EUVD-2026-43754
GHSA-ffr2-xp93-qf4x
Severity by source
AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
PR:L required for ticket submission; S:C because XSS executes in the privileged Agent/Admin browser context; A:N as availability is unaffected.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Lifecycle Timeline
4DescriptionCVE.org
osTicket versions from 1.10 up to 1.17.7 and from 1.18.0 up to 1.18.3 are vulnerable to a stored XSS due to a vulnerable Bootstrap Tooltip component and insufficient HTML sanitization, allowing remote attackers to execute arbitrary JavaScript in Agent or Admin sessions.
AnalysisAI
Stored XSS in osTicket's Agent and Admin panel allows any authenticated user with ticket-submission privileges to inject persistent JavaScript that executes in privileged staff browser sessions. Affected versions span two release branches: 1.10 through 1.17.7 and 1.18.0 through 1.18.3. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid osTicket user account with at least ticket-submission privileges (confirmed by PR:L in the CVSS vector). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 5.4 (Medium) with vector AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N accurately characterizes the attack conditions: a low-privileged authenticated account is required (PR:L), and a victim Agent or Admin must open the malicious content (UI:R). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with a valid low-privileged osTicket account submits a support ticket containing a crafted payload that abuses the data-original-title attribute - for example, a span element whose tooltip attribute contains an img tag with an onerror handler - which passes the pre-patch server-side sanitization because data-* attributes were not denied. When an Agent or Admin opens the ticket in the staff control panel, Bootstrap Tooltip v3.3.4 renders the unsanitized HTML, executing the attacker's JavaScript in the privileged session and enabling session cookie theft or unauthorized admin actions. … |
| Remediation | Upgrade to osTicket v1.17.8 (for deployments on the 1.17.x branch) or v1.18.4 (for deployments on the 1.18.x branch); both releases are available at https://github.com/osTicket/osTicket/releases. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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