Postbird 0.8.4 allows stored XSS via the onerror attribute of an IMG element in any…
Priority LOW 31CWE-79Published · Updated
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 · NVD. Fix status from CNA. Impact type from CWE-79.
Summary
Postbird 0.8.4 allows stored XSS via the onerror attribute of an IMG element in any PostgreSQL database table. This can result in reading local files via vectors involving XMLHttpRequest and open of a file:/// URL, or discovering PostgreSQL passwords via vectors involving Window.localStorage and savedConnections.
Why it matters now
EPSS 0.03561 89th percentileScored 2026-11-07
Public exploit Yes 3 exploit referencesTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
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
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:postbird_project:postbird:0.8.4:*:*:*:*:*:*:* | 0.8.4 | Vulnerable | Postbird Project |
- cpe:2.3:a:postbird_project:postbird:0.8.4:*:*:*:*:*:*:* Versions 0.8.4 Vulnerable ·Postbird Project
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-33570
- 2026-10-03 Alias added: GHSA-38qm-8h84-7h9v
References
Exploit 3
Sources
- CVE-2021-33570 · CVE Program
- CVE-2021-33570 · NVD
- FIRST EPSS
- GHSA-38qm-8h84-7h9v · 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