Loading vulnerability…
CVE-2026-63135 is a stored cross-site scripting vulnerability in YOURLS, a self-hosted PHP URL shortener, affecting versions 1.5.1 through 1.10.3. The flaw arises from unsafe handling of the HTTP Referer header in the redirect logging and statistics pipeline. YOURLS stores attacker-controlled referrer data via functions including yourls_get_referrer(), yourls_sanitize_url_safe(), and yourls_log_redirect(), later derives a domain value during statistics generation, and embeds that value into inline JavaScript used to render referrer charts through functions including yourls_get_domain(), yourls_stats_pie(), and yourls_google_array_to_data_table(). Because the chart-building logic concatenates labels into JavaScript without proper JavaScript-string escaping, an unauthenticated attacker can poison the stored statistics for an existing short URL with crafted referrer input. When an administrator or a viewer of a public statistics page opens the affected statistics view, attacker-supplied JavaScript executes in the YOURLS origin.
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A stored cross-site scripting vulnerability in YOURLS where a crafted HTTP Referer header can poison referrer statistics and trigger attacker-controlled JavaScript when an administrator or public stats-page viewer opens the affected statistics page.
A stored XSS vulnerability in YOURLS where a crafted HTTP Referer header is logged and later rendered unsafely in the statistics visualization page, enabling unauthenticated attackers to execute JavaScript in an administrator's browser session.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.