Stored cross-site scripting in blob42 gosuki web interface
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-79.
Summary
blob42 gosuki through commit 6e2bf34 has a stored cross-site scripting flaw (CWE-79). The web interface uses text/template instead of html/template, so the URL and DisplayURL fields of bookmarks are not escaped for the HTML context. An attacker with low privileges can save a bookmark URL containing HTML that breaks out of an attribute and runs JavaScript in the browser of a user who views it in the local web interface, which requires user interaction.
Written with Claude Haiku 5.5 from the sources below · 2026-10-28
Description from the CNA
blob42 gosuki through commit 6e2bf34 contains a Stored Cross-Site Scripting (XSS) vulnerability. The application uses text/template instead of html/template, failing to perform context-aware auto-escaping on the URL and DisplayURL fields of bookmarks in internal/webui/templates/bookmarks.html. An attacker can craft a malicious bookmark URL containing HTML attribute-breaking payloads that execute arbitrary JavaScript in the victim's browser context when rendered in the local web interface.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
Remediation
The sources list no fixed version for blob42 gosuki.
Written with Claude Haiku 5.5 from the sources below · 2026-10-28
Timeline
- 2026-10-13 Threatist record created from CVE-2026-104587
- 2026-10-13 Alias added: GHSA-vfxj-r6f4-qcvw
- 2026-10-16 CVSS score added · CISA ADP
- 2026-10-16 Weakness changed · CISA ADP
- 2026-10-16 CISA SSVC decision points changed
- 2026-10-16 Priority changed: LOW → MEDIUM
Sources
- CVE-2026-104587 · CVE Program
- CVE-2026-104587 · NVD
- FIRST EPSS
- GHSA-vfxj-r6f4-qcvw · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences