CVE-2026-16957Public exploitNetwork attack vector

Contributor metadata disclosure via insufficient preview authorization

Published Aug 9, 2026 · Updated Aug 9, 2026

Authorization bypass in eLightUp Slim SEO before 4.9.11 allows remote authenticated users to read arbitrary published-post metadata. The post-meta preview REST routes accept an attacker-chosen post ID and custom-field key but check only whether the post is readable, not whether the requester can edit it. Contributor access and a REST nonce are required; protected and private keys from published posts are exposed, while non-owned draft, private, and trashed posts remain blocked.

CVSS severity2.7
Low
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in eLightUp Slim SEO before 4.9.11 allows remote authenticated users to read arbitrary published-post metadata. The post-meta preview REST routes accept an attacker-chosen post ID and custom-field key but check only whether the post is readable, not whether the requester can edit it. Contributor access and a REST nonce are required; protected and private keys from published posts are exposed, while non-owned draft, private, and trashed posts remain blocked.

The record

CVE
CVE-2026-16957
Published
Aug 9, 2026
Updated
Aug 9, 2026
Vendor
Anh Tran
Product
Slim SEO
Classifications
CWE-639, T1213
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 9, 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 <4.9.11

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Anh Tran · Slim SEOversion=0 <4.9.11

Published CVSS scores

2.7INCIBE-CERTCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-639Authorization Bypass Through User-Controlled Key
T1213Data from Information Repositories

Public exploit references

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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