventory all YOURLS deployments and identify those running versions 1.5.1-1.10.3; restrict public access to statistics pages as interim protection. …
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External POC / Exploit Code
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