JSM Show Post Metadata < 4.9.1 - Contributor+ Stored XSS via Custom Field Meta Key
Priority LOW 32CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- High
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-79.
Summary
The JSM Show Post Metadata WordPress plugin before 4.9.1 does not properly escape a post meta key before outputting it into an inline event-handler attribute in an admin-facing meta box, allowing users with contributor-level access and above to inject arbitrary JavaScript that executes in the session of a higher-privileged user who reviews the affected post.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00431 37th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Fixed JSM Show Post Metadata (Unknown): 4.9.1
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
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 |
|---|---|---|---|---|---|
| Unknown | JSM Show Post Metadata | before 4.9.1 | 4.9.1 | Patch available | CNA |
- JSM Show Post Metadata VendorUnknown Affected before 4.9.1 Fixed in 4.9.1 Patch available CNA
Remediation
- Fix · CNA JSM Show Post Metadata (Unknown) Fixed in 4.9.1
Timeline
- 2026-10-02 Threatist record created from CVE-2026-88997
- 2026-10-03 Alias added: GHSA-w38r-xjmg-mmg7
References
Sources
- CVE-2026-88997 · CVE Program
- CVE-2026-88997 · NVD
- FIRST EPSS
- GHSA-w38r-xjmg-mmg7 · GitHub Advisory Database · CC BY 4.0
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