CVE-2026-88997Network attack vector

Contributor-level stored XSS via unescaped meta keys

Published Sep 23, 2026 · Updated Sep 23, 2026

Stored XSS in Surnia Ulula JSM Show Post Metadata before 4.9.1 allows remote authenticated users to execute JavaScript via crafted meta keys. The plugin's SucomUtil::sanitize_meta_key() leaves quote characters in a post meta key, letting the key break out of an inline event-handler attribute. Contributor-level access is required, and execution occurs only when a higher-privileged user reviews the affected post, exposing the privileged account's session.

CVSS severityUnavailable
Unscored
EPSS probability0.29%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Surnia Ulula JSM Show Post Metadata before 4.9.1 allows remote authenticated users to execute JavaScript via crafted meta keys. The plugin's SucomUtil::sanitize_meta_key() leaves quote characters in a post meta key, letting the key break out of an inline event-handler attribute. Contributor-level access is required, and execution occurs only when a higher-privileged user reviews the affected post, exposing the privileged account's session.

The record

CVE
CVE-2026-88997
Published
Sep 23, 2026
Updated
Sep 23, 2026
Vendor
Surnia Ulula
Product
JSM Show Post Metadata
Classifications
T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <4.9.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Surnia Ulula · JSM Show Post Metadataversion=0 <4.9.1

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1059.007Command and Scripting Interpreter: JavaScript/JScript

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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