Security readout for executives and security teams
Plain-English summary
CVE-2026-25802 affects QuantumNous New API, an LLM gateway and AI asset management system. Before 0.10.8-alpha.9, its MarkdownRenderer component may render unsafe model output as script-capable content, creating cross-site scripting risk. This could let a low-privileged user influence content that another user views, affecting application integrity and availability.
Executive priority
Prioritize remediation for internet-facing or shared New API deployments. The issue is high severity, has a published fix, and could let lower-privileged users affect what other users’ browsers execute or display. There is no cited evidence of active exploitation in the provided sources.
Technical view
The issue is CWE-79 XSS in MarkdownRenderer.jsx. The advisory states unsafe handling of model outputs containing a script tag before version 0.10.8-alpha.9. CVSS 3.1 is 7.6: network reachable, low complexity, low privileges required, user interaction required, scope changed, high integrity impact, low availability impact.
Likely exposure
Organizations running QuantumNous new-api versions earlier than 0.10.8-alpha.9 are potentially exposed, especially where untrusted or user-influenced model output is displayed in the web UI. Exposure depends on deployment, authentication, and who can generate content viewed by other users.
Exploitation context
No CISA KEV listing or source-provided active exploitation evidence is included. The described attack path requires low privileges and user interaction: malicious or unsafe model-rendered content must be viewed by a user. The impact is primarily browser-side integrity compromise within the application context.
Researcher notes
Key unknowns include real-world exploitability across configurations and whether sanitization exists elsewhere in the rendering path. Analysis should focus on version confirmation, the MarkdownRenderer.jsx change, trust boundaries around model output, and whether untrusted users can cause other users to view generated markdown.
Mitigation direction
- Upgrade QuantumNous new-api to version 0.10.8-alpha.9 or later.
- Review the GitHub advisory and fixing commit for vendor-specific remediation details.
- Restrict access to affected interfaces until upgraded if untrusted users can generate displayed content.
- Monitor vendor channels for any additional guidance or backported fixes.
Validation and detection
- Inventory all QuantumNous new-api deployments and record their versions.
- Flag any instance running a version earlier than 0.10.8-alpha.9.
- Confirm MarkdownRenderer.jsx includes the vendor fix from commit ab5456e.
- Review logs and reports for suspicious rendered-content behavior.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-79: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-25802 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 7.6 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:L
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:L2.34.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.6HighVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:L
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/QuantumNous/new-api/security/advisories/GHSA-299v-8pq9-5gjqCVE reference · x_refsource_CONFIRM
- https://github.com/QuantumNous/new-api/commit/ab5456eb1049aa8a0f3e51f359907ec7fff38b4bCVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.