Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain
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AccessCraft malicious reflected-XSS URL
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DeliveryDeliver URL to authenticated RT user via phishing
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ExploitVictim clicks crafted link
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ExecutionBrowser reflects unsanitized parameter as script
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PersistArbitrary JavaScript executes in victim RT session
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ImpactSteal session token or perform in-session actions
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V1 - Encoding and Sanitization Output encoding, context-aware escaping
MITRE ATT&CK
2 techniques across 2 tactics: Initial Access, Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Exploitation Conditions | The victim must be an authenticated RT user with an active browser session at the time of exploitation - the CVSS PR:N metric reflects that the attacker requires no credentials of their own, not that the victim is unauthenticated. UI:R confirms that victim interaction (clicking or otherwise loading the crafted URL) is mandatory; the attack cannot proceed without this step. No special RT configuration, enabled features, or non-default deployment modes are described as prerequisites - the vulnerability affects the standard RT web interface across all affected versions. Exploitation is inherently limited by the requirement to socially engineer a specific class of user (active, authenticated RT operators), which prevents automated or opportunistic mass scanning exploitation. Deployments that restrict RT access to internal networks or VPN further raise the bar by limiting who can deliver the crafted URL. |
| Impact | The CVSS 6.1 score reflects a network-accessible (AV:N), low-complexity (AC:L) attack that requires no attacker privileges (PR:N) but mandates victim user interaction (UI:R). The Scope Changed (S:C) metric elevates the score above a typical Moderate-rated XSS, acknowledging browser context impact. No EPSS data was provided in source intelligence, so exploitation probability cannot be quantified from that signal. RT is not listed in the CISA KEV catalog, and no public proof-of-concept code has been identified - these are meaningful limiting signals. The practical risk is moderate: while an attacker can craft the malicious URL trivially and needs no credentials, successful exploitation requires a phishing or social engineering step to deliver the URL to an authenticated RT user. This reduces automatable and opportunistic mass exploitation risk significantly. The attack is not remotely exploitable without the victim's active participation. Organizations running internal-only RT deployments behind VPNs or access controls face materially lower exposure than those with internet-facing RT instances. |
| Exploit ScenarioDerived | An attacker identifies a parameter in the RT web interface that is reflected unsanitized in the HTTP response, then constructs a URL embedding a JavaScript payload (e.g., a cookie-stealing script targeting the RT session token). The attacker delivers this URL to an RT user with an active authenticated session via a phishing email, internal chat message, or malicious redirect. When the victim clicks the link, their browser executes the injected script within the RT origin, potentially exfiltrating session cookies or performing privileged ticket operations on the victim's behalf. No public proof-of-concept code has been identified at time of analysis. |
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Alert meAnalysisAIv1 – Jul 20, 2026
Reflected Cross-Site Scripting in Best Practical RT versions 5.0.4-5.0.9 and 6.0.0-6.0.2 allows an unauthenticated attacker to execute arbitrary JavaScript in the browser session of an authenticated RT user by inducing that user to visit a specially crafted URL. The CVSS vector's Changed scope (S:C) indicates the injected script can impact browser security context beyond the vulnerable RT component itself, including potential session hijacking or in-browser data exfiltration. Vendor-released patches are confirmed in versions 5.0.10 and 6.0.3 (released 2026-05-20); no active exploitation has been identified at time of analysis.
RemediationAI
Upgrade to RT 5.0.10 or RT 6.0.3, both confirmed to contain the fix per vendor release notes dated 2026-05-20. The RT 6.0.3 tarball is available at https://download.bestpractical.com/pub/rt/release/rt-6.0.3.tar.gz with SHA-256 117b53e7a46e82ade662050d98920f1255865ca873d6bec80036085b17dd3dc6. Note that RT 6.0.3 users should additionally apply the manual patch at https://github.com/bestpractical/rt/commit/525547751b76cc422015960bae3056f4e8d4351f.patch for the separately tracked TSV export header injection (CVE-2026-41073), which was inadvertently omitted from 6.0.3 and will be included in 6.0.4. If immediate patching is not feasible, restrict the RT web interface to internal networks or VPN-only access to eliminate the most common delivery vector for crafted URLs; this does not eliminate risk from insider threats but significantly reduces external attack surface. User awareness training to avoid clicking unsolicited links to RT pages provides a secondary control layer, though it should not be relied upon as a primary mitigation.
Affected VersionsENISA
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 2 packages in euvd
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
CWE-79 (Improper Neutralization of Input During Web Page Generation) identifies the root cause: the RT web application reflects attacker-controlled input in HTTP responses without adequate sanitization or encoding, enabling the browser to interpret that input as executable script. RT is a Perl-based, enterprise-grade issue tracking system developed by Best Practical Solutions, identified by CPE cpe:2.3:a:bestpractical:rt:*:*:*:*:*:*:*:*. The CVSS Scope:Changed metric is particularly significant for XSS - it indicates the malicious script escapes the application's security boundary and operates within the victim's browser context, which is treated as a separate security authority. This class of vulnerability commonly arises in web applications that include request parameters (URL query strings, path segments, or headers) directly in rendered HTML responses without encoding special characters such as angle brackets and quotes.
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Severity by source
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Network-delivered reflected XSS; attacker needs no credentials (PR:N); victim must actively load crafted URL (UI:R); browser context escape justifies S:C; session-limited confidentiality and integrity impact (C:L/I:L); no availability impact.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
Lifecycle Timeline
1DescriptionCVE.org
RT is an open source, enterprise-grade issue and ticket tracking system. Versions 5.0.4 up to (but not including) 5.0.10, and 6.0.0 up to (but not including) 6.0.3 contain a reflected Cross-Site Scripting (XSS) vulnerability where an attacker who can induce an authenticated RT user to visit a crafted URL can execute arbitrary JavaScript in that user's browser session. This issue has been fixed in versions 5.0.10 and 6.0.3.
Threat Intelligence Overview
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Cross-Site Scripting occurs when an application accepts untrusted data and sends it to a web browser without proper validation or encoding.
Privilege escalation and information disclosure in Best Practical's Request Tracker (RT) 6.0.0-6.0.2 and versions before
Authenticated SQL injection in Best Practical's Request Tracker (RT) ticketing system affects versions 5.0.0-5.0.9 and 6
Authentication bypass in Best Practical's Request Tracker (RT) versions 5.0.9 and prior, and 6.0.0 through 6.0.2, allows
Cross-site request forgery in Best Practical Request Tracker (RT) versions 6.0.0 through 6.0.2 allows remote attackers t
Request Tracker (RT) 3.8.x before 3.8.17 and 4.0.x before 4.0.13 does not properly restrict access to private callback c
Cross-site request forgery (CSRF) vulnerability in Request Tracker (RT) 3.8.12 and other versions before 3.8.15, and 4.0
Reflected Cross-Site Scripting in RT (Request Tracker) 6.0.0 through 6.0.2 allows an unauthenticated network attacker to
Request Tracker (RT) 3.8.x before 3.8.17 and 4.0.x before 4.0.13 allows remote authenticated users with the permissions
Request Tracker (RT) 4.x before 4.0.13 does not properly enforce the DeleteTicket and "custom lifecycle transition" perm
Stored XSS in Best Practical RT (versions 5.0.0-5.0.9 and 6.0.0-6.0.2) allows any authenticated user with file upload pe
Stored Cross-Site Scripting in Best Practical RT versions 6.0.0 through 6.0.2 allows an authenticated attacker with writ
Algorithmic complexity vulnerability in Email::Address::List before 0.02, as used in RT 4.2.0 through 4.2.2, allows remo
EUVD-2026-46080
NVD
CVE.org
EPSS
Vulnrichment
GitHub
VulDB
Exploit-DB